Schedule 1 CRITERIA FOR CLASSIFICATION OF WATERS

The limits set out below are maxima

No in Annex II to the 1975 Directive	Parameters		DW1	DW2	DW3
(0) See regulation 7(1)(b)
* See regulation 7(1)(d)
2	Colouration (after simple filtration)	mg/1 Pt Scale	20^f1	100	200
4	Temperature	°C	25	25	25
7^f2	Nitrates	mg/1 NO₃	50	50	50
8	Fluorides	mg/1 F	1.5
10	Dissolved iron	mg/1 Fe	0.3	2
12	Copper	mg/1 Cu	0.05
13	Zinc	mg/1 Zn	3	5	5
19	Arsenic	mg/1 As	0.05	0.05	0.1
20	Cadmium	mg/1 Cd	0.005	0.005	0.005
21	Total Chromium	mg/1 Cr	0.05	0.05	0.05
22	Lead	mg/1 Pb	0.05	0.05	0.05
23	Selenium	mg/1 Se	0.01	0.01	0.01
24	Mercury	mg/1 Hg	0.001	0.001	0.001
25	Barium	mg/1 Ba	0.1	1	1
26	Cyanide	mg/1 CN	0.05	0.05	0.05
27	Sulphates	mg/1 SO₄	250	250	250
31	Phenols (phenol index) paranitroaniline 4-aminoantipyrine	mg/1 C₆H₅OH	0.001	0.005	0.1
32	Dissolved or emulsified hydro carbons (after extraction by petroleum ether)	mg/1	0.05	0.2	1
33	Polycyclic aro matic hydrocar bons	mg/1	0.0002	0.0002	0.001
34	Total pesticides (parathion, hexachlorocyclohexane, dieldrin)	mg/1	0.001	0.0025	0.005
39	Ammonia	mg/1 NH₄		1.5	4

Annotations

f1

(0)

See regulation 7(1)(b)

f2

See regulation 7(1)(d)