Rockwood - Subject to local approval, establishes additional qualifications for service as a member of the city's board of waterworks, sewerage, and natural gas by requiring one member to be on the city council, members to be property holders in their places of residence, and members to reside within their respective cities or unincorporated areas for one (1) year preceding their appointment; establishes terms of service for board members; and establishes a procedure for filling vacancies on the board. - Amends Chapter 231 of the Private Acts of 1980.