Regulation 34 Use of processes
The Department may at any time by notice in writing given to the water undertaker require it to make an application to the Department for approval of the use of any process; and may prohibit it for such period as may be specified in the notice from using any such process in connection with the supply by it of water for regulation 5(1) purposes.
The Department may refuse the application or impose on any approval given for the purposes of this regulation such conditions as it thinks fit and, subject to paragraph (3), may at any time by notice in writing to the water undertaker revoke an approval so given or modify or revoke any condition imposed by virtue of this paragraph.
Subject to paragraph (4), the Department must not—
revoke any approval given for the purposes of this regulation;
modify any condition imposed by virtue of paragraph (2); or
prohibit the water undertaker from using any process, unless it has given to the undertaker at least six months' notice in writing of its intention to revoke, modify or prohibit, as the case may be.
Paragraph (3) shall not apply in any case in which the Department is of the opinion that the immediate revocation, modification or prohibition is necessary in the interests of public health.