The Water Supply (Water Quality) Regulations (Northern Ireland) 2007

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(*)
(*) Where water is supplied from a tanker see regulation 4(3)(a)
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
(**) Compliance required as to 95% of samples taken for coliform bacteria 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 Dieldrin Heptachlor Heptachlor epoxide	0.030	µg/l	Consumers’ taps
	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

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