# The Water Supply (Water Quality) Regulations (Northern Ireland) 2017, Part: Wholesomeness TABLE A MICROBIOLOGICAL PARAMETERS 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)). (1) Item (2) Parameters (3) Concentration or Value (maximum) (4) Unit of measurement (5) Point of Compliance1 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 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 TABLE B CHEMICAL PARAMETERS 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. 3 See also regulation 8(5). 4 See also regulation 5(3)(d). 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. 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. 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. (1) Item (2) Parameters (3) Concentration or Value (maximum) (5) Units of Measurement (6) Point of compliance Part I: Directive requirements 1. Acrylamide1 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 Bromate2 10 µg/l Consumers' taps 8 Cadmium 5.0 µg/l Consumers' taps 9 Chromium 50 µg/l Consumers' taps 10 Copper3 2.0 mg/l Consumers' taps 11 Cyanide 50 µg/l Consumers' taps 12 1, 2 dichloroethane 3.0 µg/l Consumers' taps 13 Epichlorohydrin1 0.10 µg/l 14 Fluoride 1.5 mg/l Consumers' taps 15 Lead3 10 µg/l Consumers' taps 16 Mercury 1.0 µg/l Consumers' taps 17 Nickel3 20 µg/l Consumers' taps 18 Nitrate4 50 mg/l Consumers' taps 19 Nitrite4 0.50 mg/l Consumers' taps 0.10 Treatment works 20 Pesticides56 Aldrin Dieldrin Heptachlor Heptachlor epoxide 0.030 µg/l Consumers' taps other pesticides56 0.10 µg/l Consumers' taps 21 Pesticides: Total7 0.50 µg/l Consumers' taps 22 Polycyclic aromatic hydrocarbons8 0.10 µg/l Consumers' taps 23 Selenium 10 µg/l Consumers' taps 24 Tetrachloroethene and Trichloroethene9 10 µg/l Consumers' taps 25 Trihalomethanes: Total10 100 µg/l Consumers' taps 26 Vinyl chloride1 0.50 µg/l 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 --- Source: https://www.legislation.gov.uk/nisr/2017/212/schedule/1/part (the official version) Page: https://openlegislation.uk/water-supply-water-quality-regulations-northern-ireland-2017/schedule-1/part Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.