Home hazard report for 17703 — Williamsport, PA
ZIP 17703 is served by Williamsport Mun Water Auth: no health-based violations since 2016, latest lead result 2 ppb, PFAS 5.1 ppt. Lycoming is in EPA radon zone 1.
No health-based violations reported since 2016.
90th-percentile lead in the latest round (Jun 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. 5 PFAS compounds detected.
Predicted average indoor radon above 4 pCi/L — EPA’s action level. Test your home.
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code.
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Where ZIP 17703 is
blue: utility service area · scroll or pinch to zoomDrinking water: Williamsport Mun Water Auth
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 |
|---|---|---|---|
| PFNA | 9.7 ppt | 3 of 4 | — |
| PFOS | 5.1 ppt | 1 of 4 | 4 ppt MCL |
| PFPeA | 4.1 ppt | 1 of 4 | — |
| PFHxS | 3.6 ppt | 2 of 4 | — |
| PFHxA | 3.5 ppt | 1 of 4 | — |
| PFOA | not detected | 0 of 4 | 4 ppt MCL |
| PFDA | not detected | 0 of 4 | — |
| HFPO-DA (GenX) | not detected | 0 of 4 | — |
| PFHpA | not detected | 0 of 4 | — |
| PFBS | not detected | 0 of 4 | — |
| PFBA | 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 Lycoming
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 |
|---|---|---|
| Avco Lycoming (Williamsport Division) Williamsport, Pennsylvania · EPA ID PAD003053709 | Active (final NPL) | 2.1 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 17703
Who supplies drinking water to ZIP 17703?
Williamsport Mun Water Auth (EPA ID PA4410173), a surface water (rivers, lakes) system serving about 51,000 people.
Is there lead in Williamsport, PA tap water?
The utility’s latest 90th-percentile lead result (Jun 2025) was 2 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 Williamsport, PA 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. 5 PFAS compounds detected.
Has the water system in 17703 had violations?
No health-based violations reported since 2016.
Are there Superfund sites near 17703?
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code. Sites within 10 miles: Avco Lycoming (Williamsport Division) (2.1 mi, Active (final NPL)).
Is radon a problem in Lycoming?
Lycoming is in EPA radon zone 1 (highest potential). Predicted average indoor radon above 4 pCi/L — EPA’s action level. Test your home.