Home hazard report for 06503 — New Haven, CT
ZIP 06503 is served by Regional Water Authority (as listed by the state): no health-based violations since 2016, latest lead result 0 ppb, PFAS 10.7 ppt. South Central Regional is in EPA radon no zone.
No health-based violations reported since 2016.
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.
EPA has not assigned this area a radon zone. Testing is the only way to know.
No active Superfund site within 10 miles of the ZIP center.
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Where ZIP 06503 is
blue: utility service area · scroll or pinch to zoomDrinking water: Regional Water Authority
Health-based violations
No health-based violations reported since 2016.
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 |
|---|---|---|---|
| PFOS | 10.7 ppt | 7 of 30 | 4 ppt MCL |
| PFOA | 7.1 ppt | 4 of 30 | 4 ppt MCL |
| PFBS | 3.5 ppt | 3 of 30 | — |
| PFPeA | 3.1 ppt | 1 of 30 | — |
| HFPO-DA (GenX) | not detected | 0 of 30 | — |
| PFBA | not detected | 0 of 30 | — |
| PFDA | not detected | 0 of 30 | — |
| PFHxA | not detected | 0 of 30 | — |
| PFNA | not detected | 0 of 30 | — |
| PFHxS | not detected | 0 of 30 | — |
| PFHpA | not detected | 0 of 30 | — |
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 South Central Regional
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
No site on EPA’s Superfund National Priorities List lies within 10 miles of the center of this ZIP code.
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 06503
Who supplies drinking water to ZIP 06503?
Regional Water Authority (EPA ID CT0930011), a surface water (rivers, lakes) system serving about 418,900 people, listed by the state as serving this ZIP code.
Is there lead in New Haven, 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 New Haven, 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 06503 had violations?
No health-based violations reported since 2016.
Are there Superfund sites near 06503?
No active Superfund site within 10 miles of the ZIP center.
Is radon a problem in South Central Regional?
South Central Regional is in EPA radon no zone (not mapped). EPA has not assigned this area a radon zone. Testing is the only way to know.