North Dakota Century Code Title 43. Occupations and Professions § 43-18-16. Plumber licensed by board may practice at any place in state--Exception

A plumber registered and licensed by the board to engage in the business of master plumber, journeyman plumber, or plumber's apprentice may engage in or work at the business of plumbing at any place in this state, except in cities that have adopted ordinances requiring a municipal license or registration in addition to the state license before permitting any plumber to work in such municipality.