N.H. Rev. Stat. Ann. § 154:30-f

Municipalities belonging to such a system may raise and appropriate money for the purpose of the system. Counties in which a system is established may raise and appropriate money for the purposes of the system; provided however that where all the municipalities in the county do not belong to the system, such county appropriations may only be made by the affirmative vote of 2/3 majority of the county convention present and voting.