RSA 485-A:30-b Protective Well Radii.

I. All lots on which wastewater is or will be disposed on-site and all lots on which a private well exists or will be installed, including lots created prior to August 20, 1989, shall be subject to the following conditions:
(a) Rules adopted under this section concerning such lots shall include provisions allowing abutting lot owners to overlap their respective well radii for their mutual benefit and provisions allowing well radii to extend over property lines onto state and locally-mandated property line setbacks, recorded easements, or land which is permanently dedicated to a use which precludes development.
(b)(1) For any private well being installed or utilized to serve one or more new commercial buildings or a non-community public water system, the entire protective