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The Water Supply (Water Quality) Regulations 2016

Type Statutory-Instrument
Publication 2016-05-26
Last updated 2020-12-31
State In force
Department King's Printer of Acts of Parliament
Source legislation.gov.uk
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Publicity for authorisations

24

Revocation and variation of authorisations

25

PART 8 — Water treatment

Disinfection and other treatment arrangements

26

Risk assessment

27

Procedure following risk assessment and prohibition of supply

28

Water treatment to minimise contamination from pipes

29

Replacement of lead pipes

30

Application and introduction of substances and products

31

may be applied or introduced, notwithstanding that none of the requirements of paragraph (4) is satisfied.

Use of processes

32

Offences

33

is guilty of an offence and liable on summary conviction, or on conviction on indictment, to a fine.

PART 9 — Records and information

Maintenance of records

34

Provision of information

35

PART 10 — Functions of local authorities in relation to water quality

Application and interpretation of this Part

36

Duties of local authorities: supplementary provision

37

PART 11 — Enforcement

Contraventions by relevant suppliers

38

Any duty or requirement imposed by Parts 4 to 9 of these Regulations on a relevant supplier is enforceable under section 18 of the Act by the Secretary of State or the Authority , whether or not it constitutes an offence.

PART 12 — Review

Review

39

PART 13 — Amendments and revocations

Amendments and revocations

40

SCHEDULE 1 — Prescribed concentrations and values

(1) (2) (3) (4) (5)
Item Parameters Concentration or value (maximum) Units of measurement Point of compliance
1. Enterococci 0 number/100ml Consumers' taps
2. Escherichia coli 0 number/100ml Consumers' taps
(E. coli)
¹ Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). ¹ Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). ¹ Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). ¹ Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). ¹ Compliance required as to 95% of samples from each service reservoir (regulation 4(6)).
--- --- --- --- ---
(1) (2) (3) (4) (5)
Item Parameters Concentration or value (maximum) Units of measurement Point of compliance
1. Coliform bacteria 0 number/100ml Service reservoirs¹ and water treatment works
2. Escherichia coli (E. coli) 0 number/100ml Service reservoirs and water treatment works
¹ The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. ¹ The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. ¹ The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. ¹ The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. ¹ The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification.
--- --- --- --- ---
² See also regulation 4(2)(d). ² See also regulation 4(2)(d). ² See also regulation 4(2)(d). ² See also regulation 4(2)(d). ² See also regulation 4(2)(d).
³ See the definition of “pesticides and related products” in regulation 2. ³ See the definition of “pesticides and related products” in regulation 2. ³ See the definition of “pesticides and related products” in regulation 2. ³ See the definition of “pesticides and related products” in regulation 2. ³ See the definition of “pesticides and related products” in regulation 2.
⁴ The parametric value applies to each individual pesticide. ⁴ The parametric value applies to each individual pesticide. ⁴ The parametric value applies to each individual pesticide. ⁴ The parametric value applies to each individual pesticide. ⁴ The parametric value applies to each individual pesticide.
⁵ “Pesticides: total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. ⁵ “Pesticides: total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. ⁵ “Pesticides: total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. ⁵ “Pesticides: total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. ⁵ “Pesticides: total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.
⁶ The specified compounds are—The specified compounds are— — benzo(b)fluoranthen; — benzo(k)fluoranthene; — benzo(ghi)perylene; — indeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. ⁶ The specified compounds are—The specified compounds are— — benzo(b)fluoranthen; — benzo(k)fluoranthene; — benzo(ghi)perylene; — indeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. ⁶ The specified compounds are—The specified compounds are— — benzo(b)fluoranthen; — benzo(k)fluoranthene; — benzo(ghi)perylene; — indeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. ⁶ The specified compounds are—The specified compounds are— — benzo(b)fluoranthen; — benzo(k)fluoranthene; — benzo(ghi)perylene; — indeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. ⁶ The specified compounds are—The specified compounds are— — benzo(b)fluoranthen; — benzo(k)fluoranthene; — benzo(ghi)perylene; — indeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
⁷ The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. ⁷ The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. ⁷ The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. ⁷ The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. ⁷ The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
⁸ The specified compounds are—The specified compounds are— — chloroform; — bromoform; — dibromochloromethane; — bromodichloromethaneThe parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. ⁸ The specified compounds are—The specified compounds are— — chloroform; — bromoform; — dibromochloromethane; — bromodichloromethaneThe parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. ⁸ The specified compounds are—The specified compounds are— — chloroform; — bromoform; — dibromochloromethane; — bromodichloromethaneThe parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. ⁸ The specified compounds are—The specified compounds are— — chloroform; — bromoform; — dibromochloromethane; — bromodichloromethaneThe parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. ⁸ The specified compounds are—The specified compounds are— — chloroform; — bromoform; — dibromochloromethane; — bromodichloromethaneThe parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
(1) (2) (3) (4) (5)
Item Parameters Concentration or value (maximum) Units of measurement Point of compliance
1. Acrylamide 0.10 µg/1 ¹
2. Antimony 5.0 µgSb/1 Consumers' taps
3. Arsenic 10 µgAs/1 Consumers' taps
4. Benzene 1.0 µg/1 Consumers' taps
5. Benzo(a)pyrene 0.010 µg/1 Consumers' taps
6. Boron 1.0 mgB/1 Consumers' taps
7. Bromate 10 µgBrO3/1 Consumers' taps
8. Cadmium 5.0 µgCd/1 Consumers' taps
9. Chromium 50 µgCr/1 Consumers' taps
10. Copper 2.0 mgCu/1 Consumers' taps
11. Cyanide 50 µgCN/1 Consumers' taps
12. 1, 2 dichloroethane 3.0 µg/1 Consumers' taps
13. Epichlorohydrin 0.10 µg/1 ¹
14. Fluoride 1.5 mgF/1 Consumers' taps
15. Lead 10 µgPb/1 Consumers' taps
16. Mercury 1.0 µgHg/1 Consumers' taps
17. Nickel 20 µgNi/1 Consumers' taps
18. Nitrate² 50 mgNO3/1 Consumers' taps
19. Nitrite² 0.50 mgNO2/1 Consumers' taps
0.10 Treatment works
20. Pesticides³⁴ 0.030 µg/1 Consumers' taps
Aldrin
Dieldrin 0.030 µg1 Consumer's taps
Heptachlor
Heptachlor epoxide
Other pesticides 0.10 μg/l Consumers' taps
21. Pesticides: total⁵ 0.50 µg/1 Consumers' taps
22. Polycyclic aromatic hydrocarbon⁶ 0.10 µg/1 Consumers' taps
23. Selenium 10 µgSe/1 Consumers' taps
24. Tetrachloroethene and Trichloroethene⁷ 10 μg/l Consumers' taps
25. Trihalomethanes: Total⁸ 100 µg/1 Consumers' taps
26. Vinyl chloride 0.50 µg/1 ¹
(1) (2) (3) (4) (5)
--- --- --- --- ---
Item Parameters Concentration or value (maximum) Units of measurement Point of compliance
1. Aluminium 200 µgA1/1 Consumers' taps
2. Colour 20 mg/1 Pt/Co Consumers' taps
3. Iron 200 µgFe/1 Consumers' taps
4. Manganese 50 µgMn/1 Consumers' taps
5. Odour Acceptable to consumers and no abnormal change Consumers' taps
6. Sodium 200 mgNa/1 Consumers' taps
7. Taste Acceptable to consumers and no abnormal change Consumers' taps
8. Tetrachloromethane 3 µg/1 Consumers' taps
9. Turbidity 4 NTU Consumers' taps

SCHEDULE 2 — Indicator parameters

(1) (2) (3) (4) (5)
Item Parameters Specification concentration or value (maximum unless otherwise stated) or state Units of measurement Point of compliance
(i) The water should not be aggressive. (i) The water should not be aggressive. (i) The water should not be aggressive. (i) The water should not be aggressive. (i) The water should not be aggressive.
(ii) Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. (ii) Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. (ii) Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. (ii) Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. (ii) Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment.
(iii) Remedial action may be taken by the Secretary of State on radiological protection grounds without further consideration and deemed to be justified where radon concentrates exceed 1,000 Bq/1. (iii) Remedial action may be taken by the Secretary of State on radiological protection grounds without further consideration and deemed to be justified where radon concentrates exceed 1,000 Bq/1. (iii) Remedial action may be taken by the Secretary of State on radiological protection grounds without further consideration and deemed to be justified where radon concentrates exceed 1,000 Bq/1. (iii) Remedial action may be taken by the Secretary of State on radiological protection grounds without further consideration and deemed to be justified where radon concentrates exceed 1,000 Bq/1. (iii) Remedial action may be taken by the Secretary of State on radiological protection grounds without further consideration and deemed to be justified where radon concentrates exceed 1,000 Bq/1.
(iv) If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides is required. (iv) If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides is required. (iv) If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides is required. (iv) If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides is required. (iv) If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides is required.
(*) May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. (*) May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. (*) May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. (*) May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. (*) May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.
1. Ammonium 0.50 mgNH4/1 Consumers’ taps
2. Chloride[^f01009] 250 mgC1/ Supply point[^f01013]
3. Clostridium 0 Number/100ml Supply point[^f01013]
Perfringens (including spores)
4. Coliform bacteria 0 Number/100ml Consumers’ taps
5. Colony counts No abnormal change Number/1ml at 22°C Consumers’ taps, service reservoirs and treatment works
6. Conductivity[^f01009] 2500 μS/cm at 20°C Supply point[^f01013]
7. Hydrogen ion 9.5 (maximum) 6.5 (minimum) pH value Consumers’ taps
8. Indicative dose[^f01010] 0.10 mSv Supply point[^f01013]
(a) gross alpha 0.1 Bq/1 Supply point[^f01013]
(b) gross beta 1 Bq/1 Supply point[^f01013]
9. Radon[^f01011] 100 Bq/1 Supply point
10. Sulphate[^f01009] 250 mgSO4/l Supply point[^f01013]
11. Total organic carbon (TOC) No abnormal change mgC/l Supply point
12. Tritium (for radioactivity)[^f01012] 100 Bq/l Supply point[^f01013]
13. Turbidity 1 NTU Treatment works

SCHEDULE 3 — Monitoring

(1) (2) (3)
Item Parameter Circumstances
1. Aluminium When used as flocculant or where the water originates from, or is influenced by, surface waters
2. Ammonium
3. Clostridium perfringens (including spores) Where the water originates from, or is influenced by, surface waters
4. Coliform bacteria
5. Colony counts
6. Colour
7. Conductivity
8. Escherichia coli (E. coli)
9. Hydrogen ion
10. Iron When used as flocculant or where the water originates from, or is influenced by, surface waters
11. Manganese Where the water originates from, or is influenced by, surface waters
12. Nitrate When chloramination is practised
13. Nitrite When chloramination is practised
14. Odour
15. Taste
16. Turbidity
¹ Where the population is not an exact multiple of 5,000, the population figure must be rounded up to the nearest multiple of 5,000. ¹ Where the population is not an exact multiple of 5,000, the population figure must be rounded up to the nearest multiple of 5,000. ¹ Where the population is not an exact multiple of 5,000, the population figure must be rounded up to the nearest multiple of 5,000.
--- --- ---
² Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to footnotes (iii) and (iv) below. ² Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to footnotes (iii) and (iv) below. ² Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to footnotes (iii) and (iv) below.
³ Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required. ³ Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required. ³ Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required.
⁴ Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points. ⁴ Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points. ⁴ Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points.
⁵ To monitor for indicative dose. ⁵ To monitor for indicative dose. ⁵ To monitor for indicative dose.
⁶ In the event that a single sample is taken in a year, a further sample should be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply. ⁶ In the event that a single sample is taken in a year, a further sample should be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply. ⁶ In the event that a single sample is taken in a year, a further sample should be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply.
(1) (1) (2)
Substances and parameters subject to monitoring Substances and parameters subject to monitoring Estimated population of water supply zone
Subject to check monitoring Subject to check monitoring Subject to check monitoring
E. coli <100 <100
Coliform bacteria ≥100 ≥100
Residual disinfectant
Aluminium <100 <100
Ammonium 100-4,999 100-4,999
Clostridium perfringens 5,000-9,999 5,000-9,999
(including spores) 10,000-29,999 10,000-29,999
Colony counts 30,000-49,999 30,000-49,999
Colour 50,000-79,999 50,000-79,999
Conductivity² 80,000-100,000 80,000-100,000
Hydrogen ion
Iron
Manganese
Nitrate³
Nitrite
Odour
Taste
Turbidity
Subject to audit monitoring Subject to audit monitoring Subject to audit monitoring
Aluminium <100 <100
Antimony 100-4,999 100-4,999
Arsenic 5,000-100,000 5,000-100,000
Benzene²
Benzo(a)pyrene
Boron²
Bromate⁴
Cadmium
Chromium
Clostridium perfringens
(including spores)
Copper
Cyanide²
1,2 dichloroethane²
Enterococci
Fluoride²
Gross alpha²⁵⁶
Gross beta²⁵⁶
Iron
Lead
Manganese
Mercury²
Nickel
Nitrate³
Nitrite³
Pesticides and related products²
Polycyclic aromatic hydrocarbons
Radon²⁶
Selenium
Sodium
Trichloroethene
Tetrachloroethene²
Tetrachloromethane²
Trihalomethanes
Chloride²
Sulphate²
Total organic carbon²
Tritium²⁶
¹ Sampling is at treatment works when chloramination is practised. ¹ Sampling is at treatment works when chloramination is practised. ¹ Sampling is at treatment works when chloramination is practised.
--- --- ---
² Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3). ² Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3). ² Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3).
³ Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones. ³ Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones. ³ Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones.
⁴ Sampling at treatment works when chloramination is not practised. ⁴ Sampling at treatment works when chloramination is not practised. ⁴ Sampling at treatment works when chloramination is not practised.
⁵ To monitor for indicative dose. ⁵ To monitor for indicative dose. ⁵ To monitor for indicative dose.
(1) (2) (3)
Item Substances and parameters Volume of water supplied m³/d
1. E. coli <20
2. Coliform bacteria 20–1,999
3. Colony counts 2,000–5,999
4. Nitrite¹ 6,000–11,999
5. Residual disinfectant ≥12,000
6. Turbidity
Subject to check monitoring Subject to check monitoring Subject to check monitoring
7. Clostridium perfringens ² <20
8. Conductivity 20–999
1,000–1,999
2,000-5,999
6,000-9,999
10,000-15,999
16,000-32,999
33,000-49,999
50,000-67,999
68,000-84,999
85,000-101,999
102,000-119,999
120,000-241,999
242,000–484,999
485,000–728,999
Subject to audit monitoring Subject to audit monitoring Subject to audit monitoring
9. Benzene <20
10. Boron 20–999
11. Bromate³ 1,000–49,999
12. Clostridium 50,000–89,999
Perfringens (including spores) 90,000–299,999
13. Cyanide 300,000–649,999
14. 1,2 dichloroethane ≥650,000
15. Fluoride
16. Indicative dose
17. Mercury
18. Nitrite⁴
19. Pesticides and related products
20. Radon
21. Trichloroethene/
Tetrachloroethene
22. Tetrachloromethane
23. Chloride
24. Sulphate
25. Total organic carbon
26. Tritium
27. Gross alpha⁵
28. Gross beta⁵

SCHEDULE 4 — Monitoring for indicative dose and analytical performance characteristics

Monitoring for compliance with the ID

1

Screening for certain radionuclides or for an individual radionuclide

2

Screening strategies for gross alpha activity and gross beta activity

3

Calculation of the ID

4

$$Σ i = 1 n C i (obs) C i (der) ≤ 1$where—“Ci(obs)” means observed concentration of radionuclide I;“Ci(der)” means derived concentration of radionuclide i;“n” means number of radionuclides detected.$

¹ This Table allows only for the radiological properties of uranium, not for its chemical toxicity. ¹ This Table allows only for the radiological properties of uranium, not for its chemical toxicity. ¹ This Table allows only for the radiological properties of uranium, not for its chemical toxicity.
(1) (2) (3)
Origin Nuclide Derived concentration
Natural: U-238¹ 3.0 Bq/1
U-234¹ 2.8 Bq/1
Ra-226 0.5 Bq/1
Ra-228 0.2 Bq/1
Pb-210 0.2 Bq/1
Po-210 0.1 Bq/1
Artificial: C-14 240 Bq/1
Sr-90 4.9 Bq/1
Pu-239/Pu-240 0.6 Bq/1
Am-241 0.7 Bq/1
Co-60 40 Bq/1
Cs-134 7.2 Bq/1
Cs-137 11 Bq/1
1-131 6.2 Bq/1
(1) (2) (3)
--- --- ---
Parameters and radionuclides Limit of detection (Notes 1, 2) Notes
Tritium 10 Bq/1 Note 3
Radon 10 Bq/1 Note 3
gross alpha activity 0.04 Bq/1 Note 4
gross beta activity 0.4 Bq/1 Note 4
U-238 0.02 Bq/1
U-234 0.02 Bq/1
Ra-226 0.04 Bq/1
Ra-228 0.02 Bq/1 Note 5
Pb-210 0.02 Bq/1
Po-210 0.01 Bq/1
C-14 20 Bq/1
Sr-90 0.4 Bq/1
Pu-239/Pu-240 0.04 Bq/1
Am-241 0.06 Bq/1
Co-60 0.5 Bq/1
Cs-134 0.5 Bq/1
Cs-137 0.5 Bq/1
I-131 0.5 Bq/1

SCHEDULE 5 — Analytical methodology

(1) Parameter (2) Method of analysis
E. coli and coliform bacteria EN ISO 9308-1 or EN ISO 9308-2
Enterococci EN ISO 7899-2
Pseudomonas aeruginosa EN ISO 16266
Enumeration of culturable microorganisms – colony count 22°c EN ISO 6222
Enumeration of culturable microorganisms – colony count 36°c EN ISO 6222
Clostridium perfringens (including spores) EN ISO 14189
¹ The method of analysis must determine total cyanide in all forms. ¹ The method of analysis must determine total cyanide in all forms.
--- ---
² The performance characteristics apply to each individual pesticide and depends on the pesticide concerned. ² The performance characteristics apply to each individual pesticide and depends on the pesticide concerned.
³ The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1. ³ The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1.
⁴ The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1. ⁴ The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1.
⁵ The performance characteristics apply to the prescribed value of 4 NTU. ⁵ The performance characteristics apply to the prescribed value of 4 NTU.
⁶ The performance characteristics apply to the specification of 1 NTU for water leaving treatment works. ⁶ The performance characteristics apply to the specification of 1 NTU for water leaving treatment works.
(1) (2)
Parameters Trueness % of prescribed concentration or value or specification
Aluminium 10
Ammonium 10
Antimony 25
Arsenic 10
Benzene 25
Benzo(a)pyrene 25
Boron 10
Bromate 25
Cadmium 10
Chloride 10
Chromium 10
Colour 10
Conductivity 10
Copper 10
Cyanide¹ 10
1,2-dichloroethane 25
Fluoride 10
Iron 10
Lead 10
Manganese 10
Mercury 20
Nickel 10
Nitrate 10
Nitrite 10
Pesticides and related products² 25
Polycyclic aromatic hydrocarbons³ 25
Selenium 10
Sodium 10
Sulphate 10
Tetrachloroethene⁴ 25
Tetrachloromethane 20
Trichloroethene⁴ 25
Trihalomethanes: 25
Total³
Turbidity⁵ 10
Turbidity⁶ 25

SCHEDULE 6 — Amendments

(1) (2) (3) (4)
Regulations to be amended References Provisions to be amended Amendments to be made
The Legislative and Regulatory Reform (Regulatory Functions) Order 200731 S.I. 2007/3544 Part 2 of the Schedule, under the heading “Water” For “Water Supply (Water Quality) Regulations 2000” substitute “Water Supply (Water Quality) Regulations 2016”
The Water Quality and Supply (Fees) Order 2016 S.I. 2016/303 The Schedule For “Water Supply (Water Quality) Regulations 2000” substitute “Water Supply (Water Quality) Regulations 2016”

SCHEDULE 7 — Revocations

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