"'sewer' means drainage pipes and sewers of every description, including storm water sewers, owned by, vested in or controlled by water services authority, an authorised provider of water services or a person providing water services jointly with or on behalf of a water services authority or an authorised provider of water services, and for the avoidance of doubt, does not include drains to which the words "drain" or "service connection" interpreted in this section apply;".