New London, CT
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 New London in Connecticut
TRI sites such as Electric Boat Corp; Freeport-McMoran Copper Products Norwich Rod Plant; Americas Styrenics Allyns Point Plant; SDWIS systems such as NORWICH PUBLIC UTILITIES; Mohegan Tribal Utility Authority; GROTON UTILITIES; NPL sites such as New London Submarine Base anchor New London, CT's EPA extract. Derived burden score 46/100 (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 New London include NORWICH PUBLIC UTILITIES; Mohegan Tribal Utility Authority; Mashantucket Pequot Water System, while Electric Boat Corp leads reported TRI pounds among local Form R filers. AQS median AQI 37 / peak 126 in 2024.
Burden score 46/100 (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 New London -- 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 New London, CT: EPA TRI 2023 reporting year
Same facilities, both years
-26.4%
10 facilities that filed in 2022 and 2023
Whole inventory
-25.1%
35.6 thousand lb → 26.7 thousand lb, every facility that filed
Between the two reporting years, 1 facility filed for the first time and 0 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- New London, CT's total reported releases fell from 35.6 thousand lb in 2022 to 26.2 thousand lb in 2023, based on EPA TRI filings.
- New London, CT's water releases fell from 100 lb in 2022 to 56 lb in 2023, based on EPA TRI filings.
- New London, CT's off-site transfers fell from 23.8 thousand lb in 2022 to 15.9 thousand lb in 2023, based on EPA TRI filings.
- New London, CT's air releases fell from 11.7 thousand lb in 2022 to 10.2 thousand lb in 2023, based on EPA TRI filings.
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 | 309 (85%) | 51 | 5 | 126 |
| 2023 | 258 (71%) | 95 | 7 | 166 |
| 2022 | 290 (79%) | 71 | 4 | 108 |
| 2021 | 277 (76%) | 79 | 7 | 129 |
| 2020 | 274 (75%) | 87 | 3 | 172 |
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 (69)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| NORWICH PUBLIC UTILITIES | 36,163 | 18 |
| Mohegan Tribal Utility Authority | 31,961 | 3 |
| GROTON UTILITIES | 30,200 | 0 |
| Mashantucket Pequot Water System | 22,171 | 8 |
| WATERFORD WPCA | 16,578 | 0 |
| EAST LYME WATER & SEWER COMMISSION | 15,245 | 0 |
| COLCHESTER SEWER & WATER COMMISSION | 4,020 | 0 |
| LEDYARD WPCA - LEDYARD CENTER | 3,294 | 6 |
| SCWA, MONTVILLE DIVISION (MTV) | 2,570 | 0 |
| SCWA, TOWER-FERRY VIEW DIVISION | 2,567 | 2 |
| GROTON LONG POINT ASSOCIATION | 2,400 | 0 |
| LEDYARD WPCA, GALES FERRY SYSTEM | 2,369 | 0 |
| NOANK FIRE DISTRICT | 1,947 | 0 |
| SCWA, NORTH STONINGTON DIVISION (NST) | 1,860 | 1 |
| SCWA, MOHEGAN DIVISION | 1,428 | 0 |
| MONTVILLE WATER SUPPLY | 1,300 | 1 |
| SPRAGUE WATER & SEWER AUTHORITY | 1,058 | 0 |
| SCWA, OAKDALE HEIGHTS DIVISION | 876 | 3 |
| SCWA, LEDYARD CENTER DIVISION | 652 | 0 |
| PRESTON PLAINS WATER COMPANY | 550 | 1 |
| SCWA, CHESTERFIELD DIVISION | 524 | 0 |
| KITEMAUG ORCHARD ASSOCIATION, INC. | 490 | 2 |
| SCWA, HILLCREST DIVISION (HLC) | 450 | 0 |
| SCWA, ROBIN HILL DIVISION (RBN) | 388 | 0 |
| SCWA, CEDAR RIDGE DIVISION | 370 | 2 |
| SUNNY WATERS MOBILE HOME PARK | 303 | 0 |
| SCWA, BARRETT DIVISION (BAR) | 300 | 0 |
| CHADWICK HOMEOWNERS ASSN., INC. | 292 | 1 |
| ST. THOMAS MORE SCHOOL-MAIN SYSTEM | 270 | 2 |
| WESTCHESTER HILLS CONDOMINIUM ASSN. | 225 | 1 |
| COLCHESTER COMMONS | 224 | 3 |
| CRYSTAL LAKE CONDOMINIUMS | 184 | 1 |
| WATERFORD COUNTRY SCHOOL, INC. | 180 | 2 |
| CAREFREE HOMEOWNERS ASSOCIATION | 172 | 1 |
| SCWA, CHRISWOOD DIVISION (CWD) | 164 | 0 |
| CAMPBELL HEIGHTS APARTMENTS | 152 | 6 |
| ALCOVY MOBILE HOME PARK | 120 | 0 |
| RIVER'S REACH | 115 | 0 |
| ASH WATER COMPANY, LLC | 108 | 2 |
| SCWA, BIRCHWOOD DIVISION (BWD) | 108 | 0 |
| GREEN VILLAGE II | 96 | 0 |
| WHISPERING PINES MHP | 94 | 0 |
| DEERWOOD MANOR DRINKING WATER SYSTEM | 84 | 0 |
| LINCOLN PARK ELDERLY HOUSING | 80 | 1 |
| BROOKSIDE VILLAGE | 80 | 0 |
| RYE FIELD MANOR ELDERLY HOUSING | 78 | 0 |
| ASHLAND POND MOBILE HOME PARK | 74 | 2 |
| ROUND HILL LLC - WELL# 1&2 | 72 | 1 |
| MARINA COVE | 70 | 3 |
| MYSTIC VILLAGE APARTMENTS | 66 | 0 |
| MILE CREEK APARTMENTS | 60 | 2 |
| NEIGHBORS OF ROGERS, LLC | 57 | 1 |
| INDEPENDENCE VILLAGE ELDERLY HOUSING | 55 | 1 |
| LYMEWOOD ELDERLY HOUSING | 50 | 1 |
| COUNTRY ACRES PARK | 48 | 1 |
| LAUREL HEIGHTS ASSOCIATION, INC. | 45 | 1 |
| FREEDOM VILLAGE ELDERLY HOUSING | 43 | 4 |
| VOLUNTOWN HOUSING AUTHORITY | 42 | 5 |
| GARFIELD DRIVE MOBILE HOME PARK | 42 | 0 |
| FOX LAUREL MOBILE HOME PARK, LLC | 40 | 4 |
| LYME REGIS, INC. | 32 | 1 |
| SALEM MANOR CONDOMINIUMS, SYSTEM #1 | 32 | 3 |
| 31 GRIST MILL RD | 30 | 18 |
| BOXWOOD CONDOMINIUM ASSOCIATION | 28 | 5 |
| SCWA, SEVEN OAKS (OAK) | 26 | 0 |
| ST. THOMAS MORE SCHOOL-THE COVE | 25 | 0 |
| SALEM MANOR CONDOMINIUMS, SYSTEM #2 | 25 | 1 |
| PINE MEADOWS SUBDIVISION | 25 | 0 |
| PLEASANT OAKS SUBDIVISION | 25 | 0 |
TRI Facilities (14)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Electric Boat Corp | 166.3K lbs |
| 2 | Freeport-McMoran Copper Products Norwich Rod Plant | 54.9K lbs |
| 3 | Americas Styrenics Allyns Point Plant | 53.2K lbs |
| 4 | Sheffield Pharmaceuticals LLC | 20.7K lbs |
| 5 | Pcc Structurals | 5.8K lbs |
| 6 | Doncasters Inc Precision Castings New England | 2.8K lbs |
| 7 | Davis-Standard LLC | 1.6K lbs |
| 8 | US Dod-Naval Submarine Base New London | 758 lbs |
| 9 | Nalas Engineering Services Inc | 475 lbs |
| 10 | Montville Power LLC | 55 lbs |
| 11 | US Coast Guard Academy | 32 lbs |
| 12 | The Embalmers' Supply Co | 0 lbs |
| 13 | Tilcon Connecticut Inc. | 0 lbs |
| 14 | Tilcon Connecticut Inc | 0 lbs |
Superfund Sites (1)
| Site Name | Status | HRS Score |
|---|---|---|
| New London Submarine Base | NPL Site | 36.53 |
Cities in New London (22)
Frequently Asked Questions
What is the environmental risk level in New London, Connecticut? ▼
Are there Superfund sites in New London? ▼
How many toxic release facilities are in New London? ▼
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What environmental agencies cover New London? ▼
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.
Read our methodology - how this data is sourced, computed, and verified.