RSA 149-I:1: Construction.

The mayor and aldermen of any city may construct and maintain all main drains or common sewers, stormwater treatment, conveyance, and discharge systems, sewage and/or waste treatment, works which they adjudge necessary for the public convenience, health or welfare. Such drains, sewers, and systems shall be substantially constructed of brick, stone, cement, or other material adapted to the purpose, and shall be the property of the city.