PlainEnviro

Middlesex, CT

Moderate Risk (45/100)

Transparent derived index from EPA TRI / SDWIS / Superfund extracts: not an official EPA rating. Fixed caps: facilities ≤25 pts (50+ = max), log10 releases ≤25 pts, Superfund ≤25 pts (5/site), health-violation systems ≤15 pts (3/system), high-chemical facilities ≤10 pts. Bands: High ≥60, Moderate ≥30. See methodology.

Environmental data for Middlesex in Connecticut

TRI sites such as Middletown Power LLC; Perma Treat Corp; Kleen Energy Systems LLC; SDWIS systems such as CTWC - NORTHERN REG-WESTERN SYSTEM; MIDDLETOWN WATER DEPARTMENT; CTWC - SHORELINE REGION-GUILFORD SYSTEM; NPL sites such as Durham Meadows anchor Middlesex, CT's EPA extract. Derived burden score 45/100 (Moderate Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.

Health-flagged SDWIS rows in Middlesex include CTWC - UNIONVILLE SYSTEM; PORTLAND WATER DEPARTMENT; DURHAM CENTER DIVISION, while Middletown Power LLC leads reported TRI pounds among local Form R filers. AQS median AQI 40 / peak 177 in 2024.

Burden score 45/100 (Moderate Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for Middlesex -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.

Release-over-release change

What changed for Middlesex, CT: EPA TRI 2023 reporting year

2022 → 2023

Same facilities, both years

+13.5%

13 facilities that filed in 2022 and 2023

Whole inventory

+14.1%

49.5 thousand lb → 56.5 thousand lb, every facility that filed

Between the two reporting years, 2 facilities filed for the first time and 0 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.

  • Middlesex, CT's total reported releases rose from 49.5 thousand lb in 2022 to 56.2 thousand lb in 2023, based on EPA TRI filings.
  • Middlesex, CT's water releases fell from 340 lb in 2022 to 155 lb in 2023, based on EPA TRI filings.
  • Middlesex, CT's off-site transfers fell from 2.4 thousand lb in 2022 to 1.6 thousand lb in 2023, based on EPA TRI filings.
  • Middlesex, CT's air releases rose from 46.8 thousand lb in 2022 to 54.5 thousand lb in 2023, based on EPA TRI filings.
TRI Facilities
16
Water Systems
94
Superfund Sites
1
Total Releases
328.3K lbs

Air Quality History (2020–2024)

EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.

Year Good Moderate Unhealthy (SG) Max AQI
2024 178 (85%) 25 5 177
2023 170 (81%) 35 4 140
2022 173 (82%) 33 6 147
2021 171 (83%) 25 10 151
2020 182 (88%) 24 2 129
2024 Good Air Quality: 85% of days
Unhealthy days: 6
Median AQI: 40

Source: EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)

For real-time air quality readings and pollutant breakdowns in Connecticut, see the EPA's AirNow.gov.

Water Systems (94)

System System pop (SDWIS) Violations
CTWC - NORTHERN REG-WESTERN SYSTEM 101,313 0
MIDDLETOWN WATER DEPARTMENT 41,019 0
CTWC - SHORELINE REGION-GUILFORD SYSTEM 33,975 0
CTWC - NAUGATUCK REGION-CENTRAL SYSTEM 22,735 0
CTWC - UNIONVILLE SYSTEM 14,693 1
CROMWELL FIRE DISTRICT WATER DEPARTMENT 14,316 0
AVON WATER CO 11,590 0
HERITAGE WATER COMPANY 7,300 0
CTWC - CRYSTAL SYSTEM 6,378 0
CTWC - NAUGATUCK REG-COLLINSVILLE SYS 6,324 0
CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM 5,607 0
CTWC - SHORELINE REGION-CHESTER SYSTEM 5,030 0
PORTLAND WATER DEPARTMENT 5,010 1
CTWC - NAUGATUCK REG-THOMASTON SYSTEM 3,789 0
CTWC - SHORELINE REGION-SOUND VIEW 3,397 0
CONNECTICUT VALLEY HOSPITAL 2,928 0
CTWC - GALLUP SYSTEM 2,538 0
CTWC - HEBRON CENTER DIVISION 1,927 0
CTWC - PLAINFIELD SYSTEM 1,713 0
DURHAM CENTER DIVISION 1,601 1
CTWC - LEGEND HILL SYSTEM 1,368 0
CTWC - THOMPSON SYSTEM 1,070 0
CTWC - SHORELINE REGION-POINT O WOODS 1,068 0
CTWC - AMSTON LAKE DIVISION 910 0
CTWC - JENSENS BEECHWOOD SYSTEM 750 2
CTWC - UCONN SOUTH EAGLEVILLE DIV. 750 0
CTWC - SPICE HILL DIVISION 712 2
CTWC - COVENTRY HILLS DIV 700 0
EDGEMERE CONDOMINIUM ASSN., INC. 540 0
CTWC - SOUTH COVENTRY SYSTEM 501 1
CTWC - NORTHERN REGION-LAKEVIEW TERRACE 472 0
CTWC - SHORELINE REGION-MASONS ISLAND 445 0
CTWC - BAY MOUNTAIN 440 0
CTWC - REDWOOD FARMS DIVISION 424 3
EAST HAMPTON WPCA - VILLAGE CENTER 366 0
CTWC - ASHFORD PARK DIVISION 334 0
EAST HAMPTON WPCA - ROYAL OAKS SYSTEM 328 1
CTWC - GENERAL WATER DIVISION 306 0
CTWC - NORTHERN REGION-LAKEWOOD 276 0
CTWC - BANNER VILLAGE 265 0
CTWC - WESTCHESTER VILLAGE 252 1
CTWC - UCONN HUNTING LODGE DIV. 234 0
CTWC - PILGRIM HILLS DIVISION 229 3
CTWC - CHIMNEY HILL 227 0
BLUE TRAILS WATER ASSOCIATION 224 4
CTWC - LONDON PARK DIVISION 221 0
CTWC - SHORELINE REG-CHESTER VLLG WEST 216 2
CTWC - SDC WATER 216 0
HERITAGE COVE CONDOMINIUMS 208 0
CTWC - BAKER HILL DIVISION 203 0
CTWC - NORTHERN REG-LLYNWOOD SYSTEM 192 0
CTWC - COUNTRY MOBILE DIV. 186 0
CTWC - RIVERSEDGE DIVISION 179 0
MALLARD COVE CONDOMINIUM ASSN. 177 2
CTWC - CRYSTAL SPRINGS DIV. 169 1
CTWC - SACHEM VILLAGE CONDO 166 0
CTWC - NORTHERN REG-NATHAN HALE SYSTEM 160 0
CTWC - WESTCHESTER EAST 153 5
CTWC - UCONN DEPOT DIV. 153 0
CTWC - UCONN WILLOWBROOK DIV. 134 0
COBALT LODGE HEALTHCARE & REHAB CENTER 130 1
CHESTELM HEALTH & REHABILITATION CENTER 120 4
CTWC - MARLBOROUGH GARDENS 110 0
CTWC - GREEN SPRINGS SYSTEM 104 1
TWIN MAPLES NURSING HOME 100 1
CTWC - FOREST HOMES DIVISION 100 3
SOLANO INN LLC 96 1
CTWC - RIVERCREST DIVISION 88 1
M&M REALTY HOLDINGS LLC 87 0
LAKEVIEW ESTATES - MIDDLEFIELD 85 0
SYLVAN RIDGE CONDOMINIUMS 84 0
AARON MANOR NURSING & REHAB CENTER 81 2
FRANKLIN ACADEMY 81 0
CTWC - BIRCHWOOD HEIGHTS 76 0
SOUTH FACE VILLAGE AT OKEMO 70 0
CTWC - PINEWOODS LANE DIV 68 0
CTWC - LEBANON ELDERLY DIV. 67 1
MIDDLEFIELD HOUSING AUTHORITY 62 1
CTWC - NORTHERN REG-RESERVOIR HEIGHTS 62 0
CTWC - PONEMAH VILLAGE 60 0
CTWC - WELLSWOOD VILLAGE DIV 60 0
CTWC - CORNFIELD POINT DIV. 57 0
DURHAM ELDERLY HOUSING DIVISION 50 2
CHATHAM ACRES ELDERLY HOUSING 50 1
DURHAM LEXINGTON PLACE DIVISION 45 0
GOODSPEED ACTOR HOUSING - THE VILLAGE 40 2
BITTERSWEET RIDGE WATER ASSOCIATION 40 1
RIDGEWOOD HILLS ASSOCIATION SYSTEM 1 36 3
CTWC - POMPEY HOLLOW DIVISION 32 0
CTWC - COLUMBIA HEIGHTS DIV. 32 0
OLD INDIAN TRAIL 32 1
BELLWOOD COURT 31 1
WESTSIDE MANOR 30 0
CTWC - FLORENCE LORD (MASH) 30 0

TRI Facilities (16)

# Facility Total Releases
1 Middletown Power LLC 130.3K lbs
2 Perma Treat Corp 77.7K lbs
3 Kleen Energy Systems LLC 50.8K lbs
4 Habasit America Inc. 40.7K lbs
5 Pratt & Whitney 18.5K lbs
6 Vwr Chemicals LLC 9.6K lbs
7 Hobson & Motzer, Inc. 275 lbs
8 Bourdon Forge Co Inc 163 lbs
9 Smith & Wesson Precision Components Plastics LLC 162 lbs
10 Tilcon Connecticut Inc. 0 lbs
11 Aerocision LLC 0 lbs
12 Whelen Engineering Co 0 lbs
13 Tilcon Connecticut Inc 0 lbs
14 Tilcon Connecticut Inc 0 lbs
15 Bell Power Systems 0 lbs
16 Hubbell Power Systems Inc. - Ripley Tools 0 lbs

Superfund Sites (1)

Site Name Status HRS Score
Durham Meadows NPL Site 33.94

Cities in Middlesex (16)

Middletown
5 facilities · 2 water
Chester
3 facilities · 1 water
Durham
2 facilities · 6 water
Cromwell
1 facilities · 2 water
Portland
1 facilities · 2 water
Essex
1 facilities · 1 water
Deep River
1 facilities · 0 water
Old Saybrook
1 facilities · 0 water
Clinton
0 facilities · 63 water
East Hampton
0 facilities · 7 water
Middlefield
0 facilities · 4 water
East Haddam
0 facilities · 2 water
Cobalt
0 facilities · 1 water
Killingworth
0 facilities · 1 water
Moodus
0 facilities · 1 water
Rockfall
0 facilities · 1 water

Frequently Asked Questions

What is the environmental risk level in Middlesex, Connecticut? ▼
Middlesex, CT has an environmental risk score of 45/100 (Moderate Risk), based on 16 TRI facilities, 1 Superfund sites, and 94 water systems on record. 32 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in Middlesex? ▼
Yes, Middlesex, CT has 1 Superfund site on the EPA National Priorities List (NPL). Superfund sites are contaminated locations that require long-term cleanup under the EPA Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
How many toxic release facilities are in Middlesex? ▼
Middlesex, CT has 16 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 328.3K lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in Middlesex? ▼
In 2024, Middlesex, CT recorded a median AQI of 40 and a peak AQI of 177. 85% of monitored days had "Good" air quality (AQI 0–50). Source: EPA Air Quality System (AQS) Annual AQI by County.
Is the drinking water safe in Middlesex? ▼
Middlesex, CT has 94 EPA-regulated water systems. 32 systems have reported health-based violations (MCL exceedances). A past violation does not necessarily mean water is currently unsafe. For current water quality, contact your local water utility. Source: EPA SDWIS.
What environmental agencies cover Middlesex? ▼
Environmental compliance in Middlesex, Connecticut is overseen by the U.S. Environmental Protection Agency (EPA) at the federal level and the Connecticut state environmental agency. Facilities report to the EPA Toxic Release Inventory, water systems are regulated under the Safe Drinking Water Act, and contaminated sites are managed under the Superfund program. Contact your state environmental agency for local concerns.

What does this county environmental profile show?

This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.

Related Guides

Understanding EPA Data
How EPA collects and publishes environmental data
Environmental Justice
Who lives near polluters and environmental hazards
How to Check Environmental Quality
Step-by-step guide to checking your local environment

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from U.S. EPA environmental datasets. See our methodology for details. Retrieved and formatted by PlainEnviro