Schedule 1 Characteristics of Surface Water intended for the Abstraction of Drinking WaterI1

Northern Ireland Not yet in force

No in Annex II to 75/440/EEC	Parameters		DW1		DW2		DW3
			G	I	G	I	G	I
(1) The values given are upper limits set in relation to the mean annual temperature (high and low).
(2) This parameter has been included to satisfy the ecological requirements of certain types of environment.
* See regulation 6(1)(d)
(O) See regulation 6(1)(b)
1	pH		6.5 to 8.5		5.5 to 9		5.5 to 9
2	Coloration (after simple filtration)	mg/l Pt scale	10	20^f1	50	100	50	200
3	Total suspended solids	mg/l SS	25
4	Temperature	°C	22	25	22	25	22	25
5	Conductivity	μs/cm⁻¹ at 20°C	1,000		1,000		1,000
6	Odour	(dilution factor at 25°C)	3		10		20
7^f2	Nitrates	mg/l NO₃	25	50		50		50
8^f3	Fluorides	mg/l F	0.7 to 1	1.5	0.7 to 1.7		0.7 to 1.7
10	Dissolved iron	mg/l Fe	0.1	0.3	1	2	1
11	Manganese	mg/l Mn	0.05		0.1		1
12	Copper	mg/l Cu	0.02	0.05	0.05		1
13	Zinc	mg/l Zn	0.5	3	1	5	1	5
14	Boron	mg/l B	1		1		1
19	Arsenic	mg/l As	0.01	0.05		0.05	0.05	0.1
20	Cadmium	mg/l Cd	0.001	0.005	0.001	0.005	0.001	0.005
21	Total Chromium	mg/l Cr		0.05		0.05		0.05
22	Lead	mg/l Pb		0.05		0.05		0.05
23	Selenium	mg/l Se		0.01		0.01		0.01
24	Mercury	mg/1 Hg	0.0005	0.001	0.0005	0.001	0.0005	0.001
25	Barium	mg/l Ba		0.1		1		1
26	Cyanide	mg/l CN		0.05		0.05		0.05
27	Sulphates	mg/l SO₄	150	250	150	250	150	250
28	Chlorides	mg/l Cl	200		200		200
29	Surfactants (reacting with methyl blue)	mg/l (lauryl sulphate)	0.2		0.2		0.5
30^f4	Phosphates	mg/l P₂O₅	0.4		0.7		0.7
31	Phenols (phenol index) paranitraniline 4 amino-antipyrine	mg/l C₆H₅OH		0.001	0.001	0.005	0.01	0.1
32	Dissolved or emulsified hydrocarbons (after extraction by petroleum ether)	mg/l		0.05		0.2	0.5	1
33	Polycyclic aromatic hydrocarbons	mg/l		0.0002		0.0002		0.001
34	Total pesticides (parathion, hexachlorocyclohexane, dieldrin)	mg/l		0.001		0.0025		0.005
35	Chemical oxygen demand (COD)	mg/l O₂					30
36	Dissolved oxygen saturation rate	% O₂	>70		>50		>30
37	Biochemical oxygen demand (BOD₅) (at 20°C without nitrification)	mg/l O₂	<3		<5		<7
38	Nitrogen by Kjeldahl method (except NO₃)	mg/l N	1		2		3
39	Ammonia	mg/l NH₄	0.05		1	1.5	2	4
40	Substances extractable with chloroform	mg/l SEC	0.1		0.2		0.5
43	Total coliforms 37°C	/100 ml	50		5,000		50,000
44	Faecal coliforms	/100 ml	20		2,000		20,000
45	Faecal streptococci	/100 ml	20		1,000		10,000
46	Salmonella		Not Present in 5,000 ml		Not Present in 1,000 ml

Annotations

Commencement

I1: Sch. 1 in operation at 20.2.1997, see reg. 1

Footnotes

f1

(O)

See regulation 6(1)(b)

f2

See regulation 6(1)(d)

f3

(1)

The values given are upper limits set in relation to the mean annual temperature (high and low).

f4

(2)

This parameter has been included to satisfy the ecological requirements of certain types of environment.