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Review government records associated with Derby, Connecticut.
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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 Derby, CT from EPA SDWIS.
Torrington Water Company
Active health-based drinking-water issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City-area ZIP code · Serves 37,915 people
Regional Water Authority
Active monitoring or reporting issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City-area ZIP code · Serves 418,900 people
Aquarion-East Derby
No active drinking-water issues detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
Purchased or imported water record · Serves 1,101 people
Data from EPA SDWIS
PFAS screening separates EPA UCMR5 drinking-water monitoring from nearby DoD PFAS investigation-site records; EPA samples shown are from Sep 2023 to Jun 2024.
Drinking Water PFAS Monitoring
EPA UCMR5 samples public water systems. These results are separate from nearby PFAS cleanup or investigation-site records.
8 PFAS sample results above EPA limits
Sample period: Sep 2023 to Jun 2024
UCMR5 results are sampled by public water system, not every household. Confirm your water provider before treating these as tap-water results for a specific address.
| Chemical | Concentration (µg/L) | EPA Limit (µg/L) | Sample date | Over Limit |
|---|---|---|---|---|
| PFOS | 0.0107 | 0.0040 | 2024-03-18 | Yes |
| PFOS | 0.0081 | 0.0040 | 2023-09-20 | Yes |
| PFOA | 0.0071 | 0.0040 | 2024-03-18 | Yes |
| PFOA | 0.0063 | 0.0040 | 2023-09-20 | Yes |
| PFOA | 0.0052 | 0.0040 | 2023-09-18 | Yes |
| PFOS | 0.0046 | 0.0040 | 2024-03-18 | Yes |
| PFOS | 0.0043 | 0.0040 | 2024-03-19 | Yes |
| PFOA | 0.0043 | 0.0040 | 2024-06-11 | Yes |
PFAS detections below EPA limits.
Nearby PFAS Investigation Sites
DoD records are nearby site investigations, not Derby drinking-water detections. Record names come from the source database and can be broad.
No DoD PFAS investigation records shown for this report.
EPA ATTAINS records identify assessed water bodies that do not meet water-quality standards for designated uses.
Bladens River-Naugatuck River
Reported: Nov 2026
Health-relevant causes: Pathogens
Affected uses: Ecological, 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
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 Haven County
Assessment year: 2020
According to EPA, a cancer risk of 30-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 30 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 designates an area as nonattainment when air quality does not meet federal health-based standards (NAAQS) for a specific pollutant.
New York-Northern New Jersey-Long Island: Ozone
NonattainmentSerious8-Hour Ozone (2015 Standard)
Original designation: Aug 2018
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
New York-N. New Jersey-Long Island: Ozone
NonattainmentSevere 158-Hour Ozone (2008 Standard)
Original designation: Jul 2012
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
Maintenance areas
Previously nonattainment; currently meeting the standard and monitored under an EPA maintenance plan.
New Haven-Meriden-Waterbury Area
CO · Carbon Monoxide (1971 Standard)
Classification: Not Classified
Original designation: Nov 1990
Current design value: 1.7 ppm (2023-2025)
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Criscuolo Park-New Haven
Annual mean: 0.2 Parts per million
Observation year: 2025
Annual mean: 0.5 Parts per billion
Observation year: 2025
Annual mean: 24.8 Parts per billion
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
Reviewed: source query run Nov 2026
Brownfield sites are properties where redevelopment is complicated by the presence of hazardous substances.
Open data source: Search EPA ECHO3 sites with active cleanup or investigation status
150 Roosevelt Dr, Derby
Reported: Feb 2026
46 Commerce St, Derby
Reported: Feb 2026
67 71 Minerva St, Derby
Reported: Feb 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
Sites regulated by the Mine Safety and Health Administration, including mines, sand and gravel operations, and portable crushers. Status and type are from the MSHA Mine Data Retrieval System. Records with active/intermittent status dates older than 5 years are shown as older records rather than current active sites.
More MSHA records matched the search than this preview shows.
Recently updated active/intermittent sites (3)
Data from MSHA
New Haven County, CT
EPA Radon Zone Map (June 2024 release)
New Haven 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.
Reviewed: 2000-present
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
New Haven County, ConnecticutPop. 863,700
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 | 7,362 | 6,480 | 7,972 |
| Poor or Fair Health | 13.0% | 11.8% | 14.2% |
| Poor Physical Health Days | 3.2 | 2.9 | 3.3 |
| Poor Mental Health Days | 4.7 | 4.4 | 4.8 |
| Adult Smoking | 14.8% | 11.5% | 15.0% |
| Adult Obesity | 31.4% | 30.6% | 34.0% |
| Air Pollution - Particulate Matter | 7.9 | 7.4 | 7.3 |
| Drinking water violation indicator | Yes | N/A | N/A |
| Diabetes Prevalence | 9.2% | 9.3% | 9.6% |
| Life Expectancy | 78.5 | 79.6 | 77.6 |
EPA testing found PFAS in water samples from Regional Water Authority. Results dated Sep 18, 2023 to Jun 11, 2024 include PFOS at 0.004 to 0.0107 micrograms per liter and PFOA at 0.0043 to 0.0071 micrograms per liter.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 5 violations for Torrington Water Company.
EPA drinking water records on this page list 58 violations for Regional Water Authority.
The EPA drinking water records available here list no violations for Aquarion-East Derby.
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 Derby.
The monitoring station at Criscuolo Park-New Haven recorded an annual average of 0.2 Parts per million for carbon monoxide in 2025.
The monitoring station at Criscuolo Park-New Haven recorded an annual average of 0.5 Parts per billion for sulfur dioxide in 2025.
The monitoring station at Criscuolo Park-New Haven recorded an annual average of 24.8 Parts per billion for nitrogen dioxide in 2025.
Download 2025 EPA annual monitor dataCurrent air quality on AirNow
The radon data for Derby covers New Haven County. EPA places this area in Zone 1, with a predicted average indoor radon screening level above 4 picocuries per liter.
No Superfund sites were returned for this city report.
This city report shows 3 brownfield sites: 150 Roosevelt Dr; 46 Commerce St; 67 71 Minerva St.
EPA Superfund recordsView on EPA ECHOView on EPA ECHOView on EPA ECHO
The county data for Derby reports a life expectancy of 78.5 years in New Haven 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 Derby reports 7,362 years of life lost to deaths before age 75 per 100,000 residents in New Haven 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 Derby lists fine-particle pollution (PM2.5) at 7.9 micrograms per cubic meter in New Haven County, Connecticut.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.