The Water Supply (Water Quality) Regulations 2018

Regulations 2, 4, 6, 14, 15, 18, 20 and 22

SCHEDULE 1 PRESCRIBED CONCENTRATIONS AND VALUES

Table A Microbiological Parameters

Part 1: Directive requirements
Item	Parameters	Concentration or Value (maximum)	Units of Measurement	Point of compliance
(1) Compliance required as to 95% of samples from each service reservoir (regulation 4(6)).
1	Enterococci	0	number/100 ml	Consumers’ taps
2	E.coli	0	number/100 ml	Consumers’ taps
Part 2: National requirements
1	Coliform bacteria	0	number/100 ml	Service reservoirs (1) and water treatment works
2	E. coli	0	number/100 ml	Service reservoirs and water treatment works
Note:

Table B Chemical Parameters

Part 1: National requirements

(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).
(3) See the definition of “pesticides and related products” in regulation 2.
(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.
(6) The specified compounds are: benzo(b)fluoranthene 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.
(8) The specified compounds are: chloroform bromoform dibromochloromethane bromodichloromethane. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
Item	Parameters	Concentration or Value (maximum)	Units of Measurement	Point of compliance
1	Acrylamide	0.10	μg/l	(1)
2	Antimony	5.0	μgSb/l	Consumers’ taps
3	Arsenic	10	μgAs/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	mgB/l	Consumers’ taps
7	Bromate	10	μBrO3/l	Consumers’ taps
8	Cadmium	5.0	μgCd/l	Consumers’ taps
9	Chromium	50	μgCr/l	Consumers’ taps
10	Copper	2.0	mgCu/l	Consumers’ taps
11	Cyanide	50	μgCN/l	Consumers’ taps
12	1, 2 dichloroethane	3.0	μg/l	Consumers’ taps
13	Epichlorohydrin	0.10	μg/l	(1)
14	Fluoride	1.5	mgF/l	Consumers’ taps
15	Lead	10	μgPb/l	Consumers’ taps
16	Mercury	1.0	μgPb/l	Consumers’ taps
17	Nickel	20	μgNi/l	Consumers’ taps
18	Nitrate (2)	50	mgNO3/l	Consumers’ taps
19	Nitrite (2)	0.50	mgNO2/l	Consumers’ taps
		0.10		Treatment Works
20	Pesticides (3),(4)
	Aldrin	0.030	μg/l	Consumers’ taps
	Dieldrin
	Heptachlor
	Heptachlor
	epoxide
	other pesticides	0.10	μg/l	Consumers’ taps
21	Pesticides: Total (5)	0.50	μg/l	Consumers’ taps
22	Polycyclic aromatic hydrocarbons (6)	0.10	μg/l	Consumers’ taps
23	Selenium	10	μgSe/l	Consumers’ taps
24	Tetrachloroethene and Trichloroethene (7)	10	μg/l	Consumers’ taps
25	Trihalomethanes: Total (8)	100	μg/l	Consumers’ taps
26	Vinyl chloride	0.50	μg/l	(1)
Notes:

Part 2: National requirements

Item	Parameters	Concentration or Value (maximum unless otherwise stated)	Units of Measurement	Point of compliance
1	Aluminium	200	μgAl/l	Consumers’ taps
2	Colour	20	mg/l Pt/Co	Consumers’ taps
3	Iron	200	μgFe/l	Consumers’ taps
4	Manganese	50	μgMn/l	Consumers’ taps
5	Odour	Acceptable to consumers and no abnormal change		Consumers’ taps
6	Sodium	200	mgNa/l	Consumers’ taps
7	Taste	Acceptable to consumers and no abnormal change	…	Consumers’ taps
8	Tetrachlorome-thane	3	μg/l	Consumers’ taps
9	Turbidity	4	NTU	Consumers’ taps