The Surface Waters (Classification) (Scotland) Regulations 1990

S.I. 1990/121 · Made 23 January 1990

WATER SUPPLY, SCOTLAND

Made 23rd January 1990

Laid before Parliament 8th February 1990

Coming into force 1st May 1990

The Secretary of State, in exercise of the powers conferred on him by section 30B of the Control of Pollution Act 1974^f1, hereby makes the following Regulations:

Annotations to the whole text

Footnotes

f1: 1974 c. 40; section 30B was inserted, as part of a substitution of a new Part II of the Act, by the Water Act 1989 (c. 15), Schedule 23 paragraph 4.

1Citation and commencement
2Classification of waters
3Classification of waters
Signature
Schedule Criteria for the classification of waters
Explanatory note

1Citation and commencement

These Regulations may be cited as the Surface Waters (Classification) (Scotland) Regulations 1990 and shall come into force on 1st May 1990.

These Regulations, and the system of classification prescribed by these Regulations, apply in relation to inland waters (including any loch or pond which, by virtue of an order made under section 30A(5)(b) of the Control of Pollution Act 1974, is to be treated as a relevant loch or pond).

3Classification of waters

The waters to which these Regulations apply shall be classified DW1, DW2 or DW3, as the case may be, according to the criteria set out in the Schedule to these Regulations, which criteria shall determine their suitability for abstraction by water authorities within the meaning of the Water (Scotland) Act 1980 for supply (after treatment) as drinking water.

Signature

James Douglas-Hamilton

Parliamentary Under Secretary of State, Scottish Office

St. Andrew’s House,

Edinburgh

23rd January 1990

Criteria for the classification of waters

The limits set out below are maxima

(1)	(2)		(3)	(4)	(5)
No. in Annex II to 75/440/EEC	Parameters		DW1	DW2	DW3
Note (1) The value is an upper limit set in relation to the mean annual temperature (high and low).
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

Explanatory note

(This note is not part of the Regulations)

These Regulations prescribe the system of classifying the quality of inland waters (as defined in section 30A(5)(b) of the Control of Pollution Act 1974) according to their suitability for abstraction by water authorities for supply (after treatment) as drinking water.

The classifications DW1, DW2 and DW3 reflect the mandatory values assigned by Annex II to Council Directive 75/440/EEC, (OJ No.L 194, 25.7.75, p.26) (concerning the quality required of surface water intended for the abstraction of drinking water) to the parameters listed in the Schedule to the Regulations.

The classifications are relevant for the purposes of setting water quality objectives for rivers, lochs and other inland waters under section 30C of the Act and for ascertaining the treatment to which the water is to be subjected before it is supplied for public use, in accordance with Part VI of the Water Supply (Water Quality) (Scotland) Regulations 1990 (S.I. 1990/119).