N.H. Rev. Stat. Ann. § 482-B:17

The provisions of this chapter shall not apply to a person who regularly employs a maintenance person whose duties include replacement and maintenance of pump installations on the property of that person when such employee is actually so engaged or to an owner or an owner's agent who does pump installation repairs or replacement on property owned by him or her; provided, however, that said repairs, replacements, and maintenance shall conform to rules relative to such repairs, replacements, and maintenance adopted by the board.