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The Water Supply (Water Quality) Regulations (Northern Ireland) 2017

Type Ni-Statutory-Rule
Publication 2017-10-06
Last updated 2020-12-31
State In force
Jurisdiction Northern Ireland
Department Government Printer for Northern Ireland
Source legislation.gov.uk
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PART 12 — TRANSITIONAL PROVISIONS

Transitional Provisions

40

SCHEDULE 1 — PRESCRIBED CONCENTRATIONS AND VALUES

Wholesomeness

¹ Where water is supplied from a tanker see regulation 5(3)(a) ¹ Where water is supplied from a tanker see regulation 5(3)(a) ¹ Where water is supplied from a tanker see regulation 5(3)(a) ¹ Where water is supplied from a tanker see regulation 5(3)(a) ¹ Where water is supplied from a tanker see regulation 5(3)(a)
² Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 5(6)). ² Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 5(6)). ² Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 5(6)). ² Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 5(6)). ² Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 5(6)).
(1) Item (2) Parameters (3) Concentration or Value (maximum) (4) Unit of measurement (5) Point of Compliance¹
Part I: Directive requirements Part I: Directive requirements Part I: Directive requirements Part I: Directive requirements Part I: Directive requirements
1. Enterococci 0 number/100ml Consumers' taps
2. Escherichia coli (E. coli) 0 number/100ml Consumers' taps
Part II: National requirements Part II: National requirements Part II: National requirements Part II: National requirements Part II: National requirements
1. Coliform bacteria 0 number/100ml Service reservoirs² and water treatment works
2. Escherichia coli (E. coli) 0 number/100ml Service reservoirs and water treatment works
(1) Item (2) Parameters (3) Concentration or Value (maximum) (5) Units of Measurement (6) Point of compliance
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(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) Where possible, without compromising disinfection, a water undertaker (in relation to a supply of water for human consumption purposes) must strive for a lower value. (2) Where possible, without compromising disinfection, a water undertaker (in relation to a supply of water for human consumption purposes) must strive for a lower value. (2) Where possible, without compromising disinfection, a water undertaker (in relation to a supply of water for human consumption purposes) must strive for a lower value. (2) Where possible, without compromising disinfection, a water undertaker (in relation to a supply of water for human consumption purposes) must strive for a lower value. (2) Where possible, without compromising disinfection, a water undertaker (in relation to a supply of water for human consumption purposes) must strive for a lower value.
(3) See also regulation 8(5). (3) See also regulation 8(5). (3) See also regulation 8(5). (3) See also regulation 8(5). (3) See also regulation 8(5).
(4) See also regulation 5(3)(d). (4) See also regulation 5(3)(d). (4) See also regulation 5(3)(d). (4) See also regulation 5(3)(d). (4) See also regulation 5(3)(d).
(5) See the definition of “pesticides and related products” in regulation 2. (5) See the definition of “pesticides and related products” in regulation 2. (5) See the definition of “pesticides and related products” in regulation 2. (5) See the definition of “pesticides and related products” in regulation 2. (5) See the definition of “pesticides and related products” in regulation 2.
(6) The parametric value applies to each individual. “other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide. (6) The parametric value applies to each individual. “other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide. (6) The parametric value applies to each individual. “other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide. (6) The parametric value applies to each individual. “other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide. (6) The parametric value applies to each individual. “other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide.
(7) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process. (7) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process. (7) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process. (7) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process. (7) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.
(8) The specified compounds are benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene and 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 benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene and 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 benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene and 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 benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene and 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 benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
(9) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. (9) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. (9) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. (9) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. (9) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
(10) The specified compounds are chloroform, bromoform, dibromochloromethane, bromodichloromethane and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. (10) The specified compounds are chloroform, bromoform, dibromochloromethane, bromodichloromethane and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. (10) The specified compounds are chloroform, bromoform, dibromochloromethane, bromodichloromethane and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. (10) The specified compounds are chloroform, bromoform, dibromochloromethane, bromodichloromethane and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. (10) The specified compounds are chloroform, bromoform, dibromochloromethane, bromodichloromethane and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
Part I: Directive requirements Part I: Directive requirements Part I: Directive requirements Part I: Directive requirements Part I: Directive requirements
1. Acrylamide[^f01002] 0.10 µg/l
2. Antimony 5.0 µg/l Consumers’ taps
3. Arsenic 10 µg/l Consumers’ taps
4 Benzene 1.0 µg/l Consumers’ taps
5 Benzo(a)pyrene 0.010 µg/l Consumers’ taps
6 Boron 1.0 mg/l Consumers’ taps
7 Bromate[^f01003] 10 µg/l Consumers’ taps
8 Cadmium 5.0 µg/l Consumers’ taps
9 Chromium 50 µg/l Consumers’ taps
10 Copper[^f01004] 2.0 mg/l Consumers’ taps
11 Cyanide 50 µg/l Consumers’ taps
12 1, 2 dichloroethane 3.0 µg/l Consumers’ taps
13 Epichlorohydrin[^f01002] 0.10 µg/l
14 Fluoride 1.5 mg/l Consumers’ taps
15 Lead[^f01004] 10 µg/l Consumers’ taps
16 Mercury 1.0 µg/l Consumers’ taps
17 Nickel[^f01004] 20 µg/l Consumers’ taps
18 Nitrate[^f01005] 50 mg/l Consumers’ taps
19 Nitrite[^f01005] 0.50 mg/l Consumers’ taps
0.10 Treatment works
20 Pesticides[^f01006] [^f01007] Aldrin Dieldrin Heptachlor Heptachlor epoxide 0.030 µg/l Consumers’ taps
other pesticides[^f01006] [^f01007] 0.10 µg/l Consumers’ taps
21 Pesticides: Total[^f01008] 0.50 µg/l Consumers’ taps
22 Polycyclic aromatic hydrocarbons[^f01009] 0.10 µg/l Consumers’ taps
23 Selenium 10 µg/l Consumers’ taps
24 Tetrachloroethene and Trichloroethene[^f01010] 10 µg/l Consumers’ taps
25 Trihalomethanes: Total[^f01011] 100 µg/l Consumers’ taps
26 Vinyl chloride[^f01002] 0.50 µg/l
Part II: National requirements Part II: National requirements Part II: National requirements Part II: National requirements Part II: National requirements
1. Aluminium 200 µg/l Consumers’ taps
2. Colour 20 mg/l Pt/Co Consumers’ taps
3. Iron 200 µg/l Consumers’ taps
4. Manganese 50 µg/l Consumers’ taps
5. Odour Acceptable to consumers and no abnormal change Consumers’ taps
6. Sodium 200 mg/l Consumers’ taps
7. Taste Acceptable to consumers and no abnormal change Consumers’ taps
8. Tetrachloromethane 3 µg/l Consumers’ taps
9. Turbidity 4 NTU Consumers’ taps

SCHEDULE 2 — INDICATOR PARAMETERS

¹ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. ¹ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. ¹ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. ¹ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. ¹ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.
² The water should not be aggressive. ² The water should not be aggressive. ² The water should not be aggressive. ² The water should not be aggressive. ² The water should not be aggressive.
³ Where radon concentrations exceed 1000Bq/l, remedial action must be carried out on radiological protection grounds without further consideration. ³ Where radon concentrations exceed 1000Bq/l, remedial action must be carried out on radiological protection grounds without further consideration. ³ Where radon concentrations exceed 1000Bq/l, remedial action must be carried out on radiological protection grounds without further consideration. ³ Where radon concentrations exceed 1000Bq/l, remedial action must be carried out on radiological protection grounds without further consideration. ³ Where radon concentrations exceed 1000Bq/l, remedial action must be carried out on radiological protection grounds without further consideration.
⁴ Excluding tritium, potassium-40, radon and radon decay products. ⁴ Excluding tritium, potassium-40, radon and radon decay products. ⁴ Excluding tritium, potassium-40, radon and radon decay products. ⁴ Excluding tritium, potassium-40, radon and radon decay products. ⁴ Excluding tritium, potassium-40, radon and radon decay products.
⁵ Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides is required. ⁵ Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides is required. ⁵ Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides is required. ⁵ Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides is required. ⁵ Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides is required.
⁶ 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. ⁶ 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. ⁶ 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. ⁶ 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. ⁶ 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.
⁷ If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required. ⁷ If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required. ⁷ If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required. ⁷ If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required. ⁷ If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required.
(1) Item (2) Parameters (3) Specification Concentration or Value (maximum unless otherwise stated) or State (4) Units of Measurement (5) Point of monitoring
1 Ammonium 0.50 mg/l Consumers' taps
2 Chloride¹² 250 mg/l Supply point
3 Clostridium perfringens(including spores)¹ 0 Number/100ml Supply point
4 Coliform bacteria 0 Number/100ml Consumers' taps
5 Colony counts No abnormal change Number/1ml at 22°C Number/1ml at 37°C Consumers' taps, service reservoirs and treatment works
6 Conductivity¹² 2500 µS/cm at 20°C Supply point
7 Hydrogen ion² 9.5 pH units Consumers' taps
7 Hydrogen ion² 6.5 (minimum) pH units Consumers' taps
8 Radon (for radioactivity)¹³⁶ 100 Bq/l Supply point
9 Sulphate¹² 250 mg/l Supply point
10 Indicative dose (for radioactivity)¹⁴⁶⁷ 0.10 mSv Supply point
11 Total organic carbon (TOC)¹ No abnormal change mg/l Supply point
12 Tritium (for radioactivity)¹⁵⁶ 100 Bq/l Supply point
13 Turbidity 1 NTU Treatment works

SCHEDULE 3 — MONITORING PROGRAMMES

1

¹ A supply which consists of both groundwater and surface water is deemed to be a supply which consists only of surface water. ¹ A supply which consists of both groundwater and surface water is deemed to be a supply which consists only of surface water. ¹ A supply which consists of both groundwater and surface water is deemed to be a supply which consists only of surface water.
(1) Item (2) Parameter (3) Circumstances
1 Aluminium If used as water treatment chemicals or where the water originates from, or is influenced by, surface waters
2 Ammonium Where chloramination is practised
3 Coliform bacteria In all supplies
4 Colony Counts In all supplies
5 Colour In all supplies
6 Conductivity In all supplies
7 Disinfectant residual When disinfection treatment is practised
8 Escherichia coli (E. coli) In all supplies
9 Indicative Dose Where there is treatment in place to reduce the level of radionuclides in water intended for human consumption.
10 Iron¹ If used as water treatment chemicals or where the water originates from, or is influenced by, surface waters
11 Manganese¹ Where the water originates from, or is influenced by, surface waters
12 Nitrate Where chloramination is practised
13 Nitrite Where chloramination is practised
14 Odour In all supplies
15 pH (Hydrogen ion) In all supplies
16 Radon Where there is treatment in place to reduce the level of radionuclides in water intended for human consumption.
17 Taste In all supplies
18 Tritium Where there is treatment in place to reduce the level of radionuclides in water intended for human consumption.
19 Turbidity In all supplies
¹ Where the population is not an exact multiple of 5,000, the population figure should 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 should 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 should be rounded up to the nearest multiple of 5,000.
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² Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (5) and (6) below. ² Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (5) and (6) below. ² Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (5) and (6) below.
³ Group A monitoring in water supply zones is required only where chloramination is practised. In other circumstances Group B monitoring is required. ³ Group A monitoring in water supply zones is required only where chloramination is practised. In other circumstances Group B monitoring is required. ³ Group A monitoring in water supply zones is required only where chloramination is practised. In other circumstances Group B monitoring is required.
⁴ Group B monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, Group B monitoring is required at supply points. ⁴ Group B monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, Group B monitoring is required at supply points. ⁴ Group B monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, Group B monitoring is required at supply points.
⁵ To monitor for indicative dose (for radioactivity). ⁵ To monitor for indicative dose (for radioactivity). ⁵ To monitor for indicative dose (for radioactivity).
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) Substances and parameters subject to monitoring (2) Estimated population of water supply zone¹ (3) Number of samples per year
Group A monitoring Group A monitoring Group A monitoring
Escherichia coli (E. coli) < 100≥ 100 412 per 5,000 population¹
Coliform bacteria < 100≥ 100 412 per 5,000 population¹
Residual disinfectant < 100≥ 100 412 per 5,000 population¹
Aluminium <100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000 241224365276
Ammonium <100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000 241224365276
Colony counts <100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000 241224365276
Colour <100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000 241224365276
Conductivity² <100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000 241224365276
Hydrogen ion <100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000 241224365276
Iron <100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000 241224365276
Manganese <100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000 241224365276
Nitrate³ <100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000 241224365276
Nitrite³ <100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000 241224365276
Odour <100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000 241224365276
Taste <100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000 241224365276
Turbidity <100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000 241224365276
Group B monitoring Group B monitoring Group B monitoring
Aluminium <100100–4,9995,000–100,000 148
Antimony <100100–4,9995,000–100,000 148
Arsenic <100100–4,9995,000–100,000 148
Benzene² <100100–4,9995,000–100,000 148
Benzo(a)pyrene <100100–4,9995,000–100,000 148
Boron² <100100–4,9995,000–100,000 148
Bromate⁴ <100100–4,9995,000–100,000 148
Cadmium <100100–4,9995,000–100,000 148
Chromium <100100–4,9995,000–100,000 148
Clostridium perfringens (including spores) <100100–4,9995,000–100,000 148
Copper <100100–4,9995,000–100,000 148
Cyanide² <100100–4,9995,000–100,000 148
1,2 dichloroethane² <100100–4,9995,000–100,000 148
Enterococci <100100–4,9995,000–100,000 148
Fluoride² <100100–4,9995,000–100,000 148
Gross alpha²⁵ <100100–4,9995,000–100,000 148
Gross beta²⁵ <100100–4,9995,000–100,000 148
Iron <100100–4,9995,000–100,000 148
Lead <100100–4,9995,000–100,000 148
Manganese <100100–4,9995,000–100,000 148
Mercury² <100100–4,9995,000–100,000 148
Nickel <100100–4,9995,000–100,000 148
Nitrate³ <100100–4,9995,000–100,000 148
Nitrite³ <100100–4,9995,000–100,000 148
Pesticides and relatedproducts² <100100–4,9995,000–100,000 148
Polycyclic aromatic hydrocarbons <100100–4,9995,000–100,000 148
Radon²⁶ <100100–4,9995,000–100,000 148
Selenium <100100–4,9995,000–100,000 148
Sodium <100100–4,9995,000–100,000 148
Trichloroethene/Tetrachloroethene² <100100–4,9995,000–100,000 148
Tetrachloromethane² <100100–4,9995,000–100,000 148
Trihalomethanes <100100–4,9995,000–100,000 148
Chloride² <100100–4,9995,000–100,000 148
Sulphate² <100100–4,9995,000–100,000 148
Total organic carbon² <100100–4,9995,000–100,000 148
Tritium² <100100–4,9995,000–100,000 148
¹ The water undertaker may use the number of inhabitants in a supply zone instead of the volume of water to determine the minimum frequency, assuming a water consumption of 200 l/day/capita. ¹ The water undertaker may use the number of inhabitants in a supply zone instead of the volume of water to determine the minimum frequency, assuming a water consumption of 200 l/day/capita. ¹ The water undertaker may use the number of inhabitants in a supply zone instead of the volume of water to determine the minimum frequency, assuming a water consumption of 200 l/day/capita.
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² The volumes are calculated as averages taken over a calendar year. ² The volumes are calculated as averages taken over a calendar year. ² The volumes are calculated as averages taken over a calendar year.
³ Sampling at treatment works when chloramination is practised. ³ Sampling at treatment works when chloramination is practised. ³ Sampling at treatment works when chloramination is practised.
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 Group B monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, Group B monitoring is required in water supply zones ⁵ Group B monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, Group B monitoring is required in water supply zones ⁵ Group B monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, Group B monitoring is required in water supply zones
⁶ To monitor for indicative dose (for radioactivity). ⁶ To monitor for indicative dose (for radioactivity). ⁶ To monitor for indicative dose (for radioactivity).
(1) Item (2) Substances and parameters (3) Volume of water supplied m³/d¹
1 Escherichia coli (E. coli) <2020-1,9992,000-5,9996,000-11,999≥ 12,000
2 Coliform bacteria <2020-1,9992,000-5,9996,000-11,999≥ 12,000
3 Colony counts <2020-1,9992,000-5,9996,000-11,999≥ 12,000
4 Nitrite³ <2020-1,9992,000-5,9996,000-11,999≥ 12,000
5 Residual disinfectant <2020-1,9992,000-5,9996,000-11,999≥ 12,000
6 Turbidity <2020-1,9992,000-5,9996,000-11,999≥ 12,000
Group A monitoring Group A monitoring Group A monitoring
7 Conductivity <2020-9991,000-1,9992,000-5,9996,000-9,99910,000-15,99916,000-32,99933,000-49,99950,000-67,99968,000-84,99985,000-101,999102,000-119,999120,000-241,999242,000-484,999485,000-728,999
Group A monitoring Group A monitoring Group A monitoring
8 Gross alpha⁶ <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥ 650,000
9 Gross beta⁶ <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥ 650,000
10 Radon <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥ 650,000
11 Tritium <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥ 650,000
Group B monitoring Group B monitoring Group B monitoring
12 Benzene <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
13 Boron <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
14 Bromate⁵ <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
15 Clostridium perfringens (including spores) <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
16 Cyanide <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
17 1,2,dichloroethane <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
18 Fluoride <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
19 Mercury <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
20 Nitrite⁴ <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
21 Pesticides and related products <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
22 Trichloroethene/Tetrachloroethene <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
23 Tetrachloromethane <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
24 Chloride <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
25 Sulphate <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
26 Total Organic Carbon <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
27 Radon <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
28 Tritium <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
29 Gross alpha⁶ <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
30 Gross beta⁶ <2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000

SCHEDULE 4 — ANALYTICAL METHODOLOGY

(1) Parameter (2) Method
Clostridium perfringens(including spores) EN ISO 14189
Coliform bacteria EN ISO 9308-1 or EN ISO 9308-2
Colony count 22°C-enumeration of culturable microorganisms ENISO 6222
Colony count 36°C-enumeration of culturable microoganisms EN ISO 6222
Enterococci EN ISO 7899-2
Escherichia coli (E. coli) EN ISO 9308-1 or EN ISO 9308-2
Pseudomonas aeruginosa EN ISO 16266
¹ Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification. ¹ Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.
--- ---
² Uncertainty of measurement is a non-negative parameter characterising the dispersion of the quantity values being attributed to a measurand, based on the information used. The performance criterion for measurement uncertainty (k = 2) is the percentage of the parametric value stated in the table or better. Measurement uncertainty must be estimated at the level of the parametric value, unless otherwise specified. ² Uncertainty of measurement is a non-negative parameter characterising the dispersion of the quantity values being attributed to a measurand, based on the information used. The performance criterion for measurement uncertainty (k = 2) is the percentage of the parametric value stated in the table or better. Measurement uncertainty must be estimated at the level of the parametric value, unless otherwise specified.
³ If the value of uncertainty of measurement cannot be met, the best available technique should be selected (up to 60%). ³ If the value of uncertainty of measurement cannot be met, the best available technique should be selected (up to 60%).
⁴ The method determines total cyanide in all forms. ⁴ The method determines total cyanide in all forms.
⁵ Values for trueness, precision and uncertainty of measurement are expressed in pH units. ⁵ Values for trueness, precision and uncertainty of measurement are expressed in pH units.
⁶ Reference method EN ISO 8467. ⁶ Reference method EN ISO 8467.
⁷ The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30 % can be achieved for several pesticides, higher values up to 80 % may be allowed for a number of pesticides ⁷ The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30 % can be achieved for several pesticides, higher values up to 80 % may be allowed for a number of pesticides
⁸ The performance characteristics apply to individual substances, specified at 25% of the parametric value in Table B in Schedule 1. ⁸ The performance characteristics apply to individual substances, specified at 25% of the parametric value in Table B in Schedule 1.
⁹ The performance characteristics apply to individual substances, specified at 50% of the parametric value in Table B in Schedule 1. ⁹ The performance characteristics apply to individual substances, specified at 50% of the parametric value in Table B in Schedule 1.
¹⁰ The uncertainty of measurement should be estimated at the level of 3 mg/l of the total organic carbon. CEN 1484 Guidelines for the determination of total organic carbon and dissolved organic carbon must be used. ¹⁰ The uncertainty of measurement should be estimated at the level of 3 mg/l of the total organic carbon. CEN 1484 Guidelines for the determination of total organic carbon and dissolved organic carbon must be used.
¹¹ The uncertainty of measurement must be estimated at the level of 1.0 NTU (nephelometric turbidity units) in accordance with EN ISO 7027. ¹¹ The uncertainty of measurement must be estimated at the level of 1.0 NTU (nephelometric turbidity units) in accordance with EN ISO 7027.
(1) Parameter¹ (2) Uncertainty of measurement (% of parametric value, except pH)²
Aluminium 25
Ammonium 40
Antimony 40
Arsenic 30
Benzo(a)pyrene³ 50
Benzene 40
Boron 25
Bromate 40
Cadmium 25
Chloride 15
Chromium 30
Conductivity 20
Copper 25
Cyanide⁴ 30
1,2-dichloroethane 40
Fluoride 20
Hydrogen ion concentration pH (expressed in pH units)⁵ 0.2
Iron 30
Lead 25
Manganese 30
Mercury 30
Nickel 25
Nitrate 15
Nitrite 20
Oxidisability⁶ 50
Pesticides⁷ 30
Polycyclic aromatic hydrocarbons⁸ 50
Selenium 40
Sodium 15
Sulphate 15
Tetrachloroethene⁹ 30
Tetrachloromethane 30
Trichloroethene⁹ 40
Trihalomethanes: total⁸ 40
Total organic carbon¹⁰ 30
Turbidity¹¹ 30
¹ Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification. ¹ Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.
--- ---
² Trueness is a measure of systematic error, i.e. the difference between the mean value of the large number of repeated measurements and the true value. Further specifications are those set out in ISO 5725. ² Trueness is a measure of systematic error, i.e. the difference between the mean value of the large number of repeated measurements and the true value. Further specifications are those set out in ISO 5725.
³ Precision is a measure of random error and is usually expressed as the standard deviation (within and between batches) of the spread of results from the mean. Acceptable precision is twice the relative standard deviation. This term is further specified in ISO 5725. ³ Precision is a measure of random error and is usually expressed as the standard deviation (within and between batches) of the spread of results from the mean. Acceptable precision is twice the relative standard deviation. This term is further specified in ISO 5725.
⁴ Limit of detection is either three times the standard deviation within a batch of a natural sample containing a low concentration of the parameter; or five times the standard deviation of a blank sample (within a batch). ⁴ Limit of detection is either three times the standard deviation within a batch of a natural sample containing a low concentration of the parameter; or five times the standard deviation of a blank sample (within a batch).
⁵ The method determines total cyanide in all forms. ⁵ The method determines total cyanide in all forms.
⁶ Values for trueness, precision and uncertainty of measurement are expressed in pH units. ⁶ Values for trueness, precision and uncertainty of measurement are expressed in pH units.
⁷ Reference method EN ISO 8467 1995. ⁷ Reference method EN ISO 8467 1995.
⁸ The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30% can be achieved for several pesticides, higher values up to 80% may be allowed for a number of pesticides ⁸ The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30% can be achieved for several pesticides, higher values up to 80% may be allowed for a number of pesticides
⁹ The performance characteristics apply to individual substances, specified at 25% of the parametric value in Table B in Schedule 1. ⁹ The performance characteristics apply to individual substances, specified at 25% of the parametric value in Table B in Schedule 1.
¹⁰ The performance characteristics apply to individual substances, specified at 50% of the parametric value in Table B in Schedule 1. ¹⁰ The performance characteristics apply to individual substances, specified at 50% of the parametric value in Table B in Schedule 1.
¹¹ The performance characteristics apply to prescribed value 4 NTU. ¹¹ The performance characteristics apply to prescribed value 4 NTU.
¹² The performance characteristics apply to prescribed value 1 NTU for water leaving surface water treatment works. ¹² The performance characteristics apply to prescribed value 1 NTU for water leaving surface water treatment works.
(1) Parameter¹ (2) Trueness²
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
Cyanide⁵ 10
1,2-dichloroethane 25
Fluoride 10
Hydrogen ion concentration pH (expressed in pH units)⁶ 0.2
Iron 10
Lead 10
Manganese 10
Mercury 20
Nickel 10
Nitrate 10
Nitrite 10
Oxidisability⁷ 25
Pesticides⁸ 25
Polycyclic aromatic hydrocarbons⁹ 25
Selenium 10
Sodium 10
Sulphate 10
Tetrachloroethene¹⁰ 25
Tetrachloromethane 20
Trichloroethene¹⁰ 25
Trihalomethanes: total⁹ 25
Turbidity¹¹ 10
Turbidity¹² 25

SCHEDULE 5 — MONITORING FOR INDIVIDUAL RADIONUCLIDES

1

A water undertaker may use a screening strategy for gross alpha and gross beta to monitor for the parametric indicator value for indicative dose . The recommended screening value for gross alpha is 0.1Bq/l and for gross beta is 1.0Bq/l.

2

Calculation of the ID

3

Performance characteristics and method of analysis.

SCHEDULE 6 — REVOCATIONS

Revocations coming into operation on the 27th October 2017

No. Regulations revoked Extent of revocation
1. The Water Supply (Water Quality) Regulations (Northern Ireland) 2007 The whole Regulations
2. The Water Supply (Water Quality) (Amendment) Regulations (NI) 2009 The whole Regulations
3. The Water Supply (Water Quality) (Amendment) Regulations (NI) 2010 The whole Regulations
4. The Water Supply (Water Quality) (Amendment) Regulations (NI) 2015 The whole Regulations

Signed

Sealed with the Official Seal of the Department of Agriculture, Environment and Rural Affairs on 6th October 2017

Dave Foster — A senior officer of the — Department of the Environment

Explanatory note

(This note is not part of the Regulations)

Footnotes

[^f00001]: Formerly the Department of the Environment; see section 1(2) and (11) and Schedule 1 to, the Departments Act (Northern Ireland) 2010 (2016 c.5 (N.I.)). Pursuant to section 1(9) of that Act, the Department of the Environment is dissolved

[^f00002]: S.I. 2006/3336 (N.I. 21) as amended by 2016 c.13 (N.I.)

[^f00003]: S.I. 2008/301

[^f00004]: 1972 c.68

[^f00005]: 1972 c.9 (NI)

[^f00006]: 1991 No. 194 (N.I. 1)

[^f00007]: OJ No. L 330, 5.12.1998, p.32

[^f00008]: OJ No. L 260, 7.10.2015, p.6

[^f00009]: S.I. 2006 No. 3336 (N.I. 21)

[^f00010]: S.R. 2007/147 as amended by S.R. 2009/246, S.R. 2010/128 and S.R. 2015/ 363

[^f00011]: 1954 c.33 (N.I.)

[^f00012]: This standard was approved by the European Committee for Standardization (CEN) on 5th July 2013. Under reference BS EN 15975-2:2013, it is published as a UK standard by the British Standards Institution (ISBN 978 0 580 84737 0).

[^f00013]: S.R. 2017 No.81

[^f00014]: OJ No L 88, 4.4.2011, p 5, as last amended by Commission Delegated Regulation (EU) No 574/2014 (OJ No L 159, 28.5.2014, p 41).

[^f00015]: OJ No L 241, 17.9.2015, p 1.

[^f00016]: Where appropriate gross beta activity may be replaced by residual beta activity after subtraction of the K-40 activity concentration.

Revocations coming into operation on the 27th October 2017

No. Regulations revoked Extent of revocation
1. The Water Supply (Water Quality) Regulations (Northern Ireland) 2007 The whole Regulations
2. The Water Supply (Water Quality) (Amendment) Regulations (NI) 2009 The whole Regulations
3. The Water Supply (Water Quality) (Amendment) Regulations (NI) 2010 The whole Regulations
4. The Water Supply (Water Quality) (Amendment) Regulations (NI) 2015 The whole Regulations

Editorial notes

[^c22857221]: Formerly the Department of the Environment; see section 1(2) and (11) and Schedule 1 to, the Departments Act (Northern Ireland) 2010 (2016 c.5 (N.I.)). Pursuant to section 1(9) of that Act, the Department of the Environment is dissolved

[^c22857231]: S.I. 2006/3336 (N.I. 21) as amended by 2016 c.13 (N.I.)

[^c22857241]: S.I. 2008/301

[^c22857251]: 1972 c.68

[^c22857261]: 1972 c.9 (NI)

[^c22857271]: 1991 No. 194 (N.I. 1)

[^c22857281]: OJ No. L 330, 5.12.1998, p.32

[^c22857291]: OJ No. L 260, 7.10.2015, p.6

[^c22857311]: S.R. 2007/147 as amended by S.R. 2009/246, S.R. 2010/128 and S.R. 2015/ 363

[^c22857321]: 1954 c.33 (N.I.)

[^c22857331]: This standard was approved by the European Committee for Standardization (CEN) on 5th July 2013. Under reference BS EN 15975-2:2013, it is published as a UK standard by the British Standards Institution (ISBN 978 0 580 84737 0).

[^c22857341]: S.R. 2017 No.81

[^c22857371]: Where appropriate gross beta activity may be replaced by residual beta activity after subtraction of the K-40 activity concentration.

[^key-9f0c978c111a6985f26a08e644d3167a]: Words in Sch. 5 para. 2 substituted (24.12.2018) by The Environment (Miscellaneous Amendments) Regulations (Northern Ireland) 2018 (S.R. 2018/200), reg. 1(1), Sch. 2 para. 17(a)

[^key-991a32ce0ef3927865eaa995d50777f6]: Words in Sch. 5 Table 1 substituted (24.12.2018) by The Environment (Miscellaneous Amendments) Regulations (Northern Ireland) 2018 (S.R. 2018/200), reg. 1(1), Sch. 2 para. 17(b)

[^key-d0396518636f6cd43bcdbfe53449987f]: Reg. 2(5) inserted (31.12.2020) by The Water (Amendment) (Northern Ireland) (EU Exit) Regulations 2019 (S.I. 2019/112), regs. 1(1), 14(2); 2020 c. 1, Sch. 5 para. 1(1)

[^key-05b6c74f3d33d7c9bccd322ca87a9fba]: Reg. 18(18) omitted (31.12.2020) by virtue of The Water (Amendment) (Northern Ireland) (EU Exit) Regulations 2019 (S.I. 2019/112), regs. 1(1), 14(3); 2020 c. 1, Sch. 5 para. 1(1)

[^key-1cd737ce3c6ce89e8a0f8f55676c3a53]: Words in reg. 19(7) substituted (31.12.2020) by The Water (Amendment) (Northern Ireland) (EU Exit) Regulations 2019 (S.I. 2019/112), regs. 1(1), 14(4); 2020 c. 1, Sch. 5 para. 1(1)

[^key-90e86e3a4d939b7db48db9d82df0e7c5]: Words in reg. 25(5) substituted (31.12.2020) by The Water (Amendment) (Northern Ireland) (EU Exit) Regulations 2019 (S.I. 2019/112), regs. 1(1), 14(5)(a); 2020 c. 1, Sch. 5 para. 1(1)

[^key-8a8127ce46d0aaa8ca691c3e8180b02f]: Reg. 25(7)(8) omitted (31.12.2020) by virtue of The Water (Amendment) (Northern Ireland) (EU Exit) Regulations 2019 (S.I. 2019/112), regs. 1(1), 14(5)(b); 2020 c. 1, Sch. 5 para. 1(1)

[^key-3aec53a32fcc014ed6ca3ff34f79c852]: Reg. 33(2)(a) and word omitted (31.12.2020) by virtue of The Water (Amendment) (Northern Ireland) (EU Exit) Regulations 2019 (S.I. 2019/112), regs. 1(1), 14(6)(a); 2020 c. 1, Sch. 5 para. 1(1)

[^key-d96daeeef6a00f85dbc168beecb9c12b]: Words in reg. 33(2)(b) omitted (31.12.2020) by virtue of The Water (Amendment) (Northern Ireland) (EU Exit) Regulations 2019 (S.I. 2019/112), regs. 1(1), 14(6)(b); 2020 c. 1, Sch. 5 para. 1(1)

[^key-c2374f1e8d34938d43c60278ab720a31]: Reg. 33(3)(b) omitted (31.12.2020) by virtue of The Water (Amendment) (Northern Ireland) (EU Exit) Regulations 2019 (S.I. 2019/112), regs. 1(1), 14(6)(c); 2020 c. 1, Sch. 5 para. 1(1)

[^key-cf5377f1b4626bd6837e51fa0f618997]: Words in reg. 33(14) omitted (31.12.2020) by virtue of The Water (Amendment) (Northern Ireland) (EU Exit) Regulations 2019 (S.I. 2019/112), regs. 1(1), 14(6)(d); 2020 c. 1, Sch. 5 para. 1(1)

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