23.—(1) In carrying out such of its functions under Part II of the Act as comprise the supply of water for drinking, washing or cooking, a water authority shall not supply water from any source which consists of or includes raw water unless the water has been disinfected and, in the case of surface water, subjected to at least such further treatment as is specified in paragraph (2):
Provided that this paragraph shall not require an authority to disinfect water from such ground water source as is specified in an authorisation given by the Secretary of State for the purposes of this paragraph.
(2) The further treatment mentioned in paragraph (1) is such treatment as is required to secure compliance with Council Directive 75/440/EEC (quality required of surface water intended for the abstraction of drinking water) ((1)); and for the purposes of this regulation, surface water shall be treated as falling within category A1 or A2 or A3 set out in Annex I to that Directive if it is abstracted from waters for which the classification to be currently satisfied in accordance with section 30C(1) of the Control of Pollution Act 1974((2)) is, as appropriate, DW1 or DW2 or DW3, as set out in the Surface Waters (Classification) (Scotland) Regulations 1990((3)).
(3) Until such time as a notice under section 30C(1) of the said Act is served in relation to any waters, those waters shall for the purposes of this regulation be treated as falling within the category A1 or A2 or A3 if the waters were classified as being of that category by a water authority before the making of these Regulations and that classification is notified to the Secretary of State before these Regulations come into force.
(4) Except with the consent of the Secretary of State, water shall not be abstracted for supply for domestic purposes which include drinking except from waters to be treated as falling within category A1 or A2 or A3 in the Annex.
OJ No. L194, 25.7.1975, p.26.
1974 c. 40; section 30C was added by the Water Act 1989 (c. 15), Schedule 23, paragraph 4.