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Review government records associated with Groton, Connecticut.
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Preparing Groton environmental records...
Check your water bill for your utility name and confirm the reporting year. See EPA’s guide to finding your annual water quality report.
Public water-system records for Groton, CT from EPA SDWIS.
Groton Utilities
Active monitoring or reporting issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City listed in EPA records · Serves 30,200 people
Data from EPA SDWIS
Reviewed: source records as of Q1 2026
EPA UCMR5 — No PFAS detection records shown for these water systems
Open data source: EPA UCMR5DoD PFAS — No investigation records shown for this report
Open data source: DoD PFASEPA ATTAINS records identify assessed water bodies that do not meet water-quality standards for designated uses.
Stony Brook-Frontal Fishers Island Sound
Reported: Nov 2026
Health-relevant causes: Pathogens
Affected uses: Ecological, Fishconsumption, Recreation
Data from EPA ATTAINS
NPDES permits regulate pollutant discharges into U.S. waterways. Facilities must report compliance quarterly.
Violation records
Last inspected: Dec 2025
Last inspected: Dec 2025
Data from EPA ECHO
To investigate water contamination, check the sampling locations, dates and results below. For tap water records, see Drinking water quality above.
Reviewed: source records as of 2026
Review historical EPA air pollution records, including monitoring and facility emissions where available. For current conditions, check local air quality on AirNow.
New London County
Assessment year: 2020
According to EPA, a cancer risk of 20-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 20 may develop cancer from that exposure. This is in addition to cancer risk from all other causes.
Top modeled source groups
Data from EPA AirToxScreen
EPA designations apply to a specific pollutant and federal air quality standard (NAAQS). EPA can issue a clean-data determination while a formal designation remains in effect.
Greater Connecticut: Ozone
NonattainmentSerious8-Hour Ozone (2015 Standard)
Original designation: Aug 2018
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
Historical designations under the revoked 1997 ozone standard
These records describe historical designations. EPA revoked the 1997 ozone standard on April 6, 2015.
Greater Connecticut Area
Historical standard: 0.08 ppm (8-hour)
Historical designation: Nonattainment · Subpart 2/Moderate
Original designation: Jun 2004
Open data source: EPA final revocation ruleContinuing requirements have not been verified for this area.
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Fort Griswold Park — Groton, Connecticut
Annual mean: 0.045 Parts per million
EPA primary exceedance count: 8 (Ozone 8-hour 2015)
Observation year: 2025
Annual mean: 5.7 Micrograms/cubic meter (LC)
Observation year: 2025
Data from EPA AQS
Facilities regulated under the Clean Air Act. CAA HPV flags indicate serious noncompliance such as exceeding emission limits.
Air Violations
Last inspected: Dec 2025
Last inspected: Dec 2025
Data from EPA ECHO
TRI releases are self-reported annual totals (calendar year 2024). Hover fugitive or stack for definitions.
Doncasters Inc Precision Castings New England
Reported: 2024
Electric Boat Corp
Reported: 2024
Pcc Structurals
Reported: 2024
Reviewed: source query run Nov 2026
Reviewed: source query run Nov 2026
Facilities with hazardous-waste handler records under RCRA in the reviewed 5-mile city-center search area. Active handler status is separate from air, water, or other ECHO compliance violations, which are shown in their own sections.
Active RCRA handler records in the reviewed city search area
No release reports shown in this group.
Reviewed: active/open records as of 2018
Data from EPA UST Finder
Reviewed: reporting year 2024
Formerly Used Defense Sites are properties previously owned by, leased to, or otherwise possessed by the United States and under the jurisdiction of the Secretary of Defense. The FUDS program addresses environmental restoration at these properties.
Open data source: USACE FUDSNo MSHA mine or extraction site records shown for this report.
New London County, CT
EPA Radon Zone Map (June 2024 release)
New London County is EPA Radon Zone 1 (highest potential). EPA defines Zone 1 counties as having predicted average indoor screening levels above 4 pCi/L.
Radon levels can vary from home to home, so EPA recommends testing the property to know its indoor level.
FEMA flood zones describe mapped flood hazards. Look up a specific address with FEMA.
Minimal flood hazard — outside the 1% and 0.2% annual chance floodplains.
Results use an earlier stored RMP inventory. Current EPA ECHO location coverage is unverified.
EPA ECHO lists facilities linked to the Risk Management Program. Results include facilities with locations that can be matched. Records may be historical. Current operations, chemical inventories, and recent accident history are unverified.
Nuclear Regulatory Commission licensed facilities. The Emergency Planning Zone extends 10 miles for plume exposure and 50 miles for the ingestion pathway.
Reported: Mar 2026
This city report includes a facility within the 10-mile plume exposure Emergency Planning Zone.
1 reactor · Operated by Dominion Energy Nuclear Connecticut, Inc.
Reported: Mar 2026
This city report includes a facility within the 10-mile plume exposure Emergency Planning Zone.
1 reactor · Operated by Dominion Energy Nuclear Connecticut, Inc.
Reviewed: 2000-present
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
New London County, ConnecticutPop. 268,805
County Health Rankings edition: 2024
Premature Death
Poor or Fair Health
Poor Physical Health Days
Poor Mental Health Days
Adult Smoking
Adult Obesity
Air Pollution - Particulate Matter
Drinking water violation indicator
Diabetes Prevalence
Life Expectancy
| Indicator | County | State | National |
|---|---|---|---|
| Premature Death | 7,306 | 6,480 | 7,972 |
| Poor or Fair Health | 11.8% | 11.8% | 14.2% |
| Poor Physical Health Days | 3.2 | 2.9 | 3.3 |
| Poor Mental Health Days | 5.0 | 4.4 | 4.8 |
| Adult Smoking | 14.7% | 11.5% | 15.0% |
| Adult Obesity | 31.0% | 30.6% | 34.0% |
| Air Pollution - Particulate Matter | 6.5 | 7.4 | 7.3 |
| Drinking water violation indicator | Yes | N/A | N/A |
| Diabetes Prevalence | 8.7% | 9.3% | 9.6% |
| Life Expectancy | 78.6 | 79.6 | 77.6 |
This report does not have PFAS sample results for the candidate water systems in Groton.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 4 violations for Groton Utilities.
Check your water bill to identify the utility serving your address. Ask that utility about current drinking water advisories.
Nearby EPA monitoring stations provide annual air quality measurements for Groton.
The monitoring station at Fort Griswold Park, Groton, Connecticut recorded an annual average of 0.045 Parts per million for ozone in 2025.
The monitoring station at Fort Griswold Park, Groton, Connecticut recorded an annual average of 5.7 Micrograms/cubic meter (LC) for fine particles (PM2.5) in 2025.
The radon data for Groton covers New London County. EPA places this area in Zone 1, with a predicted average indoor radon screening level above 4 picocuries per liter.
No Superfund or brownfield sites were returned for this city report.
The county data for Groton reports a life expectancy of 78.6 years in New London County, Connecticut.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for Groton reports 7,306 years of life lost to deaths before age 75 per 100,000 residents in New London County, Connecticut. This measure adds up the years lost to early deaths and adjusts for differences in population age.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for Groton lists fine-particle pollution (PM2.5) at 6.5 micrograms per cubic meter in New London County, Connecticut.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.