Home hazard report for 06856 — Norwalk, CT
ZIP 06856 is served by South Norwalk Electric & Water (as listed by the state): 3 violations since 2016, latest lead result 0 ppb, PFAS not detected. Western Connecticut is in EPA radon no zone.
Health-based violations since 2016: Carbon, Total. 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.
None of the tested PFAS were found above EPA’s reporting limits in 2023–2025.
EPA has not assigned this area a radon zone. Testing is the only way to know.
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code.
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Where ZIP 06856 is
blue: utility service area · scroll or pinch to zoomDrinking water: South Norwalk Electric & Water
Health-based violations
| Contaminant or rule | Health-based violations since 2016 |
|---|---|
| Carbon, Total | 3 |
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 Jan 2019.
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 |
|---|---|---|---|
| PFPeA | not detected | 0 of 4 | — |
| PFBA | not detected | 0 of 4 | — |
| HFPO-DA (GenX) | not detected | 0 of 4 | — |
| PFBS | not detected | 0 of 4 | — |
| PFHxA | not detected | 0 of 4 | — |
| PFDA | not detected | 0 of 4 | — |
| PFOA | not detected | 0 of 4 | 4 ppt MCL |
| PFOS | not detected | 0 of 4 | 4 ppt MCL |
| PFNA | not detected | 0 of 4 | — |
| PFHxS | not detected | 0 of 4 | — |
| PFHpA | not detected | 0 of 4 | — |
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 Western Connecticut
EPA radon no zone — not mapped. EPA has not assigned this area a radon zone. Testing is the only way to know.
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 |
|---|---|---|
| Kellogg-Deering Well Field Norwalk, Connecticut · EPA ID CTD980670814 | Active (final NPL) | 1.5 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 06856
Who supplies drinking water to ZIP 06856?
South Norwalk Electric & Water (EPA ID CT1030021), a surface water (rivers, lakes) system serving about 42,000 people, listed by the state as serving this ZIP code.
Is there lead in Norwalk, 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 Norwalk, CT water have PFAS?
None of the tested PFAS were found above EPA’s reporting limits in 2023–2025.
Has the water system in 06856 had violations?
Health-based violations since 2016: Carbon, Total. All are listed as resolved.
Are there Superfund sites near 06856?
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code. Sites within 10 miles: Kellogg-Deering Well Field (1.5 mi, Active (final NPL)).
Is radon a problem in Western Connecticut?
Western Connecticut is in EPA radon no zone (not mapped). EPA has not assigned this area a radon zone. Testing is the only way to know.