As used in this chapter:

(a)  “Check valve” means a mechanical valve that permits gases and liquids to flow in only one direction, preventing process flow from reversing.

(b)  “Dwelling unit” means a structure or portion of a structure providing complete, independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking, and sanitation, and containing a separate means of ingress and egress as defined in subsection 45-24-31(24) of the Rhode Island general laws.

(c)  “New residential construction” means new buildings or portions thereof to be occupied as dwelling units or buildings and portions thereof changed for residential occupancy.

(d)  “Substantially altered sewer connections” means any existing sewer connection that is replaced or expanded for use by a dwelling unit.