Home hazard report for 11555 — Uniondale, NY
ZIP 11555 is served by Town of Hempstead Water Department: no health-based violations since 2016, latest lead result 1 ppb, PFAS 1 detected. Nassau is in EPA radon zone 3.
No health-based violations reported since 2016.
90th-percentile lead in the latest round (Jan 2021). Lead comes mostly from household plumbing and service lines, so individual homes can be higher.
PFAS were detected, with PFOA and PFOS below 4.0 ppt (highest not detected).
Predicted average under 2 pCi/L — but any home can have high radon, so EPA still recommends a test.
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code.
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Where ZIP 11555 is
blue: utility service area · scroll or pinch to zoomDrinking water: Town of Hempstead Water Department
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 |
|---|---|---|---|
| PFPeA | 4.2 ppt | 2 of 26 | — |
| PFHpA | not detected | 0 of 26 | — |
| PFBS | not detected | 0 of 26 | — |
| PFHxS | not detected | 0 of 26 | — |
| PFNA | not detected | 0 of 26 | — |
| PFOS | not detected | 0 of 26 | 4 ppt MCL |
| PFOA | not detected | 0 of 26 | 4 ppt MCL |
| PFDA | not detected | 0 of 26 | — |
| HFPO-DA (GenX) | not detected | 0 of 26 | — |
| PFHxA | not detected | 0 of 26 | — |
| PFBA | not detected | 0 of 26 | — |
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 Nassau
EPA radon zone 3 — low potential. Predicted average under 2 pCi/L — but any home can have high radon, so EPA still recommends a test.
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 |
|---|---|---|
| Pasley Solvents & Chemicals, Inc. Hempstead, New York · EPA ID NYD991292004 | Cleaned up & deleted | 2.2 mi |
| Old Roosevelt Field Contaminated Ground Water Area Garden City, New York · EPA ID NYSFN0204234 | Active (final NPL) | 2.7 mi |
| New Cassel/Hicksville Ground Water Contamination New Cassel/Hicksville, New York · EPA ID NY0001095363 | Active (final NPL) | 4.0 mi |
| Jackson Steel Mineola, North Hempstead, New York · EPA ID NYD001344456 | Cleaned up & deleted | 4.1 mi |
| Fulton Avenue North Hempstead, New York · EPA ID NY0000110247 | Active (final NPL) | 4.2 mi |
| Genzale Plating Co. Franklin Square, New York · EPA ID NYD002050110 | Active (final NPL) | 4.6 mi |
| Anchor Chemicals Hicksville, New York · EPA ID NYD001485226 | Cleaned up & deleted | 5.2 mi |
| Hooker Chemical & Plastics Corp./Ruco Polymer Corp. Hicksville, New York · EPA ID NYD002920312 | Active (final NPL) | 6.1 mi |
| Peninsula Boulevard Ground Water Plume Hewlett, New York · EPA ID NYN000204407 | Active (final NPL) | 7.2 mi |
| Liberty Industrial Finishing Farmingdale, New York · EPA ID NYD000337295 | Active (final NPL) | 7.8 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 11555
Who supplies drinking water to ZIP 11555?
Town of Hempstead Water Department (EPA ID NY2900000), a groundwater (wells) system serving about 110,000 people.
Is there lead in Uniondale, NY tap water?
The utility’s latest 90th-percentile lead result (Jan 2021) was 1 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 Uniondale, NY water have PFAS?
PFAS were detected, with PFOA and PFOS below 4.0 ppt (highest not detected).
Has the water system in 11555 had violations?
No health-based violations reported since 2016.
Are there Superfund sites near 11555?
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code. Sites within 10 miles: Pasley Solvents & Chemicals, Inc. (2.2 mi, Cleaned up & deleted); Old Roosevelt Field Contaminated Ground Water Area (2.7 mi, Active (final NPL)); New Cassel/Hicksville Ground Water Contamination (4.0 mi, Active (final NPL)).
Is radon a problem in Nassau?
Nassau is in EPA radon zone 3 (low potential). Predicted average under 2 pCi/L — but any home can have high radon, so EPA still recommends a test.