It shall be the duty of every sewerage undertaker—
to provide, improve and extend such a system of public sewers (whether inside its area or elsewhere) and so to cleanse and maintain those sewers and any lateral drains which belong to or vest in the undertaker as to ensure that that area is and continues to be effectually drained; and
to make provision for the emptying of those sewers and such further provision (whether inside its area or elsewhere) as is necessary from time to time for effectually dealing, by means of sewage disposal works or otherwise, with the contents of those sewers.
It shall be the duty of a sewerage undertaker in performing its duty under subsection (1) above to have regard—
to its existing and likely future obligations to allow for the discharge of trade effluent into its public sewers; and
to the need to provide for the disposal of trade effluent which is so discharged.
The duty of a sewerage undertaker under subsection (1) above shall be enforceable under section 18 above—
by the Secretary of State; or
with the consent of or in accordance with a general authorisation given by the Secretary of State, by the Authority.
The obligations imposed on a sewerage undertaker by the following Chapters of this Part, and the remedies available in respect of contraventions of those obligations, shall be in addition to any duty imposed or remedy available by virtue of any provision of this section or section 95 below and shall not be in any way qualified by any such provision.
In this section "trade effluent" has the same meaning as in Chapter III of this Part.