Dischargers

Sewer operators and treatment plants whose discharges we track, by state. Each page lists the permit, the outfalls, how the operator tells the public, and every report.

Source: the project's research per state and EPA ECHO permits (dischargers.json), with event counts from the tracked records as of 2026-11-02 11:56 UTC.

Connecticut

• Borough of Naugatuck WPCF · CT0100641 · 0 outfalls · 71 discharges tracked, latest Aug 13, 2026
• City of Bridgeport WPCA - East Side WPCF (Seaview Ave) and East Side combined sewers · CT0101010 · 6 outfalls · 651 discharges tracked, latest Oct 11, 2026
• City of Bridgeport WPCA - West Side WPCF (Bostwick Ave) and West Side combined sewers · CT0100056 · 26 outfalls · 2,193 discharges tracked, latest Oct 12, 2026
• City of Derby WPCF · CT0100161 · 0 outfalls · 65 discharges tracked, latest May 19, 2026
• City of Middletown WPCF · CT0100323 · 0 outfalls · 41 discharges tracked, latest Oct 4, 2021
• City of New London WPCF · CT0100382 · 0 outfalls · 0 discharges tracked
• City of Norwalk WPCA (Norwalk WPCF) - NPDES permitted secondary-treatment bypass and Ann Street Siphon emergency overflow · CT0101249 · 0 outfalls · 333 discharges tracked, latest Sep 13, 2026
• City of Shelton WPCF · CT0100714 · 0 outfalls · 24 discharges tracked, latest Jan 29, 2026
• City of Waterbury WPCF · CT0100625 · 1 outfall · 334 discharges tracked, latest Oct 28, 2026
• Greater New Haven Water Pollution Control Authority (East Shore WPAF) · CT0100366 · 11 outfalls · 3,429 discharges tracked, latest Oct 16, 2026
• Jewett City WPCA (Griswold) · CT0100269 · 0 outfalls · 0 discharges tracked
• Mattabassett District WPCF (Cromwell; serves Berlin, Cromwell, New Britain, Middletown portions) · CT0100307 · 0 outfalls · 0 discharges tracked
• MDC collection system in West Hartford / Newington (sanitary overflows to Piper Brook, Trout Brook) · permit not recorded · 0 outfalls · 0 discharges tracked
• Norwich Public Utilities (City of Norwich WPCF) · CT0100412 · 13 outfalls · 4,036 discharges tracked, latest Oct 16, 2026
• Stamford WPCA (Stamford WPCF) · CT0101087 · 0 outfalls · 84 discharges tracked, latest Sep 13, 2026
• The Metropolitan District (MDC) - Hartford Water Pollution Control Facility and combined sewer system · CT0100251 · 38 outfalls · 1,642 discharges tracked, latest Oct 16, 2026
• Town of East Windsor WPCA · CT0100196 · 0 outfalls · 24 discharges tracked, latest Aug 17, 2026
• Town of Greenwich Grass Island WPCF · CT0100234 · 0 outfalls · 150 discharges tracked, latest Oct 2, 2026
• Town of Groton WPCF and collection system · CT0100242 · 0 outfalls · 0 discharges tracked
• Town of Plainville WPCF · CT0100455 · 0 outfalls · 2 discharges tracked, latest Oct 30, 2026
• Town of Stratford WPCF · CT0101036 · 0 outfalls · 44 discharges tracked, latest Oct 14, 2026
• Town of Westport WPCF and pump stations · CT0100684 · 0 outfalls · 30 discharges tracked, latest Sep 13, 2026

Maine

• Auburn Sewerage District · ME0100005 · 1 outfall · 0 discharges tracked
• Cape Elizabeth - Ottawa Road Pump Station (co-permittees South Portland, PWD, Cape Elizabeth) · ME0102806 · 0 outfalls · 0 discharges tracked
• City of Bangor (Wastewater Treatment Plant) · ME0100781 · 9 outfalls · 0 discharges tracked
• City of Bath Water Pollution Control · ME0100021 · 4 outfalls · 0 discharges tracked
• City of Belfast WWTP · ME0101532 · 2 outfalls · 0 discharges tracked
• City of Biddeford WWTF · ME0100048 · 7 outfalls · 0 discharges tracked
• City of Brewer WWTP · ME0100072 · 4 outfalls · 0 discharges tracked
• City of Calais WWTP · ME0100129 · 5 outfalls · 0 discharges tracked
• City of Gardiner WWTF · ME0101702 · 1 outfall · 0 discharges tracked
• City of Lewiston · ME0100994 · 11 outfalls · 0 discharges tracked
• City of Old Town Pollution Control Facility · ME0100471 · 3 outfalls · 0 discharges tracked
• City of Portland (Department of Public Works / Water Resources) · ME0101435 · 12 outfalls · 0 discharges tracked
• City of Rockland WWTF · ME0100595 · 5 outfalls · 0 discharges tracked
• City of Saco Water Resource Recovery Facility · ME0101117 · 4 outfalls · 0 discharges tracked
• City of South Portland Water Resource Protection · ME0100633 · 6 outfalls · 0 discharges tracked
• Greater Augusta Utility District (incl. Hallowell sanitary sewers and CSO) · ME0100013 · 19 outfalls · 0 discharges tracked
• Kennebec Sanitary Treatment District (KSTD) · ME0100854 · 3 outfalls · 0 discharges tracked
• Lewiston-Auburn Clean Water Authority (LACWA, formerly LAWPCA) · ME0101478 · 0 outfalls · 0 discharges tracked
• Mechanic Falls Sanitary District · ME0100391 · 2 outfalls · 0 discharges tracked
• Paris Utility District · ME0100951 · 1 outfall · 0 discharges tracked
• Portland Water District (Portland CSOs and East End WWTF) · ME0102075 · 21 outfalls · 0 discharges tracked
• Town of Bar Harbor - Hulls Cove WWTF · ME0102466 · 0 outfalls · 0 discharges tracked
• Town of Bar Harbor - Main WWTP · ME0101214 · 3 outfalls · 0 discharges tracked
• Town of Bucksport · ME0100111 · 1 outfall · 0 discharges tracked
• Town of Hampden · ME0102512 · 0 outfalls · 0 discharges tracked
• Town of Machias WWTF · ME0100323 · 2 outfalls · 0 discharges tracked
• Town of Madawaska · ME0101681 · 3 outfalls · 0 discharges tracked
• Town of Milford · ME0102695 · 1 outfall · 0 discharges tracked
• Town of Orono WPCF · ME0100498 · 1 outfall · 0 discharges tracked
• Town of Randolph · ME0102423 · 0 outfalls · 0 discharges tracked
• Town of Skowhegan WWTP · ME0100625 · 5 outfalls · 0 discharges tracked
• Town of Winslow · ME0102628 · 1 outfall · 0 discharges tracked
• Westbrook (Portland Water District Westbrook WWTF) · ME0100846 · 5 outfalls · 0 discharges tracked
• Winterport Water District (formerly Winterport Sewerage District) · ME0100749 · 1 outfall · 0 discharges tracked

Massachusetts

• Agawam Department of Public Works · permit not recorded · 0 outfalls · 0 discharges tracked
• Amesbury Water Pollution Abatement Plant · MA0101745 · 0 outfalls · 28 discharges tracked, latest Jan 28, 2026
• Amherst Wastewater Treatment Plant · MA0100218 · 0 outfalls · 3 discharges tracked, latest Sep 29, 2023
• Attleboro Wastewater Treatment Facility · MA0100595 · 0 outfalls · 167 discharges tracked, latest Mar 17, 2026
• Billerica Wastewater Treatment Facility · MA0101711 · 0 outfalls · 185 discharges tracked, latest Apr 3, 2025
• Boston Water and Sewer Commission · MA0101192 · 29 outfalls · 350 discharges tracked, latest Oct 11, 2026
• City of Cambridge DPW · MA0101974 · 7 outfalls · 135 discharges tracked, latest Oct 11, 2026
• City of Chelsea · MA0101877 · 3 outfalls · 50 discharges tracked, latest Oct 11, 2026
• City of Chicopee (Water Pollution Control) · MA0101508 · 18 outfalls · 983 discharges tracked, latest Aug 31, 2026
• City of Fall River (Sewer Commission) · MA0100382 · 19 outfalls · 1,821 discharges tracked, latest Oct 11, 2026
• City of Fitchburg · MA0100986 · 33 outfalls · 379 discharges tracked, latest Oct 11, 2026
• City of Gloucester · MA0100625 · 4 outfalls · 42 discharges tracked, latest May 3, 2026
• City of Haverhill Wastewater Department · MA0101621 · 13 outfalls · 509 discharges tracked, latest Oct 16, 2026
• City of Holyoke (Water Pollution Control / DPW; Veolia contract operator) · MA0101630 · 12 outfalls · 1,763 discharges tracked, latest Oct 16, 2026
• City of New Bedford DPI · MA0100781 · 27 outfalls · 2,200 discharges tracked, latest Oct 17, 2026
• City of Revere · permit not recorded · 0 outfalls · 0 discharges tracked
• City of Somerville DPW · MA0101982 · 2 outfalls · 57 discharges tracked, latest Oct 11, 2026
• City of Taunton · MA0100897 · 1 outfall · 11 discharges tracked, latest Apr 11, 2024
• City of Worcester (Quinsigamond Avenue CSO treatment facility) · MA0102997 · 1 outfall · 97 discharges tracked, latest Oct 11, 2026
• Easthampton Wastewater Treatment Plant · MA0101478 · 0 outfalls · 1 discharge tracked, latest May 10, 2023
• Greater Lawrence Sanitary District · MA0100447 · 5 outfalls · 87 discharges tracked, latest Jul 30, 2026
• Greenfield Water Pollution Control Facility · MA0101214 · 0 outfalls · 14 discharges tracked, latest May 17, 2026
• Longmeadow Department of Public Works · permit not recorded · 0 outfalls · 0 discharges tracked
• Lowell Regional Wastewater Utility · MA0100633 · 9 outfalls · 863 discharges tracked, latest Oct 16, 2026
• Lynn Water and Sewer Commission · MA0100552 · 4 outfalls · 334 discharges tracked, latest Oct 14, 2026
• Massachusetts Water Resources Authority · MA0103284 · 11 outfalls · 331 discharges tracked, latest Oct 12, 2026
• Rockland Wastewater Treatment Facility · MA0101923 · 0 outfalls · 9 discharges tracked, latest Apr 7, 2024
• South Essex Sewerage District · MA0100501 · 0 outfalls · 7 discharges tracked, latest Jan 10, 2024
• Springfield Water and Sewer Commission · MA0101613 · 23 outfalls · 2,050 discharges tracked, latest Oct 16, 2026
• Town of Braintree · permit not recorded · 0 outfalls · 0 discharges tracked
• Town of Montague (Water Pollution Control Facility, Turners Falls) · MA0100137 · 2 outfalls · 168 discharges tracked, latest Aug 3, 2026
• Upper Blackstone Clean Water (Upper Blackstone Water Pollution Abatement District) · MA0102369 · 0 outfalls · 6 discharges tracked, latest Jan 10, 2024
• West Springfield Department of Public Works · permit not recorded · 0 outfalls · 0 discharges tracked

New Hampshire

• City of Berlin Pollution Control Facility (10 Shelby St) and CSO 002 · NH0100013 · 1 outfall · 0 discharges tracked
• City of Lebanon WWTF (CSOs eliminated) · NH0100366 · 4 outfalls · 1 discharge tracked, latest Jul 12, 2025
• City of Manchester DPW Environmental Protection Division (Manchester WWTF, 300 Winston St, and 15 CSOs) · NH0100447 · 15 outfalls · 10 discharges tracked, latest Oct 18, 2026
• City of Nashua Division of Public Works, Wastewater Department (Nashua WWTF, Sawmill Rd, and 9 CSOs) · NH0100170 · 9 outfalls · 731 discharges tracked, latest Aug 3, 2026
• City of Portsmouth DPW Wastewater Division (Peirce Island WWTF and 3 CSOs) · NH0100234 · 4 outfalls · 188 discharges tracked, latest Dec 30, 2025
• NH Medium WWTF General Permit facilities (21 POTWs) - SSO/unauthorized discharge web notices · NHG590000 · 0 outfalls · 0 discharges tracked
• Town of Exeter DPW (Exeter WWTP, 13 Newfields Rd, and CSO 003) · NH0100871 · 1 outfall · 45 discharges tracked, latest Sep 17, 2026

Rhode Island

• Bristol Wastewater Treatment Facility (Town of Bristol) · RI0100005 · 0 outfalls · 17 discharges tracked, latest Sep 14, 2026
• Burrillville Wastewater Treatment Facility · RI0100455 · 0 outfalls · 0 discharges tracked
• City of Central Falls local sewers (combined; CSO outfalls permitted to NBC) · permit not recorded · 0 outfalls · 0 discharges tracked
• City of Newport Utilities - Water Pollution Control (WPCF and two CSO treatment facilities) · RI0100293 · 3 outfalls · 4 discharges tracked, latest Mar 6, 2026
• City of Pawtucket local sewers (combined; CSO outfalls permitted to NBC) · permit not recorded · 0 outfalls · 0 discharges tracked
• Cranston Water Pollution Control Facility (operated by Veolia) · RI0100013 · 0 outfalls · 0 discharges tracked
• Dr. U.E. Zambarano Memorial Hospital wastewater system · RI0100129 · 0 outfalls · 2 discharges tracked, latest Mar 14, 2026
• East Greenwich Wastewater Treatment Facility · RI0100030 · 0 outfalls · 5 discharges tracked, latest Mar 17, 2026
• East Providence Wastewater Treatment Facility (City of East Providence) · RI0100048 · 0 outfalls · 5 discharges tracked, latest May 4, 2026
• Jamestown Wastewater Treatment Facility · RI0100366 · 0 outfalls · 0 discharges tracked
• Local collection systems tributary to NBC (Providence, North Providence, Johnston, Lincoln, Cumberland, East Providence part, Cranston part, Smithfield part) · permit not recorded · 0 outfalls · 0 discharges tracked
• Narragansett Bay Commission - Bucklin Point WWTF and associated CSOs · RI0100072 · 27 outfalls · 9 discharges tracked, latest Oct 5, 2026
• Narragansett Bay Commission - Field's Point WWTF and associated CSOs · RI0100315 · 38 outfalls · 2 discharges tracked, latest Jul 27, 2025
• New Shoreham Water Pollution Control Facility (Block Island) · RI0100196 · 0 outfalls · 0 discharges tracked
• North Kingstown collection system (to Quonset WWTF) · permit not recorded · 0 outfalls · 0 discharges tracked
• Quonset Point Wastewater Treatment Facility (Quonset Development Corporation) · RI0100404 · 0 outfalls · 0 discharges tracked
• Scarborough Wastewater Treatment Facility (Town of Narragansett) · RI0100188 · 0 outfalls · 0 discharges tracked
• Smithfield Wastewater Treatment Plant (Veolia) · RI0100251 · 0 outfalls · 0 discharges tracked
• South Kingstown Regional Wastewater Treatment Facility · RI0100374 · 0 outfalls · 1 discharge tracked, latest May 15, 2024
• Town of Middletown collection system (to Newport WPCF) · permit not recorded · 0 outfalls · 0 discharges tracked
• Warren Wastewater Treatment Facility (Town of Warren) · RI0100056 · 0 outfalls · 1 discharge tracked, latest May 8, 2025
• Warwick Wastewater Treatment Facility (Warwick Sewer Authority) · RI0100234 · 0 outfalls · 0 discharges tracked
• West Warwick Regional Wastewater Treatment Facility · RI0100153 · 0 outfalls · 3 discharges tracked, latest Apr 10, 2026
• Westerly Wastewater Treatment Facility · RI0100064 · 0 outfalls · 7 discharges tracked, latest Jun 6, 2024
• Woonsocket Regional Wastewater Treatment Facility · RI0100111 · 0 outfalls · 3 discharges tracked, latest Jul 1, 2025

Vermont

• Burlington East ('Burlington River') WWTF, Riverside Ave CSO · VT0100307 · 0 outfalls · 14 discharges tracked, latest Jun 10, 2026
• Burlington Main WWTF combined sewer system (City of Burlington DPW Water Resources) · VT0100153 · 6 outfalls · 107 discharges tracked, latest Aug 10, 2026
• Burlington North WWTF combined sewer (Gazo Ave CSO) · VT0100226 · 1 outfall · 20 discharges tracked, latest Jun 20, 2024
• City of Barre collection system (SSO-prone) · VT0100889 · 0 outfalls · 15 discharges tracked, latest Jun 6, 2026
• City of Montpelier Water Resource Recovery Facility combined sewer system · VT0100196 · 13 outfalls · 314 discharges tracked, latest Jun 20, 2026
• City of Newport WWTF combined sewer overflows · VT0100200 · 6 outfalls · 14 discharges tracked, latest May 5, 2025
• City of Rutland WWTF combined sewer system · VT0100871 · 8 outfalls · 776 discharges tracked, latest Sep 9, 2026
• City of St. Albans WWTF, Lower Weldon (Welden) Street CSO · VT0100323 · 0 outfalls · 69 discharges tracked, latest Aug 10, 2026
• City of Vergennes, Macdonough Drive Pump Station overflow (CSO #002) · VT0100404 · 4 outfalls · 82 discharges tracked, latest Jun 18, 2026
• Town of Brattleboro WWTF and collection system · VT0100064 · 0 outfalls · 16 discharges tracked, latest Jul 21, 2026
• Town of Hartford, Quechee WWTF (bypass) · VT0100978 · 0 outfalls · 15 discharges tracked, latest Aug 21, 2026
• Town of Hartford, White River Junction WWTF CSOs · VT0101010 · 7 outfalls · 10 discharges tracked, latest Oct 23, 2026
• Town of Middlebury pump-station overflows (permit-listed CSO outfalls) · VT0100188 · 4 outfalls · 75 discharges tracked, latest Sep 9, 2026
• Town of Northfield WWTF, East St CSO · VT0100242 · 1 outfall · 18 discharges tracked, latest Aug 4, 2020
• Town of Proctor WWTF (bypass/SSO) · VT0100528 · 0 outfalls · 9 discharges tracked, latest Dec 23, 2025
• Town of St. Johnsbury WWTF combined sewer system · VT0100579 · 25 outfalls · 275 discharges tracked, latest Oct 13, 2026
• Town of Windsor Main WWTF (bypass) · VT0100919 · 1 outfall · 6 discharges tracked, latest Nov 6, 2025
• Village of Enosburg Falls, Route 108 Bridge CSO · VT0100102 · 0 outfalls · 3 discharges tracked, latest Jul 21, 2023