The Water Supply (Water Quality) Regulations 2000

regulations 2 and 4

SCHEDULE 1 PRESCRIBED CONCENTRATIONS AND VALUES

TABLE A

MICROBIOLOGICAL PARAMETERS

Part I: Directive requirements

Item	Parameters	Concentration or Value maximum)	Units of Measurement	Point of compliance
1.	Enterococci	0	number/100ml	Consumers' taps
2.	Escherichia coli (E. coli)	0	number/100ml	Consumers' taps

Part II: National requirements

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

TABLE B

CHEMICAL PARAMETERS

Part I: Directive requirements

Item	Parameters	Concentration or Value maximum)	Units of Measurement	Point of compliance
Notes: (i) 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.
(ii) See also regulation 6(6).
(iii) See also regulation 4(2)(d).
(iv) See the definition of “pesticides and related products” in regulation 2.
(v) The parametric value applies to each individual pesticide.
(vi) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.
(vii) 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.
(viii) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
(ix) 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.
1.	Acrylamide	0.10	μg/l	(i)
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	μgBrO3/l	Consumers' taps
8.	Cadmium	5.0	μgCd/l	Consumers' taps
9.	Chromium	50	μgCr/l	Consumers' taps
10.	Copper(ii)	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	(i)
14.	Fluoride	1.5	mgF/l	Consumers' taps
15.	Lead (ii)	(a) 25, from 25th December 2003 until immediately before 25th December 2013	μgPb/l	Consumers' taps
		(b) 10, on and after 25th December 2013	μgPb/l	Consumers' taps
16.	Mercury	1.0	μgHg/l	Consumers' taps
17.	Nickel (ii)	20	μgNi/l	Consumers' taps
18.	Nitrate (iii)	50	mgNO3/l	Consumers' taps
19.	Nitrite (iii)	0.50	mgNO2/l	Consumers' taps
		0.10		Treatment works
20.	Pesticides (iv)(v)
	Aldrin	0.030	μg/l	Consumers' taps
	Dieldrin
	Heptachlor
	Heptachlor epoxide
	other pesticides	0.10	μg/l	Consumers' taps
21.	Pesticides: Total (vi)	0.50	μg/l	Consumers' taps
22.	Polycyclic aromatic hydrocarbons (vii)	0.10	μg/l	Consumers' taps
23.	Selenium	10	μgSe/l	Consumers' taps
24.	Tetrachloroethene and Trichloroethene (viii)	10	μg/l	Consumers' taps
25.	Trihalomethanes: Total (ix)	100	μg/l	Consumers' taps
26.	Vinyl chloride	0.50	μg/l	(i)

Part II: 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.	Hydrogen ion	10.0	pH value	Consumers' taps
		6.5 (minimum)	pH value
4.	Iron	200	μgFe/l	Consumers' taps
5.	Manganese	50	μgMn/l	Consumers' taps
6.	Odour	3 at 25°C	Dilution number	Consumers' taps
7.	Sodium	200	mgNa/l	Consumers' taps
8.	Taste	3 at 25°C	Dilution number	Consumers' taps
9.	Tetrachloromethane	3	μg/l	Consumers' taps
10.	Turbidity	4	NTU	Consumers' taps