Noteikumi par virszemes un pazemes ūdeņu kvalitāti

LEGAL ACTS OF THE REPUBLIC OF LATVIA

LV EN

home

Text consolidated by Valsts valodas centrs (State Language Centre) with amending regulations of:

1 October 2002 [shall come into force from 5 October 2002];
4 October 2005 [shall come into force from 8 October 2005];
7 July 2008 [shall come into force from 12 July 2008];
11 August 2009 [shall come into force from 15 August 2009];
29 September 2009 [shall come into force from 3 October 2009];
22 December 2009 [shall come into force from 1 January 2010];
15 September 2015 [shall come into force from 3 October 2015].

If a whole or part of a paragraph has been amended, the date of the amending regulation appears in square brackets at the end of the paragraph. If a whole paragraph or sub-paragraph has been deleted, the date of the deletion appears in square brackets beside the deleted paragraph or sub-paragraph.

Republic of Latvia

Cabinet
Regulation No. 118
Adopted 12 March 2002

Regulations Regarding the Quality of Surface Waters and Groundwaters

Issued pursuant to
Section 12, Paragraph two of the Law On Pollution

[7 July 2008]

I. General Provisions

1. This Regulation prescribes the quality standards for surface waters and groundwaters.

2. Measures connected with implementation of the requirements of these Regulations shall not directly or indirectly increase water, air or soil pollution.

3. If different water quality standards, specified in these Regulations or in other regulatory enactments, apply to one body of water or watercourse, such quality standards shall be applied that determine more stringent requirements.

II. Water Quality Standards for Surface Waters

4. Water quality standards, which determine the concentration limit values to priority substances (Table 1 of Annex 1) and hazardous substances (Table 2 of Annex 1) in water and concentration limit values to priority substances (Table 3 of Annex 1) in biota, shall apply to all surface waters, including priority fish waters and surface waters to be used for the abstraction of water intended for human consumption.

[11 August 2009]

5. In applying the water quality standards referred to in Tables 1 and 2 of Annex 1 to these Regulations and the quality standards for biota referred to in Table 3 of Annex 1 to these Regulations the following shall be taken into account:

5.1. the intended type of use of the affected territory;

5.2. the necessity to prevent water pollution with the substances especially hazardous to the water environment referred to in Table 1 of Annex 1 to these Regulations and reduce water pollution with other priority substances referred to in Table 1 and the substances referred to in Table 2 of Annex 1 to these Regulations;

5.3. that the environmental quality standards referred to in Table 1 and 2 of Annex 1 to these Regulations are expressed as total concentration of the pollutant or group of substances in the whole water sample;

5.4. that the environmental quality standards for metals refer to the dissolved concentration - the dissolved phase of a water sample obtained by filtration through 0,45 μm filter or any equivalent pre-treatment. When assessing the compliance of water with the environmental quality standards for metals and their compounds, the natural background concentrations for metals may be taken into account, if they prevent compliance with the environmental quality standards, as well as water hardness, dissolved organic carbon, concentration of hydrogen ions (pH value expressed as negative decimal logarithm of concentration of hydrogen ions) or other water quality parameters that affect the bioavailability of metals. The cases when the environmental quality standard applies to the bioavailability concentration of metal are determined in Table 1 of Annex 1 to this Regulation;

5.5. that in respect of those priority substances for which the environmental quality standards are indicated in Table 3 of Annex 1 to this Regulation the quality of surface waters shall be assessed by applying the relevant environmental quality standards for biota. For other substances referred to in Tables 1 and 2 of Annex 1 to this Regulation, the relevant water quality standards shall be applied for the assessment of the quality of surface waters;

5.6. that the quality of surface waters may be assessed by applying the environmental quality standards to priority and hazardous substances in another compartment of the aquatic environment or matrix - water, sediment or biota organisms - or another biota taxon that is a particular aquatic environment taxon which has a sub-phylum, class or equal rank within a taxonomic rank, other than indicated in Sub-paragraph 5.5 of this Regulation and Table 3 of Annex 1 to this Regulation, provided that the requirements laid down in the laws and regulations regarding monitoring of surface waters, groundwaters and protected territories and development of monitoring programmes in respect of the fulfilment of alternative monitoring and performance of testing methods are complied with;

5.7. that in the cases when the environmental quality standards are exceeded in respect of priority or hazardous substances in biota or sediments the monitoring of these substances is concurrently carried out also in water if their measured or estimated concentrations in the environment or emissions of the abovementioned substances indicate to a potential risk of acute exposure on surface waters or risk which could be caused by such waters. The environmental quality standards shall be applied to assessment of the quality of surface waters - the relevant maximum allowable concentrations if such have been determined in Table 1 of Annex 1 to this Regulation.

[11 August 2009; 15 September 2015]

5.¹ The quality of surface waters shall comply with the requirements of these Regulations, if:

5.¹1. for each representative monitoring point within the water body, the arithmetic average value of the concentrations of priority substances and hazardous substances measured at different times during the year does not exceed the annual average concentration specified in Table 1 and 2 of Annex 1 to these Regulations;

5.¹2. the measured one-time concentration of priority substances at any representative monitoring point within the water body does not exceed the maximum allowable concentration specified in Table 1 of Annex 1 to these Regulations;

5.¹3. the concentration of priority substances in biota does not exceed the environmental quality standard specified in Table 3 of Annex 1 to these Regulations.

[11 August 2009]

5.² The calculated mean value of the concentrations referred to in Sub-paragraph 5.¹1 of this Regulation shall not be taken into account in assessment of the quality of surface waters if in monitoring of a particular priority or hazardous substance the concentrations have been determined using the best available analytical method not entailing excessive costs, but the calculated mean value is less than limit of quantification of the used method and the limit of quantification of the applied analytical method is above the environmental quality standard indicated for the relevant priority or hazardous substance in Annex 1 to this Regulation.

[15 September 2015]

6. The Ministry of Environmental Protection and Regional Development shall evaluate the information referred to in Table 2 of Annex 1 to this Regulation and, if necessary, shall supplement it not less than once in four years on the basis of:

6.1. the data regarding the hazardousness of a chemical substance or group of substances to the aquatic environment and human health;

6.2. the results of the risk assessment of chemical substances;

6.3. the amount of the relevant imported, produced and utilised chemical substance, the conditions for use or storage;

6.4. substantiated proposals and expert opinions submitted by natural persons and legal persons.

[4 October 2005; 11 August 2009; 15 September 2015]

7. The Ministry of Environmental Protection and Regional Development shall provide information to the public, the environmental protection and health protection State institutions, as well as other relevant institutions regarding evaluation of the information included in Table 2 of Annex 1 to this Regulation.

[4 October 2005; 11 August 2009; 15 September 2015]

7.¹ If for the achievement of the environmental quality objectives specified in the Water Management Law it is necessary to specify more stringent environmental quality standards for pollutants with especially significant impact on the environment, which have been specified in the Cabinet Regulation No. 294 of 9 July 2002, Procedures by which Polluting Activities of Category A, B and C shall be Declared and Permits for the Performance of Category A and B Polluting Activities shall be Issued, the requirements referred to in Annex 2 to these Regulations shall be applied.

[11 August 2009]

III. Water Quality Standards for Priority Fish Waters

[Chapter shall come into force on 1 January 2003 / See Paragraph 48]

8. Priority fish waters shall be freshwater, in which it is necessary to carry out water protection or water quality improvement measures in order to ensure favourable living conditions for the fish population. The priority fish waters have been specified in Annex 2.¹ to these Regulations.

[1 October 2002; 4 October 2005; 15 September 2015]

9. The conditions of this Chapter shall not apply to natural or artificial ponds that are used for intensive fish farming.

10. Priority fish waters shall be subdivided into:

10.1. salmonid fish waters, in which salmon (Salmo salar), sea trout and brook trout (Salmo trutta), grayling (Thymallus thymallus) and whitefish (Coregonus) live or where it is possible to ensure the existence thereof;

10.2. cyprinid fish waters, in which fish of carp family (Cyprinidae), as well as pike (Perca fluviatilis) and eel (Anguilla anguilla) live or where it is possible to ensure the existence thereof.

11. In order to control the conformity of the quality of priority fish waters with the requirements of this Regulation, water samples shall be taken by complying with the frequency of sampling for monitoring of surface waters laid down in the environmental protection laws and regulations regarding the requirements for monitoring of surface waters, groundwaters and protected territories and development of monitoring programmes. The quality of priority fish waters shall conform to the requirements of this Regulation if all samples comply with the requirements that have been indicated for the parameters referred to in Annex 3 to this Regulation and there are no conditions that would cause harm to the fish population.

[15 September 2015]

12. The samples the nonconformity of which has been caused by floods or other natural disasters, shall not be taken into account when assessing the quality of priority fish waters.

[15 September 2015]

13. The nonconformity of the quality of priority fish waters with the quality standards specified in Annex 3 to these Regulations shall not be in conflict with the requirements of these Regulations, if the nonconformity has been caused by the substances existing in the composition of soil that due to natural reasons get in the waters (hereinafter - natural enrichment of waters).

IV. Water Quality Standards for Bathing Waters

[7 July 2008]

V. Water Quality Standards for Surface Waters to be Used for the Abstraction of Water Intended for Human Consumption

19. The waters of the river Daugava from the water reservoir of Riga HPP to which intensive physical and chemical treatment, intensified treatment and disinfection are applied, are used for abstraction and centralised supply of water intended for human consumption.

[15 September 2015]

20. [15 September 2015]

21. Water quality standards for surface waters to be used for the abstraction of water intended for human consumption have been specified in Annex 6 to these Regulations. Quality standards shall be applied prior to the water treatment.

[15 September 2015]

22. In order to control the conformity of the quality of surface waters to be used for the abstraction of water intended for human consumption with the requirements specified in these Regulations, water samples shall be taken at the same site, observing the frequency of sampling specified in Annex 7 to these Regulations. The quality of surface waters to be used for the abstraction of water intended for human consumption shall conform with the requirements of these Regulations, if:

22.1. 95% of the samples conform with the limit values specified in Annex 7 to these Regulations;

22.2. 90% of the samples conform with the rest of the requirements specified in Annex 7 to these Regulations;

22.3. the remaining samples, which do not conform with the quality standards, differ from them by not more than 50% (this condition does not apply to microbiological parameters, temperature, pH and dissolved oxygen) but does not cause a threat to human health;

22.4. the values of the relevant parameters conform with the quality standards in such water samples that after the determination of a nonconforming sample have been taken with such time interval that ensures the statistical credibility of the data.

[15 September 2015]

23. Samples, the nonconformity of which has been caused by floods or other natural disasters, or abnormal weather conditions, shall not be taken into account when determining the amount of the samples referred to in Paragraph 22 of these Regulations.

24. The nonconformity of the surface waters to be used for the abstraction of water intended for human consumption with the quality standards specified in Annex 6 to these Regulations shall not be in conflict with the requirements of these Regulations, if the nonconformity has been caused by floods, another natural disaster or natural enrichment of waters and, if such nonconformity does not cause a threat to human health.

VI. Water Quality Standards for Groundwaters

[4 October 2005]

25. Water quality standards specified in Annex 9 to these Regulations shall be applied to the groundwater horizons and complexes thereof, the water of which is utilised as water intended for human consumption without any treatment, and in which the average amount of water abstraction exceeds 10 m³ per day, as well as to the groundwater horizons and complexes thereof, the water of which is intended for the utilisation as water intended for human consumption without any treatment. If quality standards of chloride ions, sulphate ions, electric conductivity, iron or permanganic indices have been exceeded due to natural processes, a direct or indirect emission or other activities, which might cause the excess of the values of the relevant parameters in a specific water horizon or complex thereof, shall not be permitted.

[7 July 2008]

26. Water quality standards specified in Table 1 of Annex 10 to these Regulations shall be applied for the assessment of the groundwater status, except for the groundwater horizons and complexes thereof referred to in Paragraph 25 of these Regulations. If the results of the assessment show that:

26.1. the level of pollution has exceeded the arithmetic mean of the guide value and the limit value, measures shall be taken in such relevant territory in order to clarify the limits of the pollution area, to assess whether the pollution does not cause risk to human health and the environment, as well to prevent further pollution of groundwaters;

26.2. the level of pollution has exceeded the limit value, then, taking into account the geological, hydro-geological, hydro-dynamic conditions and the load caused by anthropogenic impact on the relevant territory, the necessity and technical availability of environmental remediation without implementation of such measures which could increase the hazard to human health and the environment shall be assessed, as well as it shall be assessed whether the costs for remediation and control measures of polluted groundwaters are not disproportionately high. The level of groundwater treatment shall be determined individually for each polluted area on the basis of the assessment performed. Remediation shall be carried out in accordance with the Law On Pollution and the Environmental Protection Law.

[11 August 2009]

26.¹ If remediation of groundwaters in the polluted areas is not possible, which are registered in conformity with the requirements specified in the regulatory enactments regarding the exploration and registration of the polluted and potentially polluted area, in accordance with the remediation programme until the limit values specified in Table 1 of Annex 10 to these Regulations, the remediation thereof shall be carried out at least so far that the groundwaters would conform with the requirements specified in Table 2 of Annex 10 to these Regulations.

[11 August 2009]

VII. Water Quality Monitoring

27. The State limited liability company Latvian Environment, Geology and Meteorology Agency (hereinafter - the Centre) shall determine the sampling points, the distance until the closest place of the emission of the pollutants and the depth for the sampling of specially hazardous and hazardous substances and for the monitoring of priority fish waters.

[4 October 2005; 7 July 2008; 11 August 2009]

28. The analyses necessary for the fulfilment of the requirements of these Regulations shall be carried out in an accredited laboratory. When carrying out the analysis of the parameters indicated in Annexes 1, 3, 6, 9, and 10 to this Regulation, the requirements laid down in the laws and regulations regarding monitoring of surface waters, groundwaters and protected territories and development of monitoring programmes in respect of performance of the testing methods of physicochemical and chemical parameters and procedures for quality control and assurance.

[15 September 2015]

29. The operator, which drains specially hazardous or hazardous substances in the surface waters or groundwaters, shall carry out the monitoring of specially hazardous and hazardous substances. The monitoring and control shall be carried out in conformity with Cabinet Regulation No. 34 of 22 January 2002, Regulations regarding Emission of Polluting Substances into Water.

[11 August 2009]

30. The regional environmental board of the State Environmental Service shall gather information about the territories affected by the emission of specially hazardous or hazardous substances. The Centre shall summarise the gathered information and shall control water pollution with specially hazardous or hazardous substances in the affected territories, observing the requirements of Cabinet Regulation No. 34 of 22 January 2002, Regulations regarding Emission of Polluting Substances into Water.

[4 October 2005; 11 August 2009]

31. The Centre shall carry out the monitoring of priority fish waters in conformity with the requirements of Annex 3 to these Regulations.

[4 October 2005; 11 August 2009]

32. If the data of monitoring show that the concentration of oxygen in salmonid fish waters is less than 6 mg/l, but in cyprinid fish waters - less than 4 mg/l, the Centre and the regional environmental boards of the State Environmental Service shall ascertain the reasons for the reduction of the concentration of oxygen and shall take measures in order to prevent harm to the fish population.

[4 October 2005; 11 August 2009]

33. If the data of monitoring show that the quality of priority fish waters is higher than the requirements specified in Annex 6 to these Regulations, the Centre has the right to reduce the sampling frequency. If the Centre determines that specific priority fish waters are not affected by pollution or there are no conditions that might make the quality of these waters worse, it has the right to discontinue the sampling of such waters for two years.

[4 October 2005; 11 August 2009]

34. [7 July 2008].

35. The user of water, who prepares water intended for human consumption and supplies it to consumers, shall carry out the monitoring of the surface waters to be used for the abstraction of water intended for human consumption in conformity with the requirements specified in Annexes 6 and 7 to these Regulations.

[15 September 2015]

36. The samples of the surface water to be used for the abstraction of water intended for human consumption shall be taken at the water supply points prior to the conveying of water to the treatment plants. The containers used for sampling, as well as reagents and methods that are used for the conservation of the parts of a sample, the transportation, storage and conservation of samples shall not affect substantially the results of analyses. The analyses shall be carried out after the filtering of a sample through a wire mesh in order to clear it from floating dust, including pieces of wood and plastic.

37. The frequency of sampling and analyses of the surface waters to be used for the abstraction of water intended for human consumption shall not be less than the minimum frequency per year specified in Annex 7 to these Regulations. The samples shall be taken throughout the year with equal time intervals in order to obtain information regarding the water quality.

38. If the data of monitoring show that the quality of surface water to be used for the abstraction of water intended for human consumption in separate parameters is higher than the requirements specified in Annex 6 to these Regulations, the authority, which determines the frequency of sample taking, has the right to allow the operator to take the relevant samples less often than it has been specified in Annex 7 to these Regulations, taking into account the harmlessness and quality requirements, the procedures for monitoring and control of drinking water specified in regulatory enactment.

[29 September 2009]

39. The user of water, who prepares water intended for human consumption and supplies it to consumers, shall carry out the monitoring of the groundwaters to be used for the abstraction of water intended for human consumption in conformity with the requirements specified in Annex 9 to these Regulations and the conditions of the passport of the water abstraction deposits.

40. [15 September 2015]

VIII. Measures for the Prevention of Pollution

41. If the results of monitoring or other data show that the limit values of the water quality standards have been exceeded, or that the environmental quality objectives specified for the water body cannot be reached within the planed time periods, the Ministry of Environmental Protection and Regional Development shall assign the environmental protection institutions to:

41.1. explore the reasons for the nonconformity;

41.2. review the relevant conditions that have been included in the permit for the performance of polluting activities of Category A or B by reducing the specified limits of emission;

41.3. review the monitoring programmes and make amendments therein;

41.4. carry out other measures that might eliminate a further deterioration of the water quality and promote the improvement thereof.

[4 October 2005; 7 July 2008; 15 September 2015]

42. The Ministry of Environmental Protection and Regional Development shall not assign taking of the measures referred to in Paragraph 41 of this Regulation, if the reasons for nonconformity are force majeure circumstances, including enormous floods or permanent drought, and the requirements regarding temporary exceptions for achievement of environmental quality objectives laid down in the Water Management Law are observed.

[4 October 2005; 11 August 2009; 15 September 2015]

43. [15 September 2015]

IX. Notification

44. In order to provide information to the public and State and local government institutions regarding protection of the aquatic environment, the Centre shall:

44.1. each year prepare a report on the results of monitoring of surface and groundwaters and their assessment, including information regarding fulfilment of the requirements laid down in Paragraph 35 of this Regulation;

44.2. ensure that the information that is provided to the European Commission in accordance with Paragraph 45 of this Regulation is available to the public.

[15 September 2015]

45. In order to inform the European Commission, the Centre shall provide information regarding the surface water and groundwater status, measures for their protection and progress in conformity with the requirements laid down in the environmental protection laws and regulations.

[15 September 2015]

46. [15 September 2015]

47. If the quality standards specified in these Regulations have not been provided or shall not be achieved within the planned time period in the cross-border waters, the regional environmental board of the State Environmental Service shall inform the Environment State Bureau, which in its turn informs the relevant states.

[4 October 2005]

X. Closing Provisions

48. Chapter III, Paragraphs 16, 30, 31, 32, 33 and 34 of these Regulations shall come into force on 1 January 2003.

49. [15 September 2015]

50. [15 September 2015]

51. Until 31 July 2009 the tasks specified for the Centre in these Regulations shall be performed by the State agency "Latvian Environment, Geology and Meteorology Agency".

[11 August 2009]

52. The environmental quality standards shall be applied for the substances referred to in Annex 1, Table 1, Paragraphs 2, 5, 15, 22, 23, and 28 of this Regulation from 22 December 2015 in order to ensure good chemical quality of surface waters in respect of the abovementioned substances until 22 December 2021.

[15 September 2015]

53. The environmental quality standards shall be applied for the substances referred to in Annex 1, Table 1, Paragraphs 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, and 45 of this Regulation from 22 December 2018 in order to prevent deterioration of chemical quality of surface waters in respect of the abovementioned substances and ensure good chemical quality of surface water until 22 December 2027.

[15 September 2015]

Informative Reference to the European Union Directives

[4 October 2005; 7 July 2008; 15 September 2015]

This Regulation contains legal norms arising from:

1) Council Directive 75/440/EEC of 16 June 1975 concerning the quality of surface water intended for the abstraction of drinking water in the Member States;

2) [7 July 2008]

3) [7 July 2008]

4) Directive 2006/44/EC of the European Parliament and of the Council of 6 September 2006 on the quality of fresh waters needing protection or improvement in order to support fish life;

5) [15 September 2015]

6) [15 September 2015]

7) Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000 establishing a framework for Community action in the field of water policy;

8) [15 September 2015]

9) [15 September 2015]

10) 15 September 2015]

11) Directive 2006/11/EC of the European Parliament and of the Council of 15 February 2006 on pollution caused by certain dangerous substances discharged into the aquatic environment of the Community;

12) Directive 2006/118/EC of the European Parliament and of the Council of 12 December 2006 on the protection of groundwater against pollution and deterioration;

13) Directive 2008/105/EC of the European Parliament and of the Council of 16 December 2008 on environmental quality standards in the field of water policy, amending and subsequently repealing Council Directives 82/176/EEC, 83/513/EEC, 84/156/EEC, 84/491/EEC, 86/280/EEC and amending Directive 2000/60/EC of the European Parliament and of the Council;

14) Directive 2013/39/EU of the European Parliament and of the Council of 12 August 2013 amending Directives 2000/60/EC and 2008/105/EC as regards priority substances in the field of water policy.

Prime Minister A. Bērziņš

Minister for Environmental Protection
and Regional Development V. Makarovs

Annex 1
Cabinet Regulation No. 118
12 March 2002

Environmental Quality Standards for Priority Substances and Dangerous Substances, as well as Environmental Quality Standards for Priority Substances in Biota of Surface Waters

[11 August 2009; 15 September 2015]

I. Environmental Quality Standards for Priority Substances in Surface Waters

Table 1

No.	Substance name	CAS number⁽¹⁾	Limit value AAC⁽²⁾ (μg/l)		Limit value MAC⁽⁵⁾ (μg/l)
No.	Substance name	CAS number⁽¹⁾	Inland surface waters⁽³⁾	Other surface waters⁽⁴⁾	Inland surface waters⁽³⁾	Other surface waters⁽⁴⁾
1	2	3	4	5	6	7
1.	Alachlor	15972-60-8	0.3	0.3	0.7	0.7
2.	Anthracene^(X)	120-12-7	0.1	0.1	0.1	0.1
3.	Atrazine	1912-24-9	0.6	0.6	2.0	2.0
4.	Benzene	71-43-2	10	8	50	50
5.	Brominated diphenylether^{(6), (X)}	32534-81-9			0.14	0.14
6.	Cadmium and its compounds^(X) (depending on water hardness classes)⁽⁷⁾	7440-43-9	≤ 0.08 (Level 1) 0.08 (Level 2) 0.09 (Level 3) 0.15 (Level 4) 0.25 (Level 5)	0.2	≤ 0.45 (Level 1) 0.45 (Level 2) 0.6 (Level 3) 0.9 (Level 4) 1.5 (Level 5)	≤ 0.45 (Level 1) 0.45 (Level 2) 0.6 (Level 3) 0.9 (Level 4) 1.5 (Level 5)
7.	C_10-13 Chloralkanes^{(X), (8)}	85535-84-8	0.4	0.4	1.4	1.4
8.	Chlorfenvinphos	470-90-6	0.1	0.1	0.3	0.3
9.	Chlorpyrifos (Chlorpyrifos-ethyl)	2921-88-2	0.03	0.03	0.1	0.1
10.	1,2-Dichloroethane	107-06-2	10	10	not applicable	not applicable
11.	Dichloromethane	75-09-2	20	20	not applicable	not applicable
12.	Di(2-ethylhexyl)-phthalate (DEHP)^(X)	117-81-7	1.3	1.3	not applicable	not applicable
13.	Diuron	330-54-1	0.2	0.2	1.8	1.8
14.	Endosulfan^(X)	115-29-7	0.005	0.0005	0.01	0.004
15.	Fluoranthene	206-44-0	0.0063	0.0063	0.12	0.12
16.	Hexachloro-benzene^(X)	118-74-1			0.05	0.05
17.	Hexachloro-butadiene^(X)	87-68-3			0.6	0.6
18.	Hexachloro-cyclohexane^(X)	608-73-1	0.02	0,002	0.04	0.02
19.	Izoproturon	34123-59-6	0.3	0.3	1.0	1.0
20.	Lead and its compounds	7439-92-1	1.2⁽¹²⁾	1.3	14	14
21.	Mercury and its compounds^(X)	7439-97-6			0.07	0.07
22.	Naphthalene	91-20-3	2	2	130	130
23.	Nickel and its compounds	7440-02-0	4⁽¹²⁾	8.6	34	34
24.	Nonylphenol^(X) (4-Nonylphenol)	84852-15-3	0.3	0.3	2.0	2.0
25.	Octylphenol (4-(1,1',3,3'-tetramethylbutyl)-phenol)	140-66-9	0.1	0.01	not applicable	not applicable
26.	Pentachloro-benzene^(X)	608-93-5	0.007	0.0007	not applicable	not applicable
27.	Penthachloro-phenol	87-86-5	0.4	0.4	1	1
28.	Polyaromatic hydrocarbons (PAH)^{(9) (X)}	not applicable	not applicable	not applicable	not applicable	not applicable
	Benzo(a) pyrene^(X)	50-32-8	1.7 × 10^-4	1.7 × 10^-4	0.27	0.027
	Benzo(b)fluor-anthene^(X)	205-99-2	see note⁽⁹⁾	see note⁽⁹⁾	0.017	0.017
	Benzo(k)fluor-anthene^(X)	207-08-9	see note⁽⁹⁾	see note⁽⁹⁾	0.017	0.017
	Benzo(g,h,i)-perylene^(X)	191-24-2	see note⁽⁹⁾	see note⁽⁹⁾	8.2 × 10^-3	8.2 × 10^-4
	Indeno(1,2,3-cd)-pyrene^(X)	193-39-5	see note⁽⁹⁾	see note⁽⁹⁾	not applicable	not applicable
29.	Simazine	122-34-9	1	1	4	4
30.	Tributyltin compounds^(X) (tributhyltin-cation)	36643-28-4	0.0002	0.0002	0.0015	0.0015
31.	Trichloro-benzenes	12002-48-1	0.4	0.4	not applicable	not applicable
32.	Trichloro-methane (chloroform)	67-66-3	2.5	2.5	not applicable	not applicable
33.	Trifluralin^(X)	08/09/1582	0.03	0.03	not applicable	not applicable
34.	Dicofol^(X)	115-32-2	1.3 × 10^-3	3.2 × 10^-5	not applicable⁽¹⁰⁾	not applicable⁽¹⁰⁾
35.	Perfluorooctane sulfonic acid and its derivatives^(X)	1763-23-1	6.5 × 10^-4	1.3 × 10^-4	36	7.2
36.	Quinoxyfen^(X)	124495-18-7	0.15	0.015	2.7	0.54
37.	Dioxins and dioxin-like compounds^(X)	see note⁽¹¹⁾	-	-	not applicable	not applicable
38.	Aclonifen	74070-46-5	0.12	0.012	0.12	0.012
39.	Bifenox	42576-02-3	0.012	0.0012	0.04	0.004
40.	Cybutryne	28159-98-0	0.0025	0.0025	0.016	0.016
41.	Cypermethrin	52315-07-8⁽¹³⁾	8 × 10^-5	8 × 10^-6	6 × 10^-4	6 × 10^-5
42.	Dichlorvos	62-73-7	6 × 10^-4	6 × 10^-5	7 × 10^-4	7 × 10^-5
43.	Hexabromocyclododecane (HBCDD)^(X)	see note⁽¹⁴⁾	0.0016	0.0008	0.5	0.05
44.	Heptachlor and heptachlor epoxide^(X)	76-44-8/ 1024-57-3	2 × 10^-7	1 × 10^-8	3 × 10^-4	3 × 10^-5
45.	Terbutryn	886-50-0	0.065	0.0065	0.34	0.034

Notes.
1. ⁽¹⁾ Substance number in the register of chemical substances Chemical Abstracts Service.
2. ⁽²⁾ AAC is the annual average concentration - the environmental quality standard (hereinafter - EQS). Unless otherwise specified, AAC applies to the total concentration of all isomers.
3. ⁽³⁾ Inland surface waters encompass all static or flowing surface water, including related artificial or heavily modified water bodies.
4. ⁽⁴⁾ Other surface waters include transitional and coastal waters but in relation to chemical quality - also territorial waters.
5. ⁽⁵⁾ MAC is the maximum allowable concentration - the environmental quality standard. Where the MAC is marked as 'not applicable', the AAC values are considered sufficiently protective against short-term and rapid pollution peaks in continuous discharges since AAC values are significantly lower than the values determined on the basis of acute toxicity.
6. ⁽⁶⁾ For the group of brominated diphenylethers (No. 5), the environmental quality standard refers to the sum of the concentrations of congener No. 28, 47, 99, 100, 153 and 154.
7. ⁽⁷⁾ For cadmium and its compounds (No. 6) the values of the environmental quality standards vary depending on the water hardness (Level 1: < 40 mg CaCO₃/l, Level 2: 40 to < 50 mg CaCO₃/l, Level 3: 50 to < 100 mg CaCO₃/l, Level 4: 100 to < 200 mg CaCO₃/l, Level 5: ≥ 200 mg CaCO₃/l).
8. ⁽⁸⁾ For this group of substances parameters shall be defined through the analytical method.
9. ⁽⁹⁾ For the group of priority substances of polyaromatic hydrocarbons (PAH) (No. 28), AA-EQS in water refer to the concentration of benzo(a)pyrene, as this standard is determined based on the toxicity of the abovementioned substance. Benzo(a)pyrene can be considered as a marker for the other PAHs, hence only benzo(a)pyrene needs to be monitored for comparison with the corresponding AA-EQS in water.
10. ⁽¹⁰⁾ There is insufficient information available to set a MAC.
11. ⁽¹¹⁾ This refers to the following compounds:
7 polychlorinated dibenzo-p-dioxins (PCDDs): 2,3,7,8-T4CDD (CAS No. 1746-01-6), 1,2,3,7,8-P5CDD (CAS No. 40321-76-4), 1,2,3,4,7,8-H6CDD (CAS No. 39227-28-6), 1,2,3,6,7,8-H6CDD (CAS No. 57653-85-7), 1,2,3,7,8,9-H6CDD (CAS No. 19408-74-3), 1,2,3,4,6,7,8-H7CDD (CAS No. 35822-46-9), 1,2,3,4,6,7,8,9-O8CDD (CAS No. 3268-87-9);
10 polychlorinated dibenzofurans (PCDFs): 2,3,7,8-T4CDF (CAS No. 51207-31-9), 1,2,3,7,8-P5CDF (CAS No. 57117-41-6), 2,3,4,7,8-P5CDF (CAS No. 57117-31-4), 1,2,3,4,7,8-H6CDF (CAS No. 70648-26-9), 1,2,3,6,7,8-H6CDF (CAS No. 57117-44-9), 1,2,3,7,8,9-H6CDF (CAS No. 72918-21-9), 2,3,4,6,7,8-H6CDF (CAS No. 60851-34-5), 1,2,3,4,6,7,8-H7CDF (CAS No. 67562-39-4), 1,2,3,4,7,8,9- H7CDF (CAS No. 55673-89-7), 1,2,3,4,6,7,8,9-O8CDF (CAS No. 39001-02-0);
12 dioxin-like polychlorinated biphenyls (PCB-DL): 3,3',4,4'-T4CB (PCB 77, CAS No. 32598-13-3), 3,3',4',5-T4CB (PCB 81, CAS No. 70362-50-4), 2,3,3',4,4'-P5CB (PCB 105, CAS No. 32598-14-4), 2,3,4,4',5-P5CB (PCB 114, CAS No. 74472-37-0), 2,3',4,4',5-P5CB (PCB 118, CAS No. 31508-00-6), 2,3',4,4',5'-P5CB (PCB 123, CAS No. 65510-44-3), 3,3',4,4',5-P5CB (PCB 126, CAS No. 57465-28- 8), 2,3,3',4,4',5-H6CB (PCB 156, CAS No. 38380-08-4), 2,3,3',4,4',5'-H6CB (PCB 157, CAS No. 69782-90-7), 2,3',4,4',5,5'-H6CB (PCB 167, CAS No. 52663-72-6), 3,3',4,4',5,5'-H6CB (PCB 169, CAS No. 32774-16-6), 2,3,3',4,4',5,5'-H7CB (PCB 189, CAS No. 39635-31-9).
12. ⁽¹²⁾ These EQS refer to bioavailable concentrations of the substances. These concentrations are determined using appropriate modelling methods in conformity with the European Commission's Technical Guidance to Implement Bioavailability-based Environmental Quality Standards for Metals.
13. ⁽¹³⁾ CAS No. 52315-07-8 refers to an isomer mixture of cypermethrin, alpha-cypermethrin (CAS No. 67375-30-8), beta-cypermethrin (CAS No. 65731-84-2), theta-cypermethrin (CAS No. 71697-59-1) and zeta-cypermethrin (52315-07-8).
14. ⁽¹⁴⁾ This refers to 1,3,5,7,9,11-Hexabromocyclododecane (CAS No. 25637-99-4), 1,2,5,6,9,10- Hexabromocyclododecane (CAS No. 3194-55-6), α-Hexabromocyclododecane (CAS No. 134237-50-6), β-Hexabromocyclododecane (CAS No. 134237-51-7) and γ- Hexabromocyclododecane (CAS No. 134237-52-8).
15. ^(X) - a substance particularly dangerous to the aquatic environment the emission and release of which is required to be averted until 22 December 2020. It is necessary to avert emissions and release of the substances No. 2, 5 and 28 until 22 December 2021, but of the substances No. 34, 35, 36, 37, 43 and 44 - until 22 December 2027.

II. Environmental Quality Standards for Dangerous Substances in Surface Waters

Table 2

No.	Name of substance	CAS number⁽¹⁾	Limit value AAC⁽²⁾ (μg/l)
No.	Name of substance	CAS number⁽¹⁾	Inland surface waters⁽³⁾	Other surface waters⁽⁴⁾
1	2	3	4	5
1.	Carbon tetrachloride	56-23-5	12	12
2. 2.1. 2.2. 2.3. 2.4.	Cyclodyene-class pesticides: aldrin dieldrin endrine isodrin	. 309-00-2 60-57-1 72-20-8 465-73-6	Σ = 0,01	Σ = 0,005
3.	DDT total ⁽⁵⁾	-	0.025	0.025
	para-para-DDT	50-29-3	0.01	0.01
4.	Trichloroethylene	127-18-4	10	10
5.	Trichloroethylene	79-01-6	10	10
6.	Arsenic and its compounds	7440-38-2	150	36
7.	Zinc and its compounds	7440-66-6	120	81
8.	Chromium and its compounds	7440-47-3	11	50
9.	Copper and its compounds	7440-50-8	9.0	3.1
10.	2.4-dichlorophenoxyacetic acid	94-75-7	10	10
11.	Acrylonitrile	107-13-1	8	8
12.	Diethylamine	109-89-7	100	100
13.	Dimethoate or rogor	epichlorohydrin	1	1
14.	Phenols (index of phenols)	-	5	5
15.	Formaldehyde	50-00-0	1000	1000
16.	2-chloroaniline 3-chloroaniline 4-chloroaniline	95-51-2 108-42-9 106-47-8	10	10
17.	Chlorobenzene	108-90-7	1	1
18.	Polychlorinated biphenyls (PHB)	-	0.01	0.01
19.	2,4,6-trichlorophenol	88-06-2	1	1
20.	Monoaromatic hydrocarbons (toluene, ethylbenzene, xylenes)	-	10	10
21.	Petroleum hydrocarbons (C₁₀-C₄₀ index of hydrocarbons)	-	100	100

III. Environmental Quality Standards for Priority Substances in Biota of Surface Waters⁽¹⁾

Table 3

No.	Name of substance	CAS number⁽²⁾	Limit value⁽³⁾ (μg/kg)
1	2	3	4
1.	Brominated diphenylethers⁽⁴⁾	32534-81-9	0.0085
2.	Fluoranthene	206-44-0	30⁽⁵⁾
3.	Mercury and its compounds	7439-97-6	20
4.	Hexachlorobenzene	118-74-1	10
5.	Hexachlorobutadiene	87-68-3	55
6.	Polyaromatic hydrocarbons (PAH)⁽⁶⁾	not applicable
6.	Benzo(a) pyrene	50-32-8	5⁽⁵⁾
7.	Dicofol	115-32-2	33
8.	Perfluorooctane sulfonic acid and its derivatives (PFOS)	1763-23-1	9.1
9.	Dioxins and dioxin-like compounds	see note⁽⁷⁾	0.0065⁽⁸⁾ TEQ⁽⁹⁾
10.	Hexabromocyclododecanes (HBCDD)	see note⁽¹⁰⁾	167
11.	Heptachlor and heptachlor epoxide	76-44-8/1024-57-3	6.7 × 10^-3

Notes.
1. ⁽¹⁾ Unless otherwise indicated, the environmental quality standard relate to fish. An alternative biota taxon, or another matrix, may be monitored instead, as long as the environmental quality standards applied for the assessment of the chemical quality of waters provide an equivalent level of protection for ecosystems.
2. ⁽²⁾ Substance number in the register of chemical substances Chemical Abstracts Service.
3. ⁽³⁾ Environmental quality standard - permissible concentration in wet mass of soft tissues of indicator organisms of the biota.
4. ⁽⁴⁾ For the group of brominated diphenylethers (No. 1), the environmental quality standard refers to the sum of the concentrations of congener No. 28, 47, 99, 100, 153 and 154.
5. ⁽⁵⁾ The Environmental quality standard refers to crustaceans and molluscs, as the monitoring in fish for the specified substances is not suitable for the assessment of chemical quality of water.
6. ⁽⁶⁾ For the group of priority substances of polyaromatic hydrocarbons (PAH) (No. 6), the environmental quality standard refers to the concentration of benzo(a)pyrene, on the toxicity of which they are based. Benzo(a)pyrene can be considered as a marker for the other PAHs, hence only the concentration of benzo(a)pyrene is determined in biota samples and it is compared with the corresponding quality standard in biota.
7. ⁽⁷⁾ This refers to the following compounds:
7 polychlorinated dibenzo-p-dioxins (PCDDs): 2,3,7,8-T4CDD (CAS No. 1746-01-6), 1,2,3,7,8-P5CDD (CAS No. 40321-76-4), 1,2,3,4,7,8- H6CDD (CAS No. 39227-28-6), 1,2,3,6,7,8-H6CDD (CAS No. 57653-85-7), 1,2,3,7,8,9-H6CDD (CAS No. 19408-74-3), 1,2,3,4,6,7,8-H7CDD (CAS No. 35822-46-9), 1,2,3,4,6,7,8,9-O8CDD (CAS No. 3268-87-9);
10 polychlorinated dibenzofurans (PCDFs): 2,3,7,8-T4CDF (CAS No. 51207-31-9), 1,2,3,7,8-P5CDF (CAS No. 57117-41-6), 2,3,4,7,8-P5CDF (CAS No. 57117-31-4), 1,2,3,4,7,8-H6CDF (CAS No. 70648-26-9), 1,2,3,6,7,8-H6CDF (CAS No. 57117-44-9), 1,2,3,7,8,9-H6CDF (CAS No. 72918-21-9), 2,3,4,6,7,8-H6CDF (CAS No. 60851-34-5), 1,2,3,4,6,7,8-H7CDF (CAS No. 67562-39-4), 1,2,3,4,7,8,9- H7CDF (CAS No. 55673-89-7), 1,2,3,4,6,7,8,9-O8CDF (CAS No. 39001-02-0);
12 dioxin-like polychlorinated biphenyls (PCB-DL): 3,3',4,4'-T4CB (PCB 77, CAS No. 32598-13-3), 3,3',4',5-T4CB (PCB 81, CAS No. 70362-50-4), 2,3,3',4,4'-P5CB (PCB 105, CAS No. 32598-14-4), 2,3,4,4',5-P5CB (PCB 114, CAS No. 74472-37-0), 2,3',4,4',5-P5CB (PCB 118, CAS No. 31508-00-6), 2,3',4,4',5'-P5CB (PCB 123, CAS No. 65510-44-3), 3,3',4,4',5-P5CB (PCB 126, CAS No. 57465-28- 8), 2,3,3',4,4',5-H6CB (PCB 156, CAS No. 38380-08-4), 2,3,3',4,4',5'-H6CB (PCB 157, CAS No. 69782-90-7), 2,3',4,4',5,5'-H6CB (PCB 167, CAS No. 52663-72-6), 3,3',4,4',5,5'-H6CB (PCB 169, CAS No. 32774-16-6), 2,3,3',4,4',5,5'-H7CB (PCB 189, CAS No. 39635-31-9).
8. ⁽⁸⁾ The environmental quality standard relates to fish, crustaceans and molluscs in accordance with Section 5.3 of Annex to Commission Regulation (EU) No 1259/2011of 2 December 2011 amending Regulation (EC) No 1881/2006 as regards maximum levels for dioxins, dioxin-like PCBs and non dioxin-like PCBs in foodstuffs (OJ L 320, 3.12.2011, p. 18).
9. ⁽⁹⁾ The environmental quality standard relates to the sum concentration of the compounds referred to in Note 7: polychlorinated dibenzo-p-dioxins (PCDD), polychlorinated dibenzofurans (PCDF), dioxin-like polychlorinated biphenyls (PCB-DL) which is expressed as toxic equivalents TEQ of these substances in accordance with the World Health Organisation 2005 Toxic Equivalence Factors.
10. ⁽¹⁰⁾ This refers to 1,3,5,7,9,11-Hexabromocyclododecane (CAS No. 25637-99-4), 1,2,5,6,9,10- Hexabromocyclododecane (CAS No. 3194-55-6), α-Hexabromocyclododecane (CAS No. 134237-50-6), β-Hexabromocyclododecane (CAS No. 134237-51-7) and γ- Hexabromocyclododecane (CAS No. 134237-52-8).

Annex 2
Cabinet Regulation No. 118
12 March 2002

Determination of Chemical Quality Standards

[11 August 2009]

1. The quality standards in water, biota and sediments for pollutants with especially significant impact on the environment shall be determined on the basis of research of reaction of aquatic organisms to variable concentration of pollutants.

2. For impact assessment of pollutants the following taxonomic groups of aquatic organisms shall be used:

2.1. algae and (or) macrophytes;

2.2. daphnia or organisms characteristic to salt waters;

2.3. fish.

3. If possible, the data of acute (short-term) and chronic (long-term) exposure of pollutants, which are significant for the water body of relevant type, shall be acquired for the organisms referred to in Paragraph 2 of this Annex, as well as all the available data regarding any other aquatic organisms in a particular water body shall be used.

4. In determining the maximum annual average concentration:

4.1. the relevant safety factors, which in each particular case comply with the nature and quality of available data, technical guidelines regarding risk assessment of new registered substances and risk assessment of existing substances and are in accordance with the following safety factors indicated in the Table, shall be determined:

No.	Type of effects	Safety factor
1.	At least one L(E)C₅₀⁽¹⁾ of acute exposure in each group of organisms	1,000
2.	One NOEC ⁽²⁾ of chronic effects in fish, daphnia or organism characteristic to salt waters)	100
3.	Two NOEC (2) of chronic effects in species which represent two groups of organisms (fish and (or) daphnia or organism characteristic to salt waters)	50
4.	NOEC (2) of chronic effects in at least three species which represent three groups of organisms (usually fish, daphnia or organism characteristic to salt waters and algae)	10
5.	Other cases, including field research data or models of ecosystems which allow to calculate and apply more accurate safety factors	Individual assessment

Notes.
1. ⁽¹⁾ L(E)C₅₀ - lethal concentration which causes death of the organisms used for test after their contact with the toxic substance in 50% of cases.
2. ⁽²⁾ NOEC - harmless concentration of the substance.

4.2. in determining the final value of the environmental quality standard, the data regarding persistence of chemical substances and bioaccumulation, if any, shall be taken into account;

4.3. it shall be taken into account that the environmental quality standard obtained in such way must be compared with any evidence acquired on field research works. If anomalies are observed, the determined standard shall be reviewed in order to calculate more accurate safety factor;

4.4. the environmental quality standard shall be reviewed in accordance with Paragraphs 6 and 7 of these Regulations.

Annex 2.¹
Cabinet Regulation No. 118
12 March 2002

Priority Fish Waters

[11 August 2009]

I. Rivers and Sections of Rivers, which have been Determined as Priority Fish Water

Table 1

No.	Name of the river	County or republic city	Description of the boundaries of the section	Type of waters*
1	2	3	4	5
The river basin district of Daugava
1.	Aiviekste	Rēzekne, Balvi, Rugāji, Lubāna, Madona, Pļaviņas, Krustpils	the entire river	C
2.	Arona	Madona	the entire river	S
3.	Asūnīca	Krāslava, Dagda	from Asūne up to the State border	C
4.	Balupe	Viļaka, Balvi, Rugāji, Lubāna	the entire river	C
5.	Daugava	Krāslava, Daugavpils, the city of Daugavpils, Ilūkste, Līvāni, Jēkabpils, the city of Jēkabpils, Sala, Krustpils, Pļaviņas, Jaunjelgava, Koknese, Aizkraukle, Skrīveri, Lielvārde, Ķegums, Ogre, Ikšķile, Salaspils, Ķekava, Stopiņi, Mārupe, Garkalne, Carnikava, Rīga	from the State border up to the mouth	C
6.	Dubna	Aglona, Daugavpils, Preiļi, Vārkava, Līvāni	the entire river	C
7.	Feimanka	Riebiņi, Preiļi, Vārkava, Līvāni	the entire river	C
8.	Indrica	Krāslava, Dagda	the entire river	C
9.	Jugla	Riga	the entire river	C
10.	Kuja	Madona, Cesvaine	the entire river	S
11.	Līčupe	Amata, Ogre	from Kliģene up to the mouth	S
12.	Lielā Jugla	Mālpils, Ropaži	from the confluence of Studa and Mērgupe up to Zaķumuiža	S
13.	Lielā Jugla	Ropaži, Garkalne	from Zaķumuiža up to (the Lake) Juglas ezers	C
14.	Ludza	Ludza, Cibla, Kārsava	from (the Lake) Lielais Ludzas ezers up to the State border (including the section along the border)	C
15.	Malta	Rēzekne, Viļāni	from Viļāni up to the mouth	C
16.	Mazā Jugla	Ogre, Ikšķile	from Suntaži up to Dobelnieki	S
17.	Mazā Jugla	Ikšķile, Salaspils, Stopiņi	from Dobelnieki up to (the Lake) Juglas ezers	C
18.	Mergupe	Amata, Sigulda, Mālpils	from Nītaure up to the mouth	S
19.	Nereta	Līvāni, Krustpils	from Turki up to the mouth	C
20.	Ogre	Ērgļi, Ogre, Lielvārde, Ķegums	from Ērgļi up to Ogresgals	S
21.	Ogre	Ogre	from Ogresgals up to the mouth	S
22.	Pededze	Alūksne, Gulbene	from the State border up to Litene	S
23.	Pededze	Gulbene, Rugāji, Lubāna	from Litene up to the mouth	C
24.	Pērse	Koknese	from Ūsiņi up to the mouth	C
25.	Rēzekne	Rēzekne	from Sakstagals up to (the Lake) Lubāna ezers	C
26.	Rītupe	Kārsava, Baltinava	from Kārsava-Goliševa road up to the State border (including the section along the border)	C
27.	Saka	Sala, the city of Jēkabpils	the entire river	C
28.	Tartaks	Daugavpils, Aglona	the entire river	C
29.	Tumšupe	Sigulda, Ropaži, Garkalne	from Allažmuiža up to the mouth	S
30.	Veseta	Madona, Pļaviņas, Ērgļi	From Vietava-Vestiena road up to the mouth	S
31.	Ziemeļsusēja	Sala	from Ošāni up to the mouth	C
32.	Zilupe	Zilupe, Ludza, Cibla	from Pasiena up to the State border	C
The river basin district of Gauja
33.	Abuls	Beverīna	from Trikāta up to the mouth	S
34.	Aģe	Limbaži, Saulkrasti	from Mandagas up to the mouth	S
35.	Amata	Amata, Līgatne, Cēsis	from the bridge in Skujene up to the mouth	S
36.	Brasla	Pārgauja, Krimulda	from Straupe up to the mouth	S
37.	Briede	Burtnieki	from the bridge of Valmiera-Matīšu road up to the mouth	C
38.	Egļupe	Inčukalns	the entire river	S
39.	Gauja	Vecpiebalga, Jaunpiebalga, Ranka, Gulbene	from (the Lake) Taurene up to Ranka	C
40.	Gauja	Gulbene, Ape	from Ranka up to Gaujiena	S
41.	Gauja	Ape, Valka, Strenči	from Gaujiena up to Strenči	C
42.	Gauja	Strenči, Beverīna, Burtnieki	from Strenči up to the mouth of (the River) Mellupe	S
43.	Gauja	Beverīna, Burtnieki, Valmiera, Priekuļi, Cēsis, Pārgauja	from the mouth of (the River) Mellupe up to the Cēsis town bridge	C
44.	Gauja	Cēsis, pārgauja, Amata, Līgatne, Krimulda, Sigulda, Inčukalns, Sēja	from the bridge of the town Cēsis up to the Inčukalns Parish bridge	S
45.	Gauja	Inčukalns, Sēja, Ādaži, Carnikava	from the Inčukalns Parish bridge up to the mouth	C
46.	Jaunupe	Salacgrīva	the entire river	S
47.	Korģe	Salacgrīva	from Korģe up to the mouth	S
48.	Kumada	Amata, Līgatne	the entire river	S
49.	Lenčupe	Pārgauja	From Kalna dzirnavas [the Mill of the Mountain] up to the mouth	S
50.	Līgatne	Līgatne, Amata	the entire river	S
51.	Melnupe	Ape, Alūksne	the entire river	C
52.	Pērļupe	Amata	the entire river	S
53.	Pēterupe	Krimulda, Limbaži, Sēja, Saulkrasti	the entire river	S
54.	Rakšupe	Amata	the entire river	S
55.	Rauna	Priekuļi, Rauna	from Rauna up to the mouth	S
56.	Raunis	Cēsis, Priekuļi	the entire river	S
57.	Rauza	Smiltene	from the Jeiska HES up to the mouth	S
58.	Rūja	Rūjiena, Naukšēni, Mazsalaca, Burtnieki	from Rūjiena up to the mouth	C
59.	Salaca	Burtnieki, Mazsalaca	from (the Lake) Burtnieks up to the mouth of (the river) Iģe	C
60.	Salaca	Aloja, Salacgrīva	from the mouth of (the river) Iģe up to the mouth	S
61.	Seda	Burtnieki, Rūjiena	from the bridge of the Rencēnu-Rūjiena road up to the mouth	C
62.	Šepka	Smiltene	from the bridge of the Smiltene-Gulbene road up to the mouth	S
63.	Skaļupe	Līgatne	the entire river	S
64.	Strīķupe	Valmiera, Pārgauja	the entire river	S
65.	Svētupe	Limbaži, Salacgrīva	from Pāle up to the mouth	S
66.	Tirza	Madona, Cesvaine, Gulbene	from the bridge of the Liezere-Druviena road up to the mouth	S
67.	Vaidava	Alūksne, Ape	from the bridge of the Alūksne-Māriņkalns road up to the mouth	S
68.	Vaive	Cēsis, Priekuļi	the entire river	S
69.	Vecpalsa	Smiltene, Ape	the entire river	S
70.	Vija	Valka, Smiltene, Strenči	the entire river	C
71.	Vikmeste	Krimulda, Sigulda	the entire river	S
72.	Vildoga	Līgatne	the entire river	S
73.	Vitrupe	Limbaži, Salacgrīva	from Ķirbiži up to the mouth	S
74.	Vizla	Smiltene, Ape	from Vizla up to the mouth	S
The river basin district of Lielupe
75.	Auce	Tērvete, Dobele, Jelgava	from Kroņauce up to the mouth	C
76.	Bērze	Dobele, Jelgava	from Dobele up to the mouth	C
77.	Dienvidsusēja	Aknīste, Viesīte, Nereta	from Aknīste up to the mouth	C
78.	Iecava	Iecava, Ozolnieki, Jelgava	from Iecava up to the mouth	C
79.	Lielupe	Bauska, Rundāle, Jelgava, the town of Jelgava, Ozolnieki	the entire river	C
80.	Mēmele	Nereta, Vecumnieki, Bauska	the entire river	C
81.	Misa	Ķekava, Olaine, Ozolnieki, Jelgava	from Plakanciems up to the mouth	C
82.	Mūsa	Bauska	from the State border up to the mouth	C
83.	Svēte	Jelgava, the town of Jelgava	from Mūrmuiža up to the mouth	C
84.	Tērvete	Tērvete, Jelgava	from Tērvete up to the mouth	C
85.	Viesīte	Jaunjelgava, Nereta	from the bridge of the Aizkraukle-Nereta road up to the mouth	C
The river basin district of Venta
86.	Abava	Tukums, Kandava, Talsi, Kuldīga	from Pūre up to Renda	C
87.	Abava	Kuldīga, Ventspils	from Renda up to the mouth	S
88.	Amula	Kandava	from Pūce up to the mouth	S
89.	Bārta	Priekule, Rucava, Grobiņa	from the State border up to the bridge of the Bārta-Dunika road	S
90.	Bārta	Rucava, Grobiņa, Nīca	from the bridge of the Bārta-Dunika road up to (the Lake) Liepājas ezers	C
91.	Ciecere	Skrunda, Saldus	from the reservoir Pakuļi up to the mouth	S
92.	Durbe	Durbe, Aizpute, Pāvilosta	the entire river	C
93.	Dursupe	Talsi, Tukums	from (the River) Dursupe up to the mouth	S
94.	Dzedrupe	Talsi	from Dzedri up to the mouth	S
95.	Engure	Ventspils	from (the Lake) Usmas ezers up to (the Lake) Puzes ezers	C
96.	Ēda	Kuldīga	the entire river	S
97.	Imula	Kandava	from Pūce up to the mouth	S
98.	Irbe	Ventspils	the entire river	C
99.	Koja	Skrunda	from the mill of Rudbārži up to the mouth	S
100.	Lāčupīte	Engure	from Cērkste up to the mouth	S
101.	Lētīža	Vaiņode, Skrunda	the entire river	S
102.	Lonaste	Ventspils	from the confluence of (the Rivers) Raķupe and Pāce up to the mouth	S
103.	Melnsilupe	Dundaga, Roja	the entire river	S
104.	Pāce	Dundaga, Ventspils	from Pāce up to the mouth	S
105.	Pilsupe	Dundaga, Roja	the entire river	S
106.	Raķupe	Talsi, Ventspils, Dundaga	from Amele up to the mouth	S
107.	Riežupe	Kuldīga	from the bridge of the Kuldīga-Riga highway up to the mouth	S
108.	Rinda	Ventspils	the entire river	C
109.	Rīva	Kuldīga, Aizpute, Pāvilosta, Jūrkalne	the entire river	S
110.	Roja	Talsi, Roja	from Lube up to the mouth	S
111.	Ruņa	Priekule, Vaiņode	the entire river	S
112.	Saka	Pāvilosta	the entire river	C
113.	Slocene	Engure	from (the lake) Valguma ezers up to (theLake) Kaņiera ezers	C
114.	Stende	Ventspils	from Ance up to the mouth	C
115.	Šķervelis	Skrunda	from Nīkrāce up to Venta	S
116.	Sventāja	Rucava	section of the river along the State border	S
117.	Tebra	Aizpute, Pāvilosta	from Aizpute up to the mouth	S
118.	Užava	Ventspils	from Tērande up to the mouth	S
119.	Venta	Saldus, Skrunda	from the State border up to Skrunda	S
120.	Venta	Kuldīga, Skrunda	from Skrunda up to the bridge of the Kuldīga-Riga highway	C
121.	Venta	Kuldīga	from the bridge of the Kuldīga-Rīga highway up to the bridge of Zlēkas of the Zlēkas Parish	S
122.	Venta	Ventspils, the city of Ventspils	from the bridge of Zlēkas of the Zlēkas Parish up to the mouth	C
123.	Zaņa	Saldus	from Pampāļi up to the mouth	C

Note.
* Type of waters:
C - cyprinid fish waters.
S - salmonid fish waters.

II. Lakes that have been Determined as Priority Fish Water

Table 2

No.	Name of the lake	County or republic city	Type of waters*
1	2	3	4
The river basin district of Daugava
1.	Alauksts	Vecpiebalga	S
2.	Alūksne	Alūksne	S
3.	Ārdavs	Krāslava	S
4.	Bešēni	Aglona	S
5.	Cārmanis	Krāslava	S
6.	Cirišs	Aglona	C
7.	Cirma	Ludza	C
8.	Dagda	Dagda	S
9.	Drīdzis	Krāslava	S
10.	Dubuļi	Aglona	S
11.	Eša (Ežezers)	Dagda	S
12.	Feimaņi	Rēzekne, Riebiņi	C
13.	Galšūns	Dagda	S
14.	Geraņimovas Ildzs	Aglona	S
15.	Inesis	Vecpiebalga	C
16.	Jazinks	Aglona	S
17.	Jugla	Riga	C
18.	Ķīšezers	Riga	C
19.	Laucesa (Smelīne)	Daugavpils	S
20.	Lejas	Krāslava	S
21.	Lielais Baltezers	Garkalne, Ādaži	C
22.	Lielais Gusens	Krāslava	S
23.	Lielais Ludzas	Cibla	C
24.	Lobe	Ogre	C
25.	Lubāns (Lubons)	Madona, Rēzekne	C
26.	Nierza	Ludza	S
27.	Rāzna	Rēzekne	S
28.	Riči	Daugavpils	S
29.	Rušons (Rušiuns)	Rēzekne, Aglona, Riebiņi	C
30.	Sīvers	Krāslava	S
31.	Stirnas	Krāslava	S
32.	Sventes	Daugavpils	S
33.	Tērpes	Krāslava	S
34.	Varnaviči	Krāslava	S
35.	Zosnas	Rēzekne	S
The river basin district of Gauja
36.	Burtnieki	Burtnieki	C
The river basin district of Lielupe
37.	Babīte	Babīte	C
38.	Saukas	Viesīte	C
The river basin district of Venta
39.	Durbe	Durbe	C
40.	Engure	Roja, Engure, Tukums	C
41.	Kaņieris	Engure	C
42.	Liepāja	the city of Liepāja, Grobiņa, Nīca	C
43.	Pape	Rucava	C
44.	Puze	Ventspils	S
45.	Usma	Ventspils	S

Note.
* Type of waters:
C - cyprinid fish waters.
S - salmonid fish waters.

Annex 3
Cabinet Regulation No. 118
12 March 2002

Water Quality Standards for Priority Fish Waters

[15 September 2015]

No.	Parameter/unit of measurement	Salmonid fish waters		Cyprinid fish waters
No.	Parameter/unit of measurement	guideline value	limit value	guideline value	limit value
1	2	3	4	5	6
1.	Ammonium ions (mg/l NH₄^-)	< 0.03	≤ 0.78⁽²⁾	< 0.16	≤ 0.78⁽²⁾
2.	Biochemical oxygen demand (BOD)₅ (mg/l O₂)	< 2		< 4
3.	Zinc ⁽³⁾ (mg/l Zn)		see note⁽¹⁰⁾		see note⁽¹⁰⁾
4.	Phenols (index of phenols) (mg/l C₆H₅OH)		see note⁽¹¹⁾		see note⁽¹¹⁾
5.	Dissolved oxygen (mg/l O₂)	50 % > 9 100 % > 7	50 % > 9	50 % > 8 100 % > 5	50 % > 7
6.	Petroleum hydrocarbons⁽⁵⁾		see note⁽⁴⁾		see note⁽⁴⁾
7.	Non-ionized ammonia (mg/l NH₃)	< 0.005	≤0.025⁽⁶⁾	< 0.005	≤ 0.025⁽⁶⁾
8.	Nitrite ions (mg/l NO₂^-)	≤ 0.01		≤ 0.03
9.	pH (pH units)		6-9^{(1), (7)}		6-9^{(1), (7)}
10.	Suspended solids (mg/l)	≤ 25^{(1), (8)}		≤ 25^{(1), (8)}
11.	Temperature (°C)		see note⁽⁹⁾		see note⁽⁹⁾
12.	Copper⁽³⁾ (mg/l Cu)		see note⁽¹²⁾		see note⁽¹²⁾

Notes.
1. ⁽¹⁾ This standard may be exceeded due to abnormal hydrological or meteorological conditions.
2. ⁽²⁾ The concentration that exceeds this limit value shall not be in conflict with the requirements of this Regulation if it has been caused by abnormal hydrological or meteorological conditions, low water temperature or slowed down nitrification or, if the regional environmental board of the State Environmental Service has received the opinion of the Institute of Food Safety, Animal Health and Environment "BIOR" that such concentration is not harmful for the fish population.
3. ⁽³⁾ The concentration of metal ions in water shall be considered as the concentration of these metals.
4. ⁽⁴⁾ Concentration of petroleum products may not exceed the limit values laid down in Table 1, Paragraph 21 of Annex 1 to this Regulation.
5. ⁽⁵⁾ It shall be determined visually during a sampling whether a pellicle of petroleum products is observed on the water surface, and water samples shall be taken in order to determine the existence of petroleum products.
6. ⁽⁶⁾ This standard shall not be breached, if separate short-term non-ionised ammonium concentration increases have been observed during a day.
7. ⁽⁷⁾ Natural changes of pH values for ±0,5 pH units in priority fish waters shall be permissible in the influence of emissions, if such changes are from pH 6 up to pH 9 and, if they do not intensify the influence of other harmful substances present in the water.
8. ⁽⁸⁾ This average concentration of suspended solids shall not be applicable if the suspended solids contain hazardous chemical substances. A remarkable increase of the concentration of suspended solids shall be permissible during floods.
9. ⁽⁹⁾ The requirements for the temperature of priority fish waters shall be determined, taking into account the following conditions:
1) the temperature of priority fish waters below the place of thermal discharge (measuring at the boundary of the mixing zone) shall not exceed the temperature of the waters unaffected by the discharge for:
1.5^oC - in the salmonid fish waters;
3^oC - in the cyprinid fish waters.
Thermal discharges which cause greater increase in temperature are permissible if the opinion of the Institute of Food Safety, Animal Health and Environment "BIOR" that such increased water temperature does not harmfully influence fish population is obtained;
2) the temperature of priority fish waters below the place of thermal discharge (measuring at the boundary of the mixing zone) shall not exceed:
21.5°C - in the salmonid fish waters⁽¹⁾;
28°C - in the cyprinid fish waters⁽¹⁾;
3) if fish species, to the spawn of which cold water is necessary, populate the priority fish waters, the temperature of such waters, due to the thermal discharge during the periods of spawn, may not exceed:
10°C - in the salmonid fish waters⁽¹⁾;
10°C - in the cyprinid fish waters⁽¹⁾;
4) the determined temperature restrictions may be exceeded not more than in the amount of 2% from the total number of measurements.
10. ⁽¹⁰⁾ The concentration of zinc ions in water may not exceed the limit values laid down in Table 2, Paragraph 7 of Annex 1 to this Regulation.
11. ⁽¹¹⁾ The concentration of phenols in water may not exceed the limit values laid down in Table 2, Paragraph 14 of Annex 1 to this Regulation.
12. ⁽¹²⁾ The concentration of copper ions in water may not exceed the limit values laid down in Table 2, Paragraph 9 of Annex 1 to this Regulation.

Annex 4
Cabinet Regulation No. 118
12 March 2002

Water Quality Standards for Bathing Waters

[7 July 2008]

Annex 5
Cabinet Regulation No. 118
12 March 2002

Surface Waters to be Used for the Abstraction of Water Intended for Human Consumption in Conformity with the Subdivision into Categories

[15 September 2015]

Annex 6
Cabinet Regulation No. 118
12 March 2002

Water Quality Standards for Surface Waters to be Used for the Abstraction of Water Intended for Human Consumption

[15 September 2015]

No.	Parameter⁽¹⁾/unit of measurement	Guideline value	Limit value
1	2	3	4
1.	Aluminium (mg/l)Al)		0.5
2.	Ammonium ions (mg/l NH₄⁺)	2	4⁽²⁾
3.	Antimony (mg/l Sb)		0.005
4.	Arsenic (mg/l As)	0.05	0.1
5.	Barium (mg/l Ba)		1
6.	Benzene (mg/l C₆H₆)		0.002
7.	Biochemical oxygen demand (BOD₅) (20°C, without the performance of nitrification) (mg/l O₂)	< 7
8.	Boron (mg/l B)	1
9.	Cyanide ions (mg/l CN^-)		0.05
10.	Zinc (mg/l Zn)	1	5
11.	Iron (mg/l Fe)	1
12.	Mercury (mg/l Hg)	0.0005	0.001
13.	Electrical conductivity (µS/cm)	1000
14.	Number of faecal coliforms (in 100 millilitres)	20,000
15.	Number of intestinal enterococci (in 100 millilitres)	10 000
16.	Phenols (index of phenols) (mg/l)	0.01	0.1
17.	Fluoride ions⁽³⁾ (mg/l F^-)	0.7-1.7
18.	Phosphate ions (mg/l PO₄^3-)	0.3
19.	Chloride ions (mg/l Cl^-)	200
20.	Dissolved oxygen, saturation % (% O₂)	> 30
21.	Cadmium (mg/l Cd)	0.001	0.005
22.	Total chromium (mg/l Cr)		0.05
23.	total number of coliforms 37 C (in 100 millilitres)	50,000
24.	Total organic carbon (TOC) (mg/l C)
25.	Total pesticides⁽⁴⁾ (mg/l)		0.005
26.	total suspended solids (mg/l)
27.	Colour (after a simple filtration) (Pt/Co scale)	50	200⁽²⁾
28.	Chemical oxygen demand (COD) (mg/l O₂)	30
29.	Manganese (mg/l Mn)	1
30.	Petroleum hydrocarbons (mg/l)	0.5	1
31.	Sodium (mg/l Na)		200
32.	Nickel (mg/l Ni)		0.02
33.	Nitrate ions (mg/l NO₃^-)		50⁽²⁾
34.	Nitrite ions (mg/l NO₂^-)		0.5
35.	Permanganate index (mg/l O₂)		20
36.	Pesticides⁽⁴⁾, ⁽⁵⁾ (mg/l)		0.001
37.	pH (pH units)	5.5-9
38.	Polycyclic aromatic hydrocarbons (PAO)⁽⁶⁾ (mg/l)		0.001
39.	Selenium (mg/l Se)		0.01
40.	Nitrogen, with the Kjeldahl method, except for NO₃- (mg/l N)	3
41.	Smell (threshold of smell 25 C)	20
42.	Sulphate ions (mg/l SO₄^2-)	150	250⁽²⁾
43.	Lead (mg/l Pb)		0.05
44.	Temperature (°C)	22	25⁽²⁾
45.	Tetrachloroethylene (tetrachloroethene) and trichloroethylene (trichloroethane)⁽⁷⁾ (mg/l)		0.001
46.	Copper (mg/l Cu)	1
47.	Surfactants (that react to methylene blue) (mg/l) (Na dodecylbenzosulphonate))	0.5

Notes.
1. ⁽¹⁾The ion concentration these elements in the water shall be considered as the metal concentration.
2. ⁽²⁾ This standard may be exceeded in abnormal meteorological and hydrological conditions.
3. ⁽³⁾ The highest permissible concentration of fluoride ions in high and low average annual temperature.
4. ⁽⁴⁾ Parameter "total pesticides" means the amount of all controlled pesticides. The pesticides shall include organic insecticides, organic herbicides, organic fungicides, organic nematocides, organic agricides, organic rodenticides, organic slimicides, products related with them (including, the growth regulators), as well as the most important metabolites, degradation and reaction products. Only such pesticides shall be determined, the presence of which is possible in the relevant body of water.
5. ⁽⁵⁾ This restriction shall apply to each separate pesticide. The limit value for aldrin, dieldrin, heptachlor and heptachlor epoxide shall be 0.030 µg/l.
6. ⁽⁶⁾ The amount of the concentration of benzo(b)fluoranthrene, benzo(k)fluoranthrene, benzo(g, h, i)perylene, indeno(1, 2, 3-c, d)perylene.
7. ⁽⁷⁾ The limit values shall apply to the totalised concentration of both of the referred to compounds.

Annex 7
Cabinet Regulation No. 118
12 March 2002

Groups of Control Parameters for Surface Waters to be Used for the Abstraction of Water Intended for Human Consumption and Frequency of Sampling

[15 September 2015]

Parameter group I	Parameter group II	Parameter group III
Ammonium ions	Aluminium	Arsenic
Biochemical oxygen demand (BOD)₅)	Zinc	Barium
Electrical conductivity	Iron	Benzene
Phosphate ions	Number of faecal coliforms	Boron
Chloride ions	Index of phenols	Cyanide ions
Dissolved oxygen - saturation	Total number of coliforms	Mercury
Total suspended solids	Manganese	Number of intestinal enterococci
Colour	Nitrogen (determined with the Kjeldahl method)	Fluoride ions
Chemical oxygen demand (COD)	Sulphate ions	Cadmium
Sodium	Copper	Total chromium
Nitrate ions	Surfactants	Petroleum hydrocarbons
Nitrite ions		Nickel
Index of permanganate		Pesticides
pH		Polycyclic aromatic hydrocarbons (PAH)
Smell		Salmonellas
Temperature		Selenium
		Lead
		Tetrachloroethylene and trichloroethylene
Minimum Frequency of Sampling per Year
12 times	4 times	1 time

Annex 8
Cabinet Regulation No. 118
12 March 2002

Testing Methods for Surface Waters to be Used for the Abstraction of Water Intended for Human Consumption

[15 September 2015]

Annex 9
Cabinet Regulation No. 118
12 March 2002

Quality Standards for Groundwaters that are Used for the Abstraction of Water Intended for Human Consumption

[15 September 2015]

No.	Parameter⁽¹⁾	Unit of measurement	Limit values
1	2	3	4
1.	Ammonium ions	mg/l NH₄⁺	0.50
2.	Antimony	µg/l Sb	5.0
3.	Arsenic	µg/l As	10
4.	Benzo(a)pyrene	µg/l	0.010
5.	Benzene	µg/l C₆H₆	1.0
6.	Boron	(mg/l B)	1.0
7.	Cyanide ions	mg/l CN^-	50
8.	Iron	µg/l Fe	200
9.	Mercury	µg/l Hg	1.0
10.	Electrical conductivity	µS/cm h 20 C	2 500
11.	Fluoride ions	(mg/l F^-)	1.5
12.	Chloride ions⁽²⁾	(mg/l Cl^-)	250
13.	Organo-chlorinated solvents⁽³⁾	µg/l	10
14.	Chromium	µg/l Cr	50
15.	Manganese	µg/l Mn	50
16.	Cadmium	µg/l Cd	5.0
17.	Sodium	mg/l Na	200
18.	Nickel	µg/l Ni	20
19.	Nitrate ions⁽⁴⁾	mg/l NO₃^-	50
20.	Nitrite ions	mg/l NO₂^-	0.50
21.	Index of permanganate	mg O₂/l	5.0
22.	Pesticides⁽⁵⁾	µg/l	0.10
23.	Pesticides (total)⁽⁶⁾	µg/l	0.50
24.	pH	pH units	≥ 6.5 and ≤ 9.5
25.	Polycyclic aromatic hydrocarbons (PAH)⁽⁷⁾	µg/l	0.10
26.	Selenium	µg/l Se	10
27.	Sulphate ions	mg/l SO₄^2-	250
28.	Lead	µg/l Pb	10
29.	Copper	mg/l Cu	2.0

Notes.
1. ⁽¹⁾The ion concentration these elements in the water shall be considered as the metal concentration.
2. ⁽²⁾ The water shall not be with a corrosive effect.
3. ⁽³⁾ Organo-chlorinated solvents shall be tetrachloroethylene (tetrachloroethene) and trichloroethylene (trichloroethane). The limit value shall apply to the summed up concentration of both of the referred to substances.
4. ⁽⁴⁾ The following condition shall be fulfilled - (nitrate ion (NO₃^-) concentration mg/l)/50 + (nitrite ion (NO₂^-) concentration mg/l)/3 < 1. The concentration of nitrite ions shall not exceed 0.1 mg/l after the water treatment.
5. ⁽⁵⁾ The limit value shall apply to each separate pesticide. The limit value for aldrin, dieldrin, heptachlor and heptachlor epoxide shall be 0.030 µg/l.
6. ⁽⁶⁾ The pesticides shall characterise organic insecticides, organic herbicides, organic fungicides, organic nematocides, organic agricides, organic rodenticides, organic slimicides, products related with them (including, the growth regulators), as well as the most important metabolites, degradation and reaction products.
7. ⁽⁷⁾ The amount of the concentration of benzo(b)fluoranthrene, benzo(k)fluoranthrene, benzo(g, h, i)perylene, indeno(1, 2, 3-c, d)perylene.

Annex 10
Cabinet Regulation No. 118
12 March 2002

Water Quality Standards for the Assessment of the Status of Groundwaters and Requirements for the Groundwater Treatment in Polluted Areas

[4 October 2005; 7 July 2008; 11 August 2009]

I. Water Quality Standards for the Assessment of the Status of Groundwaters

Table 1

No.	Parameter	Unit of measurement	Guideline value	Limit values
1	2	3	4	5
1.	Chemical oxygen demand (COD)	mg O₂/l	40	300
2.	Total nitrogen (N_kop.)	mg/l	3	50
3.	Synthetic surfactants (SS)	µg/l	-	200
4.	Index of phenols	µg/l	0.5	50
5.	Petroleum hydrocarbons (C₁₀-C₄₀ index of hydrocarbons)	µg/l	-	1000
6.	Benzene	µg/l	0.2	5
7.	Ethylbenzene	µg/l	0.5	60
8.	Toluene	µg/l	0.5	50
9.	Xylenes	µg/l	0.5	60
10.	Copper (Cu)	µg/l	10	75
11.	Lead (Pb)	µg/l	10	75
12.	Cadmium (Cd)	µg/l	1.0	6
13.	Mercury (Hg)	µg/l	0.05	0.3
14.	Chromium (Cr)	µg/l	10	30
15.	Cobalt (Co)	µg/l	10	100
16.	Nickel (Ni)	µg/l	10	75
17.	Arsenic (As)	µg/l	10	60
18.	Molybdenum (Mo)	µg/l	10	300

II. Requirements for Water Treatment in Polluted Areas

Table 2

No.	Parameter	Minimum reduction of pollution (%)
1.	summary parameters characterising pollution
1.1.	biochemical oxygen demand (BOD)₅)	70-90
1.2.	chemical oxygen demand (COD)	75
1.3.	Total nitrogen (N_kop.)	80
1.4.	total phosphorus (P_kop.)	70-80
1.5.	synthetic surfactants (SS)	80
2.	specific pollutants	60-70

Document information

Title: Status:

in force Issuer: Cabinet of Ministers Type: Document number: 118Adoption: 12.03.2002.Entry into force: Publication: Latvijas Vēstnesis, 50, 03.04.2002.

Language:

Pieņemts		Stājas spēkā		Dokumenta Nr.
	līdz		līdz

Publicēts LV		Zaudējis spēku		Redakcija uz
	līdz		līdz

Izdevējs		Veids