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

Regulation 5

SCHEDULE 1 N.I. PRESCRIBED CONCENTRATIONS AND VALUES

Wholesomeness N.I.

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