Middlesex County, CT
The federal environmental record for Middlesex County: what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
1
Superfund NPL sites
10
federal cleanup sites
2
PFAS-detecting water systems
14
TRI facilities
42
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Durham Meadows | Durham | on the NPL | 10/04/1989 |
Drinking water: PFAS testing
Public water systems serving Middlesex 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 |
|---|---|---|
| CROMWELL FIRE DISTRICT WATER DEPARTMENT CT0330011 | PFHxS: 8.7 ng/L PFOS: 4.6 ng/L | above final limit |
| PORTLAND WATER DEPARTMENT CT1130011 | PFPeA: 3.6 ng/L PFHxA: 3.3 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
14 facilities in Middlesex filed TRI reports for 2024, totalling 39k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| KLEEN ENERGY SYSTEMS LLC | MIDDLETOWN | Ammonia | 13k lb |
| HABASIT AMERICA INC. | MIDDLETOWN | Toluene | 9k lb |
| MIDDLETOWN POWER LLC | MIDDLETOWN | Ammonia, Polycyclic aromatic compounds | 8k lb |
| VWR CHEMICALS LLC | CHESTER | Acetonitrile | 4k lb |
| PRATT & WHITNEY | MIDDLETOWN | Nickel, Chromium | 3k lb |
| HOBSON & MOTZER, INC. | DURHAM | Ethylene glycol | 1k lb |
| PERMA TREAT CORP | DURHAM | Creosote, Polycyclic aromatic compounds | 509 lb |
| BOURDON FORGE CO INC | MIDDLETOWN | Nickel, Copper | 32 lb |
| SMITH & WESSON PRECISION COMPONENTS PLASTICS LLC | DEEP RIVER | Tetrabromobisphenol A | 11 lb |
| WHELEN ENGINEERING CO | CHESTER | Lead | 3 lb |
| TILCON CONNECTICUT INC | OLD SAYBROOK | - | 0 lb |
| TILCON CONNECTICUT INC. | WALLINGFORD | Polycyclic aromatic compounds | 0 lb |
| HUBBELL POWER SYSTEMS INC. - RIPLEY TOOLS | CROMWELL | - | 0 lb |
| AEROCISION LLC | CHESTER | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 474 tank facilities in Middlesex: 277 tanks in service and 1,573 closed. 117 fuel releases are on record, of which 42 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Middlesex 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 Middlesex, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- A. N. PIERSON, INC.CROMWELL
- CHESTEL, INC. (CONTEL IPC)CHESTER
- EAST HADDAM MUNICIPAL LANDFILLEAST HADDAM
- HADDAM MUNICIPAL LANDFILLHADDAM
- HIGHLINE PRODUCTS CORPOLD SAYBROOK
- L C DOANE COMPANYESSEX
- OMO MANUFACTURING SITEMIDDLETOWN
- US ARMY RESERVE CENTERMIDDLETOWN
- VERPLEX COMPANYESSEX
- WASLEY LIGHTING/AMF/FOUNDERS GROUPESSEX