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Water Quality in Ansonia, CT 06401

Water testing in Ansonia (06401) has identified 93 contaminants — nearly 4x the state average. This is among the highest detection counts in Connecticut, which means residents here face a wider range of potential exposures than most of the state. For households with infants, elderly members, or pets, the risks may be compounded because many of these contaminants have stricter health guidelines for vulnerable populations.

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Key Facts About Ansonia Water

Contaminants Detected

93

substances found in local water testing

Personalized For

11

household member types including pets

What Ansonia Residents Should Know

Ansonia's water supply has one of the highest contaminant detection counts in Connecticut. Health guidelines from the EWG and California OEHHA are often stricter than federal legal limits — a contaminant can be "legal" but still exceed recommended health levels. This is especially important for babies under one year, whose developing organs are more susceptible to even low-level chemical exposure.

Contaminants Detected in Ansonia, CT 06401 Water

Detected in public water testing for ZIP 06401, ranked by how often samples were above the EPA limit. Enforceable health limits are shown in red; secondary (aesthetic) standards like manganese are advisory, not legal limits.

ManganeseOTHER
Detected in 100% of samples · above the EPA secondary (aesthetic) standard in 17.5% · secondary standard 50 ppb
PFOANO_SAFE_LEVEL
Detected in 21.6% of samples · exceeded the EPA limit in 15.7% · EPA limit 4 ppt
PFOSNO_SAFE_LEVEL
Detected in 30.4% of samples · exceeded the EPA limit in 14.3% · EPA limit 4 ppt
LeadNO_SAFE_LEVEL
Detected in 89.5% of samples · exceeded the EPA limit in 8.8% · EPA limit 0.015 mg/L
Nitrate-NitriteHAS_SAFE_LEVEL
Detected in 100% of samples · exceeded the EPA limit in 0.5% · EPA limit 10 mg/L as N
CopperHAS_SAFE_LEVEL
Detected in 100% of samples · exceeded the EPA limit in 0.1% · EPA limit 1.3 mg/L
chromium-6ZERO_TOLERANCE
Detected in 100% of samples
Combined Radium 226/228OTHER
Detected in 100% of samples · EPA limit 5 pCi/L

Source: EPA SDWIS / UCMR public water testing. Detection and exceedance rates reflect samples in this area; enter your ZIP above for a report personalized to your household.

Environmental Sites Near Ansonia, CT 06401

Documented sites in or near this ZIP from EPA and CT DEEP records. These are most relevant for private-well owners as potential groundwater concerns — public water is treated and tested separately. Their presence near a ZIP does not by itself mean your drinking water is affected, but it’s a reason for well owners to test.

2
PFAS sources
2
Dry-cleaner / solvent (PCE/TCE) sites
11
Open CT DEEP cleanup/remediation cases
19
Leaking underground storage tanks
13
Spills that reached water
4
Toxic-release (TRI) facilities
6
Permitted (NPDES) dischargers

Compiled from EPA (SEMS/TRI/ECHO) and CT DEEP records; many are undated historical site inventories. Most recent dated event in this area: 2024-11-14.

Frequently Asked Questions

Is the tap water safe to drink in Ansonia, CT?▾
Whether Ansonia tap water is safe depends on your household. While it may meet federal legal limits, many contaminants are present at levels above stricter health guidelines — especially for vulnerable groups like infants, pregnant women, and elderly residents. Enter your ZIP code 06401 above to see your personalized risk assessment.
What contaminants are in 06401 water?▾
93 contaminants have been detected in the water serving ZIP code 06401. The ones most often above EPA limits or standards are Manganese, PFOA, PFOS, Lead and Nitrate-Nitrite. Get your full report to see which ones affect your household.
Is CheckYourTap free?▾
Yes, CheckYourTap is completely free. Enter your ZIP code and tell us who lives in your home to get a personalized water quality report with health risk assessments for 120+ contaminants.
Does Ansonia have well water data?▾
Yes, CheckYourTap covers both city water (public water systems) and private well water in Ansonia and throughout Connecticut. Well water reports use USGS groundwater data and include geology-based risk factors for arsenic, uranium, and radon.

Nearby Areas

Beacon Falls 06403Branford 06405Cheshire 06410Chester 06412Groton 06390Clinton 06413
View all Connecticut water quality reports

About This Report

Water quality data for Ansonia, CT 06401 is compiled from public records filed with the U.S. Environmental Protection Agency (EPA SDWIS), the U.S. Geological Survey (USGS NWIS), and the Connecticut Department of Public Health. Health guidelines reference the strictest available standards from the EWG, California OEHHA, and WHO. Risk assessments are personalized for 11 household member types. CheckYourTap is a service of Valiant Energy Solutions, a Connecticut company established in 1930.

Last updated March 2026