N.H. Rev. Stat. Ann. § 485:56

Health officers of the cities and towns of the state, and the department of environmental services, shall examine and inspect the sources from which ice is cut, or is proposed to be cut, for domestic use in such cities and towns, and to employ any necessary means to determine whether the waters of such sources of ice supply have been polluted, or whether ice taken from such sources will be deleterious to the public health.