New Haven County, CT
The federal environmental record for New Haven County: what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
5
Superfund NPL sites
41
federal cleanup sites
7
PFAS-detecting water systems
77
TRI facilities
169
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Beacon Heights Landfill | Beacon Falls | on the NPL | 09/08/1983 |
| Cheshire Ground Water Contamination | Cheshire | deleted | 08/30/1990 |
| Laurel Park, Inc. | Naugatuck Borough | on the NPL | 09/08/1983 |
| Nutmeg Valley Road | Wolcott | deleted | 03/31/1989 |
| Scovill Industrial Landfill | Waterbury | on the NPL | 07/27/2000 |
Drinking water: PFAS testing
Public water systems serving New Haven with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| CTWC - SHORELINE REGION-GUILFORD SYSTEM CT0608011 | PFOS: 12 ng/L PFBA: 12 ng/L PFOA: 6 ng/L | above final limit |
| MERIDEN WATER DIVISION CT0800011 | PFOS: 9.5 ng/L PFOA: 6.1 ng/L PFHxA: 5.8 ng/L | above final limit |
| REGIONAL WATER AUTHORITY CT0930011 | PFOS: 10.7 ng/L PFOA: 7.1 ng/L PFBS: 3.5 ng/L | above final limit |
| AQUARION WATER CO OF CT-VALLEY SYSTEM CT1240011 | PFOA: 8.1 ng/L PFOS: 6.9 ng/L PFPeA: 6.8 ng/L | above final limit |
| HERITAGE WATER COMPANY CT1300021 | PFOA: 4.1 ng/L PFBS: 3.2 ng/L | above final limit |
| WALLINGFORD WATER DEPARTMENT CT1480011 | PFOS: 13.9 ng/L PFHxS: 10.7 ng/L PFBS: 4 ng/L | above final limit |
| AQUARION WATER CO OF CT-TLWC WOODRICH CT1666011 | PFOA: 6.3 ng/L PFOS: 6.2 ng/L PFBS: 4.5 ng/L | above final limit |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
77 facilities in New Haven filed TRI reports for 2024, totalling 882k lb released. The 25 largest by volume:
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| WATERBURY SCREW MACHINE PRODUCTS CO INC | WATERBURY | Copper compounds, Lead compounds | 413k lb |
| ALLNEX USA INC. WALLINGFORD CT SITE | WALLINGFORD | n-Butyl alcohol, Methanol | 89k lb |
| AMERICAN GREENFUELS LLC | NEW HAVEN | Methanol | 74k lb |
| AMETEK SPECIALTY METAL PRODUCTS DIV | WALLINGFORD | Trichloroethylene | 46k lb |
| CPV TOWANTIC ENERGY CENTER | OXFORD | Ammonia | 38k lb |
| ELECTRIC CABLE COMPOUNDS INC | NAUGATUCK | Zinc compounds, Antimony compounds | 36k lb |
| SAFETY-KLEEN SYSTEMS INC | NEW HAVEN | Ethylene glycol, Zinc compounds | 34k lb |
| WIELAND ROLLED PRODUCTS N.A. - WATERBURY FACILITY | WATERBURY | Dichloromethane, Copper | 25k lb |
| UNIMETAL SURFACE FINISHING LLC | NAUGATUCK | Zinc compounds | 19k lb |
| WATERBURY PLATING LLC. | WATERBURY | Nickel And Nickel Compounds, Cyanide compounds | 17k lb |
| E & J PARTS CLEANING INC | WATERBURY | Trichloroethylene | 14k lb |
| ROEHM AMERICA LLC | WALLINGFORD | Toluene, Methyl methacrylate | 14k lb |
| HUBBARD-HALL INC | WATERBURY | Nitric acid, Trichloroethylene | 13k lb |
| SHELL NEW HAVEN TERMINAL | NEW HAVEN | Xylene (mixed isomers), n-Hexane | 10k lb |
| MACDERMID ENTHONE INC | WEST HAVEN | Copper compounds, Lead And Lead Compounds | 10k lb |
| SILGAN DISPENSING SYSTEMS COVIT AMERICA | WATERBURY | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 8k lb |
| SOLVENTUM PURIFICATION INC. MERIDEN FACILITY | MERIDEN | Methanol, tert-Butyl alcohol | 4k lb |
| BYK USA INC | WALLINGFORD | Xylene (mixed isomers), Ethylbenzene | 3k lb |
| GLOBAL NEW HAVEN TERMINAL | NEW HAVEN | Toluene, Xylene (mixed isomers) | 3k lb |
| LUVATA WATERBURY INC | WATERBURY | Copper And Copper Compounds, Phenol | 2k lb |
| TRADEBE TREATMENT & RECYCLING NORTHEAST LLC | MERIDEN | Ethylene glycol, Methanol | 2k lb |
| CAAP CO INC | MILFORD | Xylene (mixed isomers), Methyl isobutyl ketone | 2k lb |
| WATERBURY PEAKING ELEC GENERATING PLANT | WATERBURY | Ammonia | 2k lb |
| SARGENT MANUFACTURING CO | NEW HAVEN | Nickel, Copper | 1k lb |
| SCHICK MANUFACTURING INC | MILFORD | Chromium, Nickel | 858 lb |
Underground fuel tanks
EPA's UST Finder records 2,192 tank facilities in New Haven: 1,234 tanks in service and 7,192 closed. 459 fuel releases are on record, of which 169 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps New Haven as Zone 1, the highest predicted indoor radon levels (over 4 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for New Haven, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- 3M PURIFICATION INCMERIDEN
- ANAMETWATERBURY
- ANSONIA COPPER & BRASS SITEWATERBURY
- BRISTOL BABCOCK INCWATERBURY
- CHESHIRE GROUND WATER CONTAMINATIONCHESHIRE
- CHESHIRE LANDFILL CLEANUP SITECHESHIRE
- CRC CHROMEMERIDEN
- EAST MAIN STREET DISPOSAL AREABRANFORD
- ECHLIN MANUFACTURING COMPANYBRANFORD
- EDWARD E RUSSELL COMPANYWALLINGFORD
- ELECTRO POWER, INC.WOLCOTT
- HARTT PROPERTYNORTH BRANFORD
- HUBBARD HALL INCWATERBURY
- KRAS TOOL & MACHINE COMPANYWOLCOTT
- LAUREL PARK LANDFILLNAUGATUCK
- LEED-HIMMEL INDUSTRIESHAMDEN
- LEWIS CORPORATIONOXFORD
- LOGAN STEELMERIDEN
- MAILLY MANUFACTURING COMPANYWOLCOTT
- MIKON PRODUCTS, INC.OXFORD
- MILFORD ARMY RESERVE CENTERMILFORD
- MILFORD RIVET & MACHINEMILFORD
- MILLER JOHNSON (FORMER)MERIDEN
- MOSS AMERICAN, INC. (SCHIAVONNE PROPERTY)NORTH HAVEN
- MOSS AMERICAN, INC. (SCHIAVONNE PROPERTY)NORTH HAVEN
- NORTHEAST UTILITIESWATERBURY
- NUTMEG VALLEY ROADWOLCOTT
- O'SULLIVAN'S ISLANDDERBY
- ORANGE AIR NATIONAL GUARD STATIONORANGE
- PANDEL PROPERTIES LLCANSONIA
- PAR FINISHINGWOLCOTT
- PF INDUSTRIESWOLCOTT
- SCOVILL INDUSTRIAL LANDFILLWATERBURY
- SHERWOOD MEDICAL COMPANYWATERBURY
- SUPERIOR STEEL PRODUCTS CORPORATIONCHESHIRE
- U.S. COAST GUARD STATION, NEW HAVENEAST HAVEN
- VDO CONTROL SYSTEMS, INC.CHESHIRE
- WAMPUS MILFORD ASSOCIATES SITEMILFORD
- WATERBURY /DPW (MUN INCIN)WATERBURY
- WIN MANUFACTURING COMPANY, INC.EAST HAVEN
- ZOLLO DRUM COMPANYBEACON FALLS