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Discharge permits in New Hampshire

55 active individual NPDES permits with limits in EPA's file of Oct 22, 2026.

By industry

• Electric Services 6

Sewage treatment plants (31)

• Ashland Town of NH0100005 · major
• Allenstown W W T F NH0101390
• Berlin P C F NH0100013 · major
• Charlestown W W T P NH0100765 · major
• City of Concord NH0100331 · major
• Claremont W W T F NH0101257 · major
• Concord-Hall Street City of NH0100901 · major
• Derry W W T P NH0100056 · major
• Dover City of WWTP NH0101311 · major
• Durham W W T F NH0100455 · major
• Exeter Town of NH0100871 · major
• Hampton W W T P NH0100625 · major
• Hooksett W W T F NH0100129 · major
• Hanover, Town of NH0100099
• Jaffrey Town of NH0100595 · major
• Keene City of NH0100790 · major
• Lancaster W W T F NH0100145 · major
• Lebanon W W T F NH0100366 · major
• Littleton Town of NH0100153 · major
• Manchester City of NH0100447 · major
• Merrimack W W T F NH0100161 · major
• Milford Town of NH0100471 · major
• Nashua City of NH0100170 · major
• Newport Town of NH0100200 · major
• Pease W W T F NH0109000
• Portsmouth-Pierce City of NH0100234 · major
• Rochester, Town of NH0100668 · major
• Seabrook NH0101303 · major
• Somersworth W P C F NH0100277 · major
• Waterville Valley Advanced W W T F NH0100781 · major
• Winnipesaukee River Basin NH0100960 · major

Industrial and other (24)

• Aquatic Research Organisms Inc NH0022985 · Testing Laboratories
• Alcara Meters LLC NH0023558 · Transformers, Except Electronic
• Bridgewater Power Company NH0022021 · major · Electric Services
• Forbes Farm Partnership NH0023540 · Dairy Farms
• Granite Shore Power Merrimack LLC NH0001465 · major · Electric Services
• GSP Schiller LLC NH0001473 · major · Electric Services
• Gorham Acquisitions, LLC NH0000655 · major · Pulp Mills
• Lincoln W W T P NH0100706 · major · Water Supply
• Little Bay Seafood LLC. NH0020923 · Fresh Or Frozen Prepared Fish
• Manchester Water Works, City of Manchester NH0001621 · Water Supply
• Monadnock Paper Mills, Inc. NH0000230 · major · Paper Mills
• Moultonborough, Town of NHC110960
• New Castle Dept of Public Works NHC010234
• Newington Power Facility NH0023361 · major · Electric Services
• NH Fish Game-Berlin Fish Hat NH0000621 · Fish Hatcheries And Preserves
• NH FISH and GAME POWDER MILL FIS NH0000710 · Fish Hatcheries And Preserves
• Nylon Corporation of America NH0000116 · Plastics Materials And Resins
• NextEra Energy Seabrook LLc NH0020338 · major · Electric Services
• P S N H - Newington Station NH0001601 · major · Electric Services
• PCC Structurals Inc NH0001023 · major · Aluminum Foundries
• Pease Development Authority NH0090000 · major · National Security
• Star Island Treatment Facility NH0101028 · Nonresidential Building Operators
• SubCom Cable System, LLC NH0001490 · Nonferrous Wiredrawing & Insulating
• U.S.Army-Cold Region Research NH0001619 · National Security

Source: EPA ECHO, Oct 22, 2026. As JSON: /api/v1/permits?state=NH · MCP: https://passage-data.com/mcp · All states