Home hazard report for 06811 — Danbury, CT
ZIP 06811 is served by Danbury Water Department: 1 violation since 2016, latest lead result 0 ppb, PFAS 5.4 ppt. Fairfield County is in EPA radon zone 1.
Health-based violations since 2016: Interim Enhanced Surface Water Treatment Rule. All are listed as resolved.
90th-percentile lead in the latest round (Jan 2026). Lead comes mostly from household plumbing and service lines, so individual homes can be higher.
Highest PFOA or PFOS result in EPA’s 2023–2025 testing was at or above 4.0 ppt, EPA’s 2024 maximum contaminant level for each. 4 PFAS compounds detected.
Predicted average indoor radon above 4 pCi/L — EPA’s action level. Test your home.
The nearest active Superfund site is 6.5 miles away.
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Where ZIP 06811 is
Dashed: ZIP area · blue: utility service area · scroll or pinch to zoomDrinking water: Danbury Water Department
Health-based violations
| Contaminant or rule | Health-based violations since 2016 |
|---|---|
| Interim Enhanced Surface Water Treatment Rule | 1 |
A health-based violation means a contaminant exceeded its legal limit (MCL) or a required treatment technique was not met, as reported by the state to EPA’s SDWIS. All are listed as resolved or archived; the latest began Jul 2021.
Full record for Danbury Water Department →
Other systems overlapping this ZIP: Aquarion-Pearce Manor, Cornell Hills Assoc, INC.
Lead
90th-percentile lead per sampling round (90% of the homes sampled were at or below this level). Black line: EPA’s 15 ppb action level; under the Lead and Copper Rule Improvements the action level becomes 10 ppb from 2027.
PFAS (“forever chemicals”)
| Compound | Highest result | Samples with detection | EPA limit |
|---|---|---|---|
| PFOA | 5.4 ppt | 7 of 8 | 4 ppt MCL |
| PFBS | 4.3 ppt | 4 of 8 | — |
| PFHxA | 3.6 ppt | 2 of 8 | — |
| PFPeA | 3.4 ppt | 3 of 8 | — |
| PFHpA | not detected | 0 of 8 | — |
| PFOS | not detected | 0 of 8 | 4 ppt MCL |
| PFNA | not detected | 0 of 8 | — |
| PFDA | not detected | 0 of 8 | — |
| HFPO-DA (GenX) | not detected | 0 of 8 | — |
| PFHxS | not detected | 0 of 8 | — |
| PFBA | not detected | 0 of 8 | — |
EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR 5), samples 2023–2025; ppt = parts per trillion (ng/L). The 4.0 ppt maximum contaminant levels for PFOA and PFOS were set by EPA in 2024; water systems have until the end of the decade to comply.
Radon in Fairfield County
EPA radon zone 1 — highest potential. Predicted average indoor radon above 4 pCi/L — EPA’s action level. Test your home.
Radon is a colorless, odorless radioactive gas from soil and rock, and the leading cause of lung cancer among non-smokers. EPA recommends fixing a home at 4 pCi/L or above and considering it from 2 pCi/L. A short-term test kit costs about $15–30. How radon zones work →
Superfund sites nearby
| Site | Status | Distance |
|---|---|---|
| Brewster Well Field Brewster, New York · EPA ID NYD980652275 | Active (final NPL) | 6.5 mi |
EPA Superfund National Priorities List (NPL): the country’s most serious known hazardous-waste sites, each with an EPA cleanup record (linked). Distance is measured from the ZIP center to the site’s reference point; being near a site does not by itself mean exposure — EPA site pages describe what was found and how it is being cleaned up.
What this is — and isn’t. These are records your water utility and state reported to the EPA, and the EPA’s radon map for your county. They describe the system and the area, not the water from your own tap or the air in your home. For that, read your utility’s annual Consumer Confidence Report and test: lead and radon tests are inexpensive.
Questions about 06811
Who supplies drinking water to ZIP 06811?
Danbury Water Department (EPA ID CT0340011), a surface water (rivers, lakes) system serving about 62,055 people.
Is there lead in Danbury, CT tap water?
The utility’s latest 90th-percentile lead result (Jan 2026) was 0 ppb; EPA’s action level is 15 ppb, falling to 10 ppb from 2027. Lead mostly comes from service lines and home plumbing, so the only way to know your tap is to test it.
Does Danbury, CT water have PFAS?
Highest PFOA or PFOS result in EPA’s 2023–2025 testing was at or above 4.0 ppt, EPA’s 2024 maximum contaminant level for each. 4 PFAS compounds detected.
Has the water system in 06811 had violations?
Health-based violations since 2016: Interim Enhanced Surface Water Treatment Rule. All are listed as resolved.
Are there Superfund sites near 06811?
The nearest active Superfund site is 6.5 miles away. Sites within 10 miles: Brewster Well Field (6.5 mi, Active (final NPL)).
Is radon a problem in Fairfield County?
Fairfield County is in EPA radon zone 1 (highest potential). Predicted average indoor radon above 4 pCi/L — EPA’s action level. Test your home.