Home hazard report for 18104 — Allentown, PA
ZIP 18104 is served by SWT Main System: 1 violation since 2016, latest lead result 6 ppb, PFAS 4 ppt. Lehigh County is in EPA radon zone 1.
Health-based violations since 2016: Surface Water Treatment Rule. All are listed as resolved.
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. 3 PFAS compounds detected.
Predicted average indoor radon above 4 pCi/L — EPA’s action level. Test your home.
FEMA’s overall natural-hazard risk for this census tract, relative to the rest of the U.S.
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code.
Active weather alerts
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Where ZIP 18104 is
Dashed: ZIP area · blue: utility service area · scroll or pinch to zoomDrinking water: SWT Main System
Health-based violations
| Contaminant or rule | Health-based violations since 2016 |
|---|---|
| Surface Water Treatment Rule | 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 Sep 2016.
Full record for SWT Main System →
Other systems overlapping this ZIP: Lca Allentown Division, Lca Wlsa Central Division, SWT Allentown Cons System.
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 | 10.1 ppt | 16 of 22 | — |
| PFHxA | 5.4 ppt | 8 of 22 | — |
| PFOA | 4 ppt | 1 of 22 | 4 ppt MCL |
| PFBA | not detected | 0 of 22 | — |
| PFHpA | not detected | 0 of 22 | — |
| PFHxS | not detected | 0 of 22 | — |
| PFNA | not detected | 0 of 22 | — |
| PFBS | not detected | 0 of 22 | — |
| PFOS | not detected | 0 of 22 | 4 ppt MCL |
| PFDA | not detected | 0 of 22 | — |
| HFPO-DA (GenX) | not detected | 0 of 22 | — |
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 Lehigh County
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 →
Natural hazard risk
FEMA rates the overall natural-hazard risk of this neighborhood (census tract) as Relatively Moderate, with relatively low social vulnerability and relatively high community resilience.
FEMA National Risk Index (December 2025): expected annual losses from each hazard combined with social vulnerability and community resilience, rated relative to all U.S. census tracts. Hazards not listed are not applicable here. It describes the area, not a single building; flood insurance maps (FEMA FIRMs) decide flood-insurance requirements.
Live conditions: river gauges and flood levels · tornado warnings · wildfire detections · earthquakes — our sister maps, updated from NOAA, USGS and NASA every few minutes.
Superfund sites nearby
| Site | Status | Distance |
|---|---|---|
| Novak Sanitary Landfill South Whitehall Township, Pennsylvania · EPA ID PAD079160842 | Active (final NPL) | 1.7 mi |
| Heleva Landfill North Whitehall Township, Pennsylvania · EPA ID PAD980537716 | Active (final NPL) | 4.2 mi |
| Reeser's Landfill Upper Macungie Township, Pennsylvania · EPA ID PAD980829261 | Cleaned up & deleted | 6.2 mi |
| Rodale Manufacturing Co., Inc. Emmaus Borough, Pennsylvania · EPA ID PAD981033285 | Active (final NPL) | 6.2 mi |
| Hebelka Auto Salvage Yard Weisenberg Township, Pennsylvania · EPA ID PAD980829329 | Cleaned up & deleted | 6.8 mi |
| Voortman Farm Upper Saucon Township, Pennsylvania · EPA ID PAD980692719 | Cleaned up & deleted | 6.9 mi |
| Dorney Road Landfill Upper Macungie Township, Pennsylvania · EPA ID PAD980508832 | Cleaned up & deleted | 8.1 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 18104
Who supplies drinking water to ZIP 18104?
SWT Main System (EPA ID PA3390065), a surface water (rivers, lakes) system serving about 14,500 people.
Is there lead in Allentown, PA tap water?
The utility’s latest 90th-percentile lead result (Jun 2025) was 6 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 Allentown, 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. 3 PFAS compounds detected.
Has the water system in 18104 had violations?
Health-based violations since 2016: Surface Water Treatment Rule. All are listed as resolved.
What natural hazards affect ZIP 18104?
FEMA’s National Risk Index rates the overall natural-hazard risk here as Relatively Moderate; the highest-rated hazards are cold wave (relatively high), lightning (relatively high), riverine flooding (relatively high).
Are there Superfund sites near 18104?
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code. Sites within 10 miles: Novak Sanitary Landfill (1.7 mi, Active (final NPL)); Heleva Landfill (4.2 mi, Active (final NPL)); Reeser's Landfill (6.2 mi, Cleaned up & deleted).
Is radon a problem in Lehigh County?
Lehigh County is in EPA radon zone 1 (highest potential). Predicted average indoor radon above 4 pCi/L — EPA’s action level. Test your home.