New London, CT
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology.
Environmental data for New London in Connecticut
New London, CT is tracked across three EPA datasets covering 14 Toxics Release Inventory (TRI) facilities, 67 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 41/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 306.5K lbs of reported toxic releases under EPCRA Section 313, while 37 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 37 and a peak AQI of 126 in 2024, with 85% of observed days rated "Good" (0–50).
All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.
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 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 (67)
| System | Population | Violations |
|---|---|---|
| NORWICH PUBLIC UTILITIES | 36,163 | 18 |
| Mohegan Tribal Utility Authority | 31,961 | 3 |
| GROTON UTILITIES | 30,200 | 0 |
| Mashantucket Pequot Water System | 26,445 | 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 | 5 |
| 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 |
| OAKDALE HEIGHTS ASSOCIATION, INC | 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 | 1 |
| 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 |
| 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 |
| 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 |
Cities in New London (7)
Frequently Asked Questions
What is the environmental risk level in New London, Connecticut? ▼
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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.