Water Quality Standards Regulations: New Hampshire

Presented are water quality standards in effect for Clean Water Act (CWA) purposes for this state.

The EPA is posting these standards as a convenience to users and has made a reasonable effort to assure their accuracy. For each document listed under "State Standards in Effect for CWA Purposes", the EPA has made a reasonable effort to identify parts of the standards that are disapproved or are otherwise not in effect for CWA purposes. Additionally, please note the documents may also contain provisions that the EPA does not have the authority and duty to act on under the Clean Water Act because the provisions are not water quality standards.

• State Standards in Effect for CWA Purposes
• Federally Proposed or Promulgated Standards

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State Standards in Effect for CWA Purposes

• Title 50, Water Management and Protection, Chapter 485A, Water Pollution and Waste Disposal (pdf) (678.95 KB)
  State statute addressing protection of water supplies, prevention of pollution in surface and ground waters of the state, and prevention of nuisances and public health hazards.
  Note: This statute includes provisions related to groundwater that are outside the scope of the Clean Water Act and the implementing federal regulations, but are included here as supplementary information.
• Surface Water Quality Regulations, Chapter 1700 (2022) (pdf) (1.68 MB)
  (Effective December 13, 2022) State regulation establishing water quality standards for the state's surface waters. Please note that not all parts of this document are effective for Clean Water Act purposes. Refer to cover pages for more information. The corresponding provisions which are in effect for Clean Water Act Purposes can be found in the 2015 WQS:
  • Surface Water Quality Regulations, Chapter 1700 (2015) (pdf) (383.15 KB)
    (Effective February 13, 2015) Archived state regulation establishing water quality standards for the state's surface waters. Note that these regulations are posted only for reference of previously approved standards. Refer to the cover pages of the 2022 standards for more information.
• Class A Surface Waters in New Hampshire (pdf) (1.51 MB)
  This document provides a listing of the Class A surface waters.

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Federally Proposed or Promulgated Standards

• None at this time.