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Discharge permits in Connecticut
149 active individual NPDES permits with limits in EPA's file of Oct 22, 2026.
By industry
Sewage treatment plants (83)
- Ansonia Wpca, City of CT0100013 · major
- Beacon Falls WPCF CT0101061
- Branford WPCF CT0100048 · major
- Bridgeport-East Side WPCF CT0101010 · major
- Bridgeport-West Wpca CT0100056 · major
- Bristol WPCF CT0100374 · major
- Canaan Fire District CT0100064
- Canton WPCF CT0100072
- Cheshire WPCF CT0100081 · major
- City of Stamford CT0101087 · major
- Convent of the Sacred Heart School CT0101818
- Danbury WPCF CT0100145 · major
- Deep River Town of CT0101745
- Derby WPCF, City of CT0100161 · major
- East Haddam WPCF CT0101761
- East Hampton Wpca CT0024694 · major
- East Hartford WPCF (MDC) CT0100170 · major
- East Windsor WPCF CT0100196 · major
- Enfield Potw, Town of CT0100200 · major
- Fairfield WPCF CT0101044 · major
- Farmington WPCF CT0100218 · major
- Glastonbury WPCF CT0100226 · major
- Groton Wpca, City of CT0101184 · major
- Groton WPCF Town of CT0100242 · major
- Hartford MDC WPCF CT0100251 · major
- Housatonic WPCF CT0101656 · major
- Jewett City Wpca CT0100269 · major
- Killingly WPCF Town of CT0101257 · major
- Ledyard Water Pollution CT0101681
- Litchfield WPCF CT0100803
- Mattabassett District Cromwell CT0100307 · major
- Meriden WPCF CT0100315 · major
- Milford-Beaver Brook WPCP CT0100749 · major
- Montville Wpca CT0100935 · major
- Naugatuck WPCF CT0100641 · major
- New Canaan STP CT0101273 · major
- New Hartford WPCF CT0100331
- New Haven East Shore WPCF CT0100366 · major
- New London STP CT0100382 · major
- New Milford WPCF, Town of CT0100391 · major
- Newtown W P C F CT0101788
- Norfolk Sewer District CT0101231
- North Haven WPCF CT0100404 · major
- Norwalk WPCF CT0101249 · major
- Norwich WPCF CT0100412 · major
- Plainfield North WPCF CT0100447 · major
- Plainfield Village STP CT0100439
- Plainville WPCF CT0100455 · major
- Plymouth WPCF CT0100463 · major
- Poquonock MDC WPCF CT0100994 · major
- Portland WPCF CT0101150 · major
- Putnam Wpca CT0100960 · major
- Redding, Town of CT0101770
- Ridgefield, Town of (Main) CT0100854 · major
- Rocky Hill WPCF CT0100480 · major
- Round Hill Club CT0100986
- Salisbury, Town of CT0100498
- Seymour WPCF, Town of CT0100501 · major
- Sharon WPCF CT0101052
- Shelton, City of CT0100714 · major
- Simsbury WPCF CT0100919 · major
- Somersville WPCF CT0101605
- South Windsor WPCF CT0100510 · major
- Southington WPCF CT0100536 · major
- Sprague WWTP CT0100978
- Stafford WPCF CT0101214 · major
- Stonington-Borough WPCF CT0101281
- Stonington-Mystic WPCF CT0100544
- Stonington-Pawcatuck WPCF CT0101290 · major
- Stratford WPCF CT0101036 · major
- Suffield WPCF CT0100552 · major
- Thomaston WPCF CT0100781 · major
- Thompson WPCF CT0100706 · major
- Torrington WPCF CT0100579 · major
- Town of Manchester CT0100293 · major
- Vernon WPCF CT0100609 · major
- Wallingford WPCF CT0100617 · major
- Waterbury WPCF CT0100625 · major
- West Haven WPCF CT0101079 · major
- Westport WPCF CT0100684 · major
- Winchester WPCF/Winsted WPCF CT0101222 · major
- Windham Town of CT0101001 · major
- Windsor Locks WPCF CT0101591 · major
Industrial and other (66)
- Ahlstrom Nonwovens LLC CT0000434 · major · Paper Mills
- Ahlstrom Nonwovens, LLC CT0026476 · Paper Mills
- Allnex USA Incorporated CT0000086 · major · Plastics Materials And Resins
- Bridgeport Energy LLC CT0030180 · major · Electric Services
- Bridgeport Harbor 1-4 LLC CT0003778 · major · Electric Services
- Brunswick School, Inc. CT0020800
- Connecticut Galvanizing, Div. of Highway Safety Corp CT0030449 · Metal Coating And Allied Services
- City of Stamford CT0030279 · Combination Utilities
- DEVON POWER LLC c/o EASTERN GENERATION LLC CT0003107 · major · Electric Services
- Dunn Paper - East Hartford, LLC CT0002127 · major · Converted Paper Products
- Electric Boat Corporation CT0003824 · major · Ship Building And Repairing
- Fairview Country Club CT0101354 · Public Golf Courses
- Firstlight CT Housatonic LLC CT0030228 · Electric Services
- Firstlight CT Housatonic LLC CT0030287 · Electric Services
- Firstlight CT Housatonic LLC CT0030806 · Electric Services
- Firstlight CT Housatonic LLC CT0030821
- Firstlight CT Hydro LLC CT0030812
- Firstlight CT Hydro LLC CT0030815
- Fort Hill Farms, LLC CT0030800
- Firstlight CT Housatonic LLC CT0030803
- Firstlight CT Housatonic LLC CT0030809
- GB II CT LLC CT0003760 · major · Electric Services
- Greenwich American Centre Inc CT0030295 · Computer Programming Services
- Greenwich WPCF CT0100234 · major
- Hartford Steam Co. CT0004014 · major · Steam And Air-Conditioning Supply
- Haynes Materials Company CT0030678
- Heritage Village Company CT0101133 · Dwelling Operators, Except Apartments
- Hyponex Corporation CT0030431 · Soil Preparation Services
- Hytone Farm LLC CT0030818
- Haynes Materials Company CT0030465 · Dimension Stone
- Kimberly-Clark Corporation CT0003212 · major · Sanitary Paper Products
- King Industries * CT0000841 · Industrial Organic Chemicals
- Leidos Renewable Energy, LLC CT0030473 · Electric Services
- Marianapolis Preparatory SCH CT0020893 · Elementary And Secondary Schools
- MIDDLETOWN POWER LLC c/o EASTERN GENERATION LLC CT0003883 · major · Electric Services
- Millstone Power Station CT0003263 · major · Electric Services
- Mira Dissolution Authority CT0003875 · major · Electric Services
- MONTVILLE POWER LLC c/o EASTERN GENERATION LLC CT0003115 · major · Electric Services
- Milford Power Company LLC CT0030309 · major
- Naval Submarine Base New London CT0003921 · major · National Security
- Northeast Fisheries Science CT0090182 · Commercial Physical Research
- Nucor Steel Connecticut, Inc. CT0026794 · Blast Furnaces And Steel Mills
- Oakridge Dairy, LLC CT0030801
- Pfizer Inc CT0000957 · Pharmaceutical Preparations
- Pharmacia & Upjohn Company, LLC CT0001341 · Nonclassifiable Establishments
- PL 612 Wheelers Farms Limited CT0024759 · Nonresidential Building Operators
- Pratt & Whitney Aircraft Co. CT0001406 · Aircraft Engines And Engine Parts
- Project Oceanology CT0030562
- Sea Research Foundation CT0020630 · Museums And Art Galleries
- Specialty Minerals, Inc. CT0003981 · Crushed And Broken Limestone
- Sumitomo Bakelite North America CT0003379 · Unsupported Plastics Film & Sheet
- Summit Corporation of America CT0001180 · major · Plating And Polishing
- Sterling Property, LLC CT0026972 · Electric And Other Services Combined
- TA Operating LLC CT0029530 · Courier Services, Except By Air
- Tilcon Connecticut Inc. CT0030155 · Crushed And Broken Stone
- Tilcon Connecticut, Inc. CT0000892 · Crushed And Broken Stone
- Tilcon Connecticut, Inc. CT0000906 · Crushed And Broken Stone
- Tilcon Connecticut, Inc. CT0030635
- The Thames Shipyard & Repair Company CT0030333 · Ship Building And Repairing
- Tilcon Connecticut, Inc. CT0030597
- United Aluminum CT0030201 · Aluminum Sheet, Plate, And Foil
- United Technologies Corporation, Pratt and Whitney Division CT0001376 · major · Aircraft Engines And Engine Parts
- University of Connecticut CT0028631 · Colleges And Universities
- University of Connecticut CT0101320 · major · Colleges And Universities
- Wieland Rolled Products North America, LLC CT0021873 · major · Copper Rolling And Drawing
- York Hill Trap Rock Quarry Company CT0030601 · Asphalt Paving Mixtures And Blocks
Source: EPA ECHO, Oct 22, 2026. As JSON: /api/v1/permits?state=CT · MCP: https://passage-data.com/mcp · All states