Without prejudice to the provisions of Part II of this Act, no person shall pass or permit to be passed into, or into a drain connecting with, a public sewer F1 , public SUD system or public sewage treatment works any matter or substance which, either alone or in combination with any matter or substance with which it is likely to come into contact while passing through any sewer F2 , SUD system or works, is likely to injure the sewer F2 , SUD system or works, or to interfere with the free flow of their contents, or to affect prejudicially the treatment or disposal of their contents or to be prejudicial to health:

A person who contravenes any of the provisions of this section shall be guilty of an offence and liable on summary conviction to F3imprisonment for a term not exceeding 12 months or a fine not exceeding £40,000 (or both) F4and on conviction on indictment, to a fine or to imprisonment for a term not exceeding two years or to both a fine and such imprisonment.

This section does not apply in relation to the passing of fat, oil or grease from trade premises into a public sewer or a drain connecting with such a sewer.