Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    • Environmental Topics
    • Air
    • Bed Bugs
    • Cancer
    • Chemicals, Toxics, and Pesticide
    • Emergency Response
    • Environmental Information by Location
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Radon
    • Research
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • Our Mission and What We Do
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History

Breadcrumb

  1. Home
  2. NPDES Permits Around the Nation

Region 1 Final Small Wastewater Treatment Facilities General Permit

2021 Final Small Wastewater Treatment Facilities General Permit for Massachusetts and New Hampshire and 2023 Modification

EPA Region 1 has issued the National Pollutant Discharge Elimination System (NPDES) General Permits for the Discharge of Wastewater from Small Wastewater Treatment Facilities (WWTFs) in the Commonwealth of Massachusetts and the State of New Hampshire. General Permit MAG580000 applies to discharges in Massachusetts, and General Permit NHG580000 applies to discharges in New Hampshire. Unless otherwise specified, these two permits are collectively referred to as the "Small Wastewater Treatment Facilities General Permit" ("Small WWTF General Permit" or the "General Permit").

The Small WWTF General Permit is designed to authorize discharges of wastewater from publicly owned treatment works and other treatment works that treat domestic sewage. Facilities eligible for coverage under the General Permit would include those in Massachusetts and New Hampshire with a design flow less than one million gallons per day (MGD). The Small WWTF General Permit replaces the Publicly Owned Treatment Works General Permit (POTW GP) that was effective on July 6, 2011 and expired on July 6, 2016. The Small WWTF General Permit establishes effluent limitations, monitoring requirements, reporting requirements and standard conditions for facilities that discharge to fresh and marine waters in the Commonwealth of Massachusetts and the State of New Hampshire. Specific eligibility and notification requirements are provided for in the General Permit. See Attachment E of the Small WWTF General Permit in the link below for a list of the eligible facilities.

The 2021 Small WWTF General Permit was issued on September 28, 2021 and became effective on December 1, 2021.

From October 27, 2022, through January 25, 2023, a Draft Modification of the Small WWTF General Permit was made available for public review and comment which included several proposed changes and added several newly eligible WWTFs. The 2023 Modified Small WWTF General Permit was issued on March 29, 2023 and will become effective on June 1, 2023.

Newly eligible facilities under the 2023 Modified Small WWTF GP may choose to submit a Notice of Intent (NOI) to EPA in accordance with 40 CFR § 122.28(b)(2)(i) & (ii). The details of such a submittal are outlined in the Part V.A of the 2023 Modified Small WWTF General Permit. As a convenience, eligible facilities may use this NOI template (docx) (24 KB) and submit their NOI electronically to R1NPDESReporting@epa.gov (with copy to Duspiva.Michele@epa.gov) at any time before the deadline of June 27, 2023.

A copy of the Small WWTF General Permit and other relevant documents are posted here:

2023 Modified Small GP Documents

  • 2023 Small WWTF General Permit Modification (pdf) (659 KB)
    • Part VIII – Standard Conditions (pdf) (327 KB)
    • Attachment A – Freshwater Acute Toxicity Test Procedure and Protocol, February 2011 (pdf) (126 KB)
    • Attachment B – Freshwater Chronic Toxicity Test Procedure and Protocol, March 2013 (pdf) (104 KB)
    • Attachment C – Marine Acute Toxicity Test Procedure and Protocol, July 2012 (pdf) (115 KB)
    • Attachment D – Marine Chronic Toxicity Test Procedure and Protocol, November 2013 (pdf) (132 KB)
    • Attachment E – List of Eligible Facilities, March 2023 (pdf) (166 KB)
  • 2023 EPA's Response to Comments (pdf) (505 KB)
  • Massachusetts State Water Quality Certification, dated February 24, 2023 (pdf) (163 KB)
  • New Hampshire State Water Quality Certification, dated February 24, 2023 (pdf) (307 KB)
  • Statement of Basis (Including Appendices A, B, and C) (pdf) (7.2 MB)

2021 Small WWTF GP Documents

  • 2021 Small WWTF General Permit (pdf) (586 KB)
    • Part VIII – Standard Conditions (pdf) (327 KB)
    • Attachment A – Freshwater Acute Toxicity Test Procedure and Protocol, February 2011 (pdf) (126 KB)
    • Attachment B – Freshwater Chronic Toxicity Test Procedure and Protocol, March 2013 (pdf) (104 KB)
    • Attachment C – Marine Acute Toxicity Test Procedure and Protocol, July 2012 (pdf) (115 KB)
    • Attachment D – Marine Chronic Toxicity Test Procedure and Protocol, November 2013 (pdf) (132 KB)
    • Attachment E – List of Eligible Facilities, September 2021 (pdf) (123 KB)
  • EPA's Response to Comments (including Appendices A and B) (pdf) (1.2 MB)
  • Massachusetts State Water Quality Certification, dated June 7, 2021 (pdf) (240 KB)
  • New Hampshire State Water Quality Certification, dated June 4, 2021 (pdf) (231 KB)
  • Small WWTF Fact Sheet (pdf) (933 KB)

All authorizations for the Small WWTF GP are available below for public access.

Authorization Letters for Small Wastewater Treatment Facilities
City/Town (Receiving Water) Applicant/Facility Name Authorization Number Authorization Effective Date
Deerfield (Deerfield River) Old Deerfield WWTP (pdf) (363 KB) MAG580001 04/01/2022
Buckland (Deerfield River) Shelburne Falls WWTF (pdf) (366 KB) MAG580002 04/01/2022
Charlemont (Deerfield River) Charlemont Sewer District WWTP (pdf) (362 KB) MAG580003 04/01/2022
South Deerfield (Connecticut River) South Deerfield WWTP (pdf) (345 KB) MAG580004 04/01/2022
Sunderland (Connecticut River) Sunderland WWTF (pdf) (346 KB) MAG580005 04/01/2022
East Douglas (Blackstone River) Douglas WWTP (pdf) (360 KB) MAG580006 09/01/2023
East Douglas (Mumford River) Douglas Wastewater Treatment Facility (pdf) (370 KB) MAG580006 04/01/2022
Hull (Massachusetts Bay) USCG Boston Light (pdf) (300 KB) MAG580007 04/01/2022
Wrentham (Unnamed Tributary of the Stop River) Wrentham Development Center (pdf) (365 KB) MAG580008 04/01/2022
Concord (Assabet River, Concord River Watershed) MCI - Concord (pdf) (356 KB) MAG580009 09/01/2023
Concord (Assabet River) MCI - Concord (pdf) (367 KB) MAG580009 04/01/2022
Concord (Spencer Brook) Middlesex School (pdf) (372 KB) MAG580010 04/01/2022
Wayland (Sudbury River) Wayland WWTP (pdf) (357 KB) MAG580011 04/01/2022
Gill (Connecticut River) Northfield Mt Hermon School (pdf) (360 KB) MAG580012 04/01/2022
Hadley (Connecticut River) Hadley Indian Hill WWTP (pdf) (362 KB) MAG580013 04/01/2022
Northfield (Connecticut River) Northfield WWTF (pdf) (363 KB) MAG580014 04/01/2022
Hatfield (Connecticut River) Hatfield Wastewater Treatment Plant (pdf) (362 KB) MAG580015 04/01/2022
Gilbertville (Ware River, Connecticut River Watershed) Hardwick-Gilbertville WPCF (pdf) (359 KB) MAG580016 09/01/2023
Gilbertville (Ware River) Hardwick Gilbertville Water Pollution Control Facility (pdf) (370 KB) MAG580016 04/01/2022
Wheelwright (Ware River) Hardwick Wheelwright (pdf) (361 KB) MAG580017 04/01/2022
Barre (Ware River) Barre Wastewater Treatment Plant (pdf) (366 KB) MAG580018 04/01/2022
Monroe Bridge (Deerfield River) Monroe WWTF (pdf) (355 KB) MAG580019 04/01/2022
South Royalston (Millers River) Royalston WWTP (pdf) (361 KB) MAG580020 04/01/2022
Erving (Millers River) Erving POTW #3 (pdf) (342 KB) MAG580021 04/01/2022
Westfield (Westfield River) Renaissance Manor of Westfield (pdf) (360 KB) MAG580022 04/01/2022
Russell (Westfield River) Russell WWTF (pdf) (356 KB) MAG580023 04/01/2022
Huntington (Westfield River, Connecticut River Watershed) Huntington WWTP (pdf) (357 KB) MAG580024 09/01/2023
Huntington (West Branch Westfield River) Huntington Wastewater Treatment Plant (pdf) (370 KB) MAG580024 04/01/2022
Russell (Westfield River) Woronoco Village (pdf) (357 KB) MAG580025 04/01/2022
Oxford (French River, Thames River Watershed) Oxford - Rochdale (pdf) (368 KB) MAG580026 09/01/2023
Oxford (French River) Oxford - Rochdale (pdf) (380 KB) MAG580026 04/01/2022
Leicester (French River) Leicester Water Supply District (pdf) (383 KB) MAG580027 04/01/2022
West Stockbridge (Williams River) West Stockbridge (pdf) (360 KB) MAG580028 04/01/2022
Stockbridge (Housatonic River) Stockbridge WWTP (pdf) (359 KB) MAG580029 04/01/2022
Merrimac (Merrimack River) Merrimac WWTP (pdf) (355 KB) MAG580030 04/01/2022
Gloucester (Massachusetts Bay) Shore Cliff - Deaconess Retirement Home (pdf) (351 KB) MAG580031 04/01/2022
Lincoln (Headwaters Wetland to the Shawsheen River; Shawsheen River Basin) Battle Road Farm Wastewater Treatment Facility (pdf) (365 KB) MAG580032 04/01/2022
Cohasset (Cohasset Cove/Harbor) Cohasset Wastewater Treatment Plant (pdf) (361 KB) MAG580033 04/01/2022
Upton (Unnamed tributary to West River, Blackstone River Watershed) Upton WWTP (pdf) (417 KB) MAG580034 09/01/2023
Hopedale (Mill River, Blackstone River Watershed) Hopedale WWTP (pdf) (412 KB) MAG580035 09/01/2023
Norfolk (Stop River, Charles River Watershed) MCI Norfolk-Walpole WWTF (pdf) (416 KB) MAG580036 09/01/2023
North Brookfield (Forget-Me-Not Brook, Connecticut River Watershed) North Brookfield WWTP (pdf) (412 KB) MAG580037 09/01/2023
Templeton (Otter River, Connecticut River Watershed) Templeton WWTP (pdf) (409 KB) MAG580038 09/01/2023
Charlton (Cady Brook, Quinebaug Watershed) Charlton WWTP (pdf) (416 KB) MAG580039 09/01/2023
Bridgewater (Sawmill Brook, Taunton River Watershed) MCI Bridgewater (pdf) (416 KB) MAG580040 09/01/2023
Middleborough (Taunton River) Oak Point Retirement Community (pdf) (403 KB) MAG580041 09/01/2023
Manchester-By-the-Sea (Manchester Bay, North Coastal) Manchester-by-the-Sea WWTF (pdf) (406 KB) MAG580043 09/01/2023
Rockport (Sandy Bay, North Coastal) Rockport WWTF (pdf) (403 KB) MAG580044 09/01/2023
Troy (South Branch of the Ashuelot River) Troy WWTF (pdf) (387 KB) NHG580001 04/01/2022
Whitefield (Johns River) Whitefield WWTP (pdf) (469 KB) NHG580002 06/01/2022
Whitefield (Johns River) Whitefield WWTP (pdf) (383 KB) NHG580002 04/01/2022
Meriden (Bloods Brook) Meriden Village Water District (pdf) (381 KB) NHG580003 04/01/2022
Bethlehem (Ammonoosuc River) Bethlehem Village WWTP (pdf) (367 KB) NHG580004 04/01/2022
Hillsborough (Contoocook River) Hillsborough WCF (pdf) (374 KB) NHG580005 04/01/2024
Greenville (Souhegan River) Greenville WWTF (pdf) (381 KB) NHG580006 04/01/2022
Warner (Warner River) Warner WWTF (pdf) (370 KB) NHG580007 04/01/2022
Brentwood (Ice Pond Brook) Rockingham County Complex (pdf) (372 KB) NHG580008 03/01/2025
Brentwood (Ice Pond Brook) Rockingham County Complex (pdf) (378 KB) NHG580008 04/01/2022
Rollinsford (Salmon Falls River) Rollinsford (pdf) (368 KB) NHG580009 04/01/2022
Milton (Salmon Falls River) Milton (pdf) (366 KB) NHG580010 04/01/2022
Newfields (Squamscott River) Newfields WWTF (pdf) (362 KB) NHG580011 06/01/2023
Newfields (Squamscott River) Newfields WWTF (pdf) (372 KB) NHG580011 04/01/2022
Epping (Lamprey River) Epping (pdf) (382 KB) NHG580012 04/01/2022
Newmarket (Lamprey River) Newmarket (pdf) (363 KB) NHG580013 06/01/2023
Newmarket (Lamprey River) Newmarket (pdf) (372 KB) NHG580013 04/01/2022
Rye (Atlantic Ocean) Wallis Sands State Park (pdf) (366 KB) NHG580014 09/01/2023
Swanzey (Ashuelot River, Connecticut River Watershed) West Swanzey WWTP (pdf) (371 KB) NHG580015 09/01/2023
Hinsdale (Ashuelot River, Connecticut River Watershed) Hinsdale WWTP (pdf) (371 KB) NHG580016 09/01/2023
Sunapee (Sugar River, Connecticut River Watershed) Sunapee WWTF; Co-permittee: New London Sewer Commission (pdf) (381 KB) NHG580017, NHG58C117 09/01/2023
Henniker (Contoocook River, Merrimack River Watershed) Henniker WWTF (pdf) (362 KB) NHG580018 09/01/2023
Peterborough (Contoocook River, Merrimack River Watershed) Peterborough WWTF (pdf) (384 KB) NHG580019 09/01/2023
North Woodstock (Pemigewasset River, Merrimack River Watershed) Woodstock WWTP (pdf) (365 KB) NHG580020 09/01/2023
Bristol (Pemigewasset River) Town of Bristol WWTF (pdf) (368 KB) NHG580021 04/01/2022
Pittsfield (Suncook River, Merrimack River Watershed) Pittsfield WWTF (pdf) (381 KB) NHG580022 09/01/2023
Farmington (Cocheco River, Piscataqua River Watershed) Farmington WWTP (pdf) (368 KB) NHG580023 09/01/2023
Groveton (Upper Ammonoosuc River) Groveton WWTP (pdf) (373 KB) NHG580226 04/01/2022
Plymouth (Pemigewasset River) Plymouth Village WWTF (pdf) (369 KB) NHG580242 04/01/2022
Colebrook (Connecticut River) Colebrook WWTF (pdf) (367 KB) NHG580315 09/01/2023
Westmoreland (Connecticut River) Cheshire County Complex (pdf) (347 KB) NHG580391 04/01/2022
Winchester (Ashuelot River) Winchester WWTP (pdf) (371 KB) NHG580404 04/01/2022
Lisbon (Ammonoosuc River, Connecticut River Watershed) Town of Lisbon; Co-permittee: Landaff (pdf) (372 KB) NHG580421, NHG58C421 09/01/2023
Lisbon (Ammonoosuc River) Town of Lisbon (pdf) (372 KB) NHG580421 04/01/2022
North Stratford (Connecticut River) Stratford Village System (pdf) (346 KB) NHG580536 04/01/2022
Antrim (Contoocook River) Antrim Water & Sewer Dept (pdf) (369 KB) NHG580561 04/01/2022
Hopkinton (Contoocook River) Town of Hopkinton WWTP (pdf) (368 KB) NHG580579 04/01/2022
Gorham (Androscoggin River) Gorham WWTF (pdf) (368 KB) NHG580927 04/01/2022
Boscawen (Merrimack River) Merrimack County Nursing Home (pdf) (348 KB) NHG580935 04/01/2022
Woodsville (Connecticut River) Woodsville WWTF (pdf) (349 KB) NHG580978 04/01/2022
Newington (Piscataqua River) Town of Newington (pdf) (362 KB) NHG581141 06/01/2023
Newington (Piscataqua River) Town of Newington (pdf) (372 KB) NHG581141 04/01/2022
Northumberland (Connecticut River) Northumberland Village WWTF (pdf) (349 KB) NHG581206 04/01/2022
North Stratford (Connecticut River) Stratford-Mill House (pdf) (347 KB) NHG581214 04/01/2022
Lancaster (Otter Brook) Lancaster Grange WWTP (pdf) (365 KB) NHG581249 04/01/2022
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on February 14, 2025
  • Assistance
  • Spanish
  • Arabic
  • Chinese (simplified)
  • Chinese (traditional)
  • French
  • Haitian Creole
  • Korean
  • Portuguese
  • Russian
  • Tagalog
  • Vietnamese
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data
  • Inspector General
  • Jobs
  • Newsroom
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions
  • Site Feedback

Follow.