Home hazard report for 00501 — Holtsville, NY
ZIP 00501 is served by Suffolk County Water Authority: 1 violation since 2016, latest lead result 1.3 ppb, PFAS 17.4 ppt. Suffolk is in EPA radon zone 3.
Health-based violations since 2016: Asbestos. All are listed as resolved.
90th-percentile lead in the latest round (Jan 2025). 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. 9 PFAS compounds detected.
Predicted average under 2 pCi/L — but any home can have high radon, so EPA still recommends a test.
The nearest active Superfund site is 3.0 miles away.
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Where ZIP 00501 is
blue: utility service area · scroll or pinch to zoomDrinking water: Suffolk County Water Authority
Health-based violations
| Contaminant or rule | Health-based violations since 2016 |
|---|---|
| Asbestos | 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 2020.
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 |
|---|---|---|---|
| PFHxA | 43.5 ppt | 45 of 480 | — |
| PFPeA | 39.4 ppt | 53 of 480 | — |
| PFOS | 17.4 ppt | 13 of 480 | 4 ppt MCL |
| PFBA | 12.6 ppt | 9 of 480 | — |
| PFHxS | 10.8 ppt | 19 of 480 | — |
| PFHpA | 9.6 ppt | 4 of 480 | — |
| PFOA | 6.5 ppt | 19 of 480 | 4 ppt MCL |
| PFNA | 5.7 ppt | 2 of 480 | — |
| PFBS | 5.2 ppt | 5 of 480 | — |
| HFPO-DA (GenX) | not detected | 0 of 480 | — |
| PFDA | not detected | 0 of 480 | — |
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 Suffolk
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 |
|---|---|---|
| Goldisc Recordings, Inc. Holbrook, New York · EPA ID NYD980768717 | Active (final NPL) | 3.0 mi |
| BioClinical Laboratories, Inc. Bohemia, New York · EPA ID NYD980768683 | Cleaned up & deleted | 4.1 mi |
| Islip Municipal Sanitary Landfill Islip, New York · EPA ID NYD980506901 | Active (final NPL) | 7.2 mi |
| Lawrence Aviation Industries, Inc. Port Jefferson Station, New York · EPA ID NYD002041531 | Active (final NPL) | 7.9 mi |
| Smithtown Ground Water Contamination Smithtown, New York · EPA ID NY0002318889 | Cleaned up & deleted | 8.4 mi |
| MacKenzie Chemical Works, Inc. Central Islip, New York · EPA ID NYD980753420 | Active (final NPL) | 8.6 mi |
| Brookhaven National Laboratory (USDOE) Upton, New York · EPA ID NY7890008975 | Active (final NPL) | 9.7 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 00501
Who supplies drinking water to ZIP 00501?
Suffolk County Water Authority (EPA ID NY5110526), a groundwater (wells) system serving about 1,100,000 people.
Is there lead in Holtsville, NY tap water?
The utility’s latest 90th-percentile lead result (Jan 2025) was 1.3 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 Holtsville, NY 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. 9 PFAS compounds detected.
Has the water system in 00501 had violations?
Health-based violations since 2016: Asbestos. All are listed as resolved.
Are there Superfund sites near 00501?
The nearest active Superfund site is 3.0 miles away. Sites within 10 miles: Goldisc Recordings, Inc. (3.0 mi, Active (final NPL)); BioClinical Laboratories, Inc. (4.1 mi, Cleaned up & deleted); Islip Municipal Sanitary Landfill (7.2 mi, Active (final NPL)).
Is radon a problem in Suffolk?
Suffolk 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.