
1 
These Regulations may be cited as the Surface Waters (Classification) Regulations 1989 and shall come into force on 1st September 1989.
2 
The classifications prescribed by these Regulations apply only in relation to inland waters (including any lake or pond which, by virtue of an order made under section 103(5) of the Water Act 1989, is to be treated as a relevant lake or pond).
3 
The classifications DW1, DW2 and DW3 and the criteria for those classifications set out in the Schedule to these Regulations shall apply for classifying waters by reference to their suitability for abstraction by water undertakers for supply (after treatment) as drinking water.
Signed by authority of the Secretary of State
Michael Howard
Minister for Water and Planning
Department of the Environment
6th July 1989Peter Walker
Secretary of State for Wales
6th July 1989
SCHEDULE
Regulation 3

The limits set out below are maxima

(1) (2) (3) (4) (5)
No. in Annex II to 75/440/EEC Parameters DW1 DW2 DW3
2 Coloration (after simple filtration) mg/1 Pt Scale 20 100 200
4 Temperature °C 25 25 25
7 Nitrates mg/1 NO3 50 50 50
8(1) 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) paranitraniline 4 aminoantipyrine mg/1 C6H5OH 0·001 0·005; 0·1
32 Dissolved or emulsified hydrocarbons (after extraction by petroleum ether) mg/1 0·05 0·2 1
33 Polycyclic aromatic hydrocarbons mg/1 0·0002 0·0002 0·001
34 Total pesticides (parathion, BHC, dieldrin) mg/1 0·001 0·0025 0·005
39 Ammonia mg/1 NH4  1·5 4
 
Note
(1) The value given is an upper limit set in relation to the mean annual temperature (high and low).
