TRI Facilities
312
Very high
CT · EPA TRI · SDWIS · Superfund
Connecticut environmental disclosure record
According to EPA's 2023 Toxics Release Inventory, Safe Drinking Water Information System, and Superfund National Priorities List extracts, this is Connecticut's full public registry profile, toxic releases, drinking-water systems, and Superfund sites in one place.
- TRI facilities
- 312
- Reported releases
- 8.9M lbs
- #48 of 56
- Water systems
- 505
- Superfund NPL sites
- 17
Connecticut vs. every U.S. state
Cumulative TRI-reported release pounds, with this state marked in the national distribution
8.9M lbs 14th percentile higher than 14% of 56 states with TRI reporters
Each bar is a $1M-wide band; taller bars hold more states with TRI reporters. The dashed line and filled bar mark this facility. Hover, focus, or tap a bar for its full count, share, and position.
Source U.S. Environmental Protection Agency, Toxics Release Inventory · 2023 reporting year
CT regulatory profile by statute
Violation/site counts mapped to the EPA statutes this portal tracks
- CWA · NPDES
- RCRA · Subtitle C 17
What this shows Counts are mapped to statute as a structural proxy and reflect reported activity, not toxicity-weighted or population-adjusted risk. Clean Air Act (Title V) permit data is not currently ingested by this portal, so air-permit compliance is not shown here.
How Connecticut compares across two EPA disclosure measures
The highlighted point is Connecticut. The vertical axis is the share of tracked water systems with at least one health-based SDWIS record; the horizontal axis is TRI-reported pounds per facility on a logarithmic scale so the full state distribution stays readable. The crosshairs use the portal’s published national benchmark medians.
This matrix compares disclosure rates, not toxicity, exposure, current compliance, or drinking-water safety. A lower position on either axis is not a safety rating; use the underlying facility and water-system records for context.
According to EPA TRI, SDWIS, and Superfund NPL extracts, Connecticut (CT) lists 312 TRI-reporting facilities disclosing 8.9M lbs of toxic releases. The same extracts list 17 Superfund sites and 505 EPA-regulated water systems, of which 238 carry health-based SDWIS violation rows. PlainEnviro's composite environmental health score for Connecticut is 60/100 (grade D), benchmarked against all U.S. states on chemical release intensity, drinking-water health violations, Superfund site burden, and water violation rate. This is a percentile-derived composite from federal disclosure counts, not a clinical health-risk assessment.
D 60
Connecticut Environmental Health Score
A percentile-benchmarked 0–100 composite from 4 EPA federal datasets, with weight redistribution for any unavailable dimension
Chemical Release Intensity A 95
29K (lbs per facility) Drinking Water Health Violations F 41
47.1% (% of systems) Superfund Site Burden F 24
5.4 (sites per 100 facilities) Water Violation Rate C 74
1.6 (violations per system) Benchmarks derived from EPA TRI, SDWIS, and Superfund NPL extracts across all 56 U.S. states and territories
Water Systems
505
Moderate
Superfund Sites
17
Moderate
Total Releases
8.9M lbs
Low
Compliance Snapshot - CT
Sites with no recorded health violations 70.9%
Sites with at least one open violation 29.1%
Connecticut's profile joins three independently maintained EPA programs into one statewide record: the Toxics Release Inventory (TRI, EPCRA Section 313 industrial disclosures), the Safe Drinking Water Information System (SDWIS, Safe Drinking Water Act compliance), and the Superfund National Priorities List. Each program uses its own reporting cadence and facility-identification scheme; PlainEnviro joins them by matched facility and system location rather than a shared federal ID, so a site absent from one program is never assumed absent from another. The counts below reflect the portal's rebuild as of August 2026.
Activity clusters in counties such as Fairfield, Hartford, New Haven, which account for the highest combined facility, water-system, and Superfund presence. Monitoring and reporting violations are not included in the SDWIS counts shown here.
Every figure reflects the public regulatory record as filed with the U.S. Environmental Protection Agency and is not weighted for toxicity, geographic footprint, or population exposure. A state can rank high in any individual metric because of industrial history, naturally occurring contaminants in source water, or simply the number of reporting facilities, not because current residents face unsafe conditions. Drill into any county or water system below for the full disclosure record.
What does this state's environmental record show?
TRI Facilities
312
Water Systems
505
Superfund Sites
17
Health-Based Violation Records
801
Total Releases
8.9M lbs
cumulative, all reported years
Systems with Records
238
water systems
Release-over-release change
What changed for Connecticut: EPA TRI 2023 reporting year
Same facilities, both years
+1.9%
253 facilities that filed in 2022 and 2023
Whole inventory
-8.3%
1.6 million lb → 1.5 million lb, every facility that filed
These two measures point in opposite directions. Releases from the facilities present in both years rose, while the inventory-wide total fell. The difference is which facilities filed, not a different estimate of the same plants.
Between the two reporting years, 7 facilities filed for the first time and 11 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Connecticut's total reported releases rose from 1.5 million lb in 2022 to 1.5 million lb in 2023, based on EPA TRI filings.
- Connecticut's land releases fell from 1.7 thousand lb in 2022 to 183 lb in 2023, based on EPA TRI filings.
- Connecticut's water releases fell from 8.4 thousand lb in 2022 to 2.3 thousand lb in 2023, based on EPA TRI filings.
- Connecticut's off-site transfers rose from 857.4 thousand lb in 2022 to 948.5 thousand lb in 2023, based on EPA TRI filings.
Largest Polluters
View all →| # | Facility | Total Releases |
|---|---|---|
| 1 | Clean Harbors of Connecticut Inc | 1.5M lbs |
| 2 | Unimetal Surface Finishing LLC | 644.8K lbs |
| 3 | Allnex USA Inc. Wallingford Ct Site | 436.7K lbs |
| 4 | Pratt & Whitney | 306.2K lbs |
| 5 | American Greenfuels LLC | 280.7K lbs |
| 6 | Har-Conn Chrome Co | 272.6K lbs |
| 7 | Tradebe Treatment & Recycling of Bridgeport LLC | 223.2K lbs |
| 8 | Connecticut Galvanizing Corp | 209.1K lbs |
| 9 | Metal Finishing Technologies LLC | 207.1K lbs |
| 10 | Hutchinson Precision Sealing Systems Inc | 199.3K lbs |
| 11 | Ahlstrom Nonwovens LLC | 196.2K lbs |
| 12 | Cpv Towantic Energy Center | 193.2K lbs |
| 13 | Unimetal Surface Finishing LLC | 190.0K lbs |
| 14 | Element Materials Technology Hartford Inc. | 188.7K lbs |
| 15 | Electric Boat Corp | 166.3K lbs |
| 16 | Stanley Works Hand Tools Div. | 162.7K lbs |
| 17 | King Industries Inc | 150.6K lbs |
| 18 | Ametek Specialty Metal Products Div | 150.4K lbs |
| 19 | Prysmian Cable & Systems LLC | 143.6K lbs |
| 20 | Middletown Power LLC | 130.3K lbs |
Water Quality
Systems with Health Violations
| Water System | Population | Violations |
|---|---|---|
| MEADOWS AT CROSS RIVER | 630 | 104 |
| PINECREST CONDOMINIUMS | 110 | 19 |
| 31 GRIST MILL RD | 30 | 18 |
| NORWICH PUBLIC UTILITIES | 36,163 | 18 |
| JUNIPER CLUB INC. | 104 | 16 |
| ROCK TERRACE TRAILER PARK | 130 | 16 |
| HUBBARD HILL APARTMENTS | 36 | 14 |
| MARIANAPOLIS PREP SCHOOL - ST ALBERTS | 51 | 12 |
| FAWN RIDGE ASSOCIATION INC. | 36 | 11 |
| ORCHARD ACRES ASSOCIATION | 176 | 10 |
| TOLLAND WATER DEPT - TORRY ROAD | 204 | 10 |
| ABENAKI WATER/WHITE ROCK WATER | 238 | 10 |
| ELMWOOD COURT, LLC | 54 | 9 |
| CONRADS PARK | 60 | 9 |
| Mashantucket Pequot Water System | 22,171 | 8 |
| LAKE LILLINONAH SHORES CONDOS | 130 | 8 |
| TWIN HILLS WATER DISTRICT | 156 | 8 |
| KNOLLCREST TAX DISTRICT | 356 | 8 |
| WOODLAND SUMMIT COMMUNITY WATER ASSN | 216 | 8 |
| 39 HOP BROOK RD - APT COMPLEX | 36 | 7 |
Cities with Water Issues
Shelton
68 water systems
Clinton
63 water systems
Stamford
24 water systems
Gales Ferry
17 water systems
Danbury
12 water systems
Old Lyme
11 water systems
Tolland
11 water systems
East Hartford
10 water systems
Monroe
8 water systems
Enfield
7 water systems
Uncasville
7 water systems
East Hampton
7 water systems
Putnam
6 water systems
Durham
6 water systems
Brookfield
6 water systems
Norwich
5 water systems
New Milford
5 water systems
Storrs
5 water systems
Thompson
5 water systems
Westport
5 water systems
Superfund Sites (17)
| Site Name | Status | HRS Score |
|---|---|---|
| Barkhamsted-New Hartford Landfill | NPL Site | 38.05 |
| Beacon Heights Landfill | NPL Site | 46.77 |
| Cheshire Ground Water Contamination | Deleted NPL Site | 35.57 |
| Durham Meadows | NPL Site | 33.94 |
| Gallup's Quarry | NPL Site | 46.29 |
| Kellogg-Deering Well Field | NPL Site | 39.92 |
| Laurel Park, Inc. | NPL Site | 0.00 |
| Linemaster Switch Corp. | NPL Site | 33.71 |
| New London Submarine Base | NPL Site | 36.53 |
| Nutmeg Valley Road | Deleted NPL Site | 42.69 |
| Old Southington Landfill | Deleted NPL Site | 54.35 |
| Precision Plating Corp. | NPL Site | 49.10 |
| Raymark Industries, Inc. | NPL Site | 0.00 |
| Revere Textile Prints Corp. | Deleted NPL Site | 41.06 |
| Scovill Industrial Landfill | NPL Site | 50.00 |
| Solvents Recovery Service of New England | NPL Site | 44.93 |
| Yaworski Waste Lagoon | NPL Site | 36.72 |
Counties (8 total)
| County | Facilities |
|---|---|
| Fairfield | 47 |
| Hartford | 96 |
| New Haven | 92 |
| Middlesex | 16 |
| New London | 14 |
| Litchfield | 23 |
| Windham | 19 |
| Tolland | 5 |
Cities with Environmental Records
Waterbury
19 facilities · 2 water systems
New Haven
12 facilities · 1 water systems
Danbury
11 facilities · 12 water systems
Wallingford
11 facilities · 2 water systems
Manchester
8 facilities · 2 water systems
New Britain
8 facilities · 1 water systems
Newington
8 facilities · 1 water systems
North Haven
8 facilities · 1 water systems
Bristol
7 facilities · 2 water systems
Bridgeport
7 facilities · 1 water systems
Southington
7 facilities · 1 water systems
Stratford
7 facilities · 0 water systems
Watertown
6 facilities · 3 water systems
Meriden
6 facilities · 1 water systems
Shelton
5 facilities · 68 water systems
East Hartford
5 facilities · 10 water systems
Bethel
5 facilities · 4 water systems
Torrington
5 facilities · 3 water systems
Groton
5 facilities · 2 water systems
Middletown
5 facilities · 2 water systems
Frequently Asked Questions
How many TRI facilities are in Connecticut? ▼
Connecticut has 312 facilities that report to the EPA Toxic Release Inventory (TRI). These facilities have collectively reported 8.9M lbs in total toxic chemical releases. TRI data is self-reported annually by facilities that manufacture, process, or use listed toxic chemicals above threshold amounts.
Does Connecticut have Superfund sites? ▼
Yes, Connecticut has 17 sites on the EPA Superfund National Priorities List (NPL). Superfund sites are contaminated locations identified for long-term cleanup under the EPA Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
What does EPA SDWIS list for drinking water in Connecticut? ▼
Connecticut has 505 EPA-regulated water systems in the Safe Drinking Water Information System (SDWIS) extract used here. 238 water systems have a health-based violation row (MCL exceedance) in this historical extract. A past registry row is not a current drinkability verdict. For current utility conditions, contact the local water utility or the Connecticut drinking water program. Source: EPA SDWIS.
What environmental data is available for Connecticut? ▼
PlainEnviro provides three categories of EPA environmental data for Connecticut: Toxic Release Inventory (TRI) data covering 312 industrial facilities, Safe Drinking Water Information System (SDWIS) data for 505 water systems, and Superfund National Priorities List (NPL) data for 17 contaminated sites.
How does Connecticut compare to other states on EPA disclosure counts? ▼
Connecticut has 312 TRI facilities with 8.9M lbs in total releases, 17 Superfund sites, and 801 water system violations on record. These are federal disclosure counts; they are not toxicity-weighted or population-adjusted risk scores. Source: EPA TRI, SDWIS, and Superfund NPL databases.
What is Connecticut's environmental health score? ▼
PlainEnviro's composite environmental health score for Connecticut is 60/100 (grade D). This score combines four percentile-benchmarked dimensions from EPA federal extracts: chemical release intensity per TRI facility, drinking-water health violation rate from SDWIS, Superfund site burden relative to industrial activity, and overall water violation rate. Scores are benchmarked against all 56 U.S. states and territories. When a dimension lacks data, its weight redistributes to the remaining dimensions so the score never deflates from missing inputs. This is a registry-count composite, not a clinical exposure or health-outcome assessment.
Explore More Data for Connecticut
TRI Facilities in Connecticut →
Every toxic-release facility reporting in the state, ranked by volume
Drinking Water Systems in Connecticut →
Community water systems and their violation records
Air Quality in Connecticut →
County-level AQI from EPA monitoring stations
Compare states by burden →
EJ screening scores for every U.S. county
State environmental rankings →
How states compare on releases, water and Superfund
Browse all states →
Environmental profiles for every U.S. state
About This Data
This page aggregates environmental data from three EPA programs for Connecticut: the Toxic Release Inventory (TRI) for industrial chemical releases, the Safe Drinking Water Information System (SDWIS) for water quality, and the Superfund National Priorities List (NPL) for hazardous waste cleanup sites.
PlainEnviro presents this data without advocacy framing. Numbers reflect reported data and may not capture all environmental activity. For specific health or environmental concerns, contact your state environmental agency.
What to do with Connecticut's data
Use this state profile as a starting point, then drill into the specific dataset that matters to you.
- Check the 312 TRI facilities reporting in Connecticut for the largest reported releases near a specific county. View facilities
- 238 water systems in the state have a recorded health-based violation, check if yours is one of them. Check water systems
- See how Connecticut compares to other states on releases, water violations, and Superfund sites. State rankings
Reported data reflects what facilities and agencies disclose to the EPA; it is not a complete measure of environmental risk or a substitute for local guidance.
Use and verify this record
Connecticut's profile brings together EPA release, drinking-water, and Superfund records. It reports the underlying programs without making a health or environmental-risk determination.
State environmental figures are computed directly from EPA data. The methodology records the joins, definitions, and refresh cadence for each program.
PlainEnviro renders public EPA records directly from its data pipeline; no figure on this page is typed in by an editor. See the editorial standards and corrections policy for how source changes and reported errors are handled.