70:1 Ambient Groundwater Quality Standards. Amend RSA 485-C:6, I to read as follows:

I. The commissioner shall establish and adopt ambient groundwater quality standards for regulated contaminants which adversely affect human health or the environment. Ambient groundwater standards shall apply to all regulated contaminants which result from human operations or activities, but do not apply to naturally occurring contaminants. Where state maximum contaminant levels have been adopted under RSA 485:3, I(b), or established in law, ambient groundwater quality standards shall be equivalent to such standards. where federal maximum contaminant level or health advisories have been promulgated under the Federal Safe Drinking Water Act or rules relevant to such act, ambient groundwater quality standards shall be no less stringent than such standards. The commissioner may adopt standards more stringent than federal maximum contaminant levels or health advisories if, accounting for an adequate margin of safety to protect human health at all life stages, including but not limited to pre-natal development, the commissioner determines federal standards are insufficient for protection of human health. Where such standards are established based upon health advisories that address cancer risks, the ambient groundwater quality standards shall be equivalent to that exposure which causes a lifetime exposure risk of one cancer in 1,000,000 exposed population. Where no federal or state maximum contaminant level or health advisory has been issued , the commissioner may adopt ambient groundwater quality standards on a basis which provides for an adequate margin of safety to protect human health and safety.

70:2 Effective Date. This act shall take effect upon its passage.

Approved: June 07, 2023

Effective Date: June 07, 2023

70:1 Ambient Groundwater Quality Standards. Amend RSA 485-C:6, I to read as follows:

I. The commissioner shall establish and adopt ambient groundwater quality standards for regulated contaminants which adversely affect human health or the environment. Ambient groundwater standards shall apply to all regulated contaminants which result from human operations or activities, but do not apply to naturally occurring contaminants. Where state maximum contaminant levels have been adopted under RSA 485:3, I(b), or established in law, ambient groundwater quality standards shall be equivalent to such standardsshall be no less stringent thanestablishedissued adopted* , the commissioner may adopt ambient groundwater quality standards on a basis which provides for an adequate margin of safety to protect human health and safety.

70:2 Effective Date. This act shall take effect upon its passage.

Approved: June 07, 2023

Effective Date: June 07, 2023