Home hazard report for 19437 — Gwynedd Valley, PA
ZIP 19437 is served by North Wales Water Authority: no health-based violations since 2016, latest lead result 1.6 ppb, PFAS 13 ppt. Montgomery County 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. 9 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
live from the National Weather ServiceChecking the National Weather Service…
Where ZIP 19437 is
Dashed: ZIP area · blue: utility service area · scroll or pinch to zoomDrinking water: North Wales 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 |
|---|---|---|---|
| PFOA | 13 ppt | 12 of 16 | 4 ppt MCL |
| PFOS | 11.1 ppt | 11 of 16 | 4 ppt MCL |
| PFPeA | 9.3 ppt | 10 of 16 | — |
| PFHxA | 8.1 ppt | 10 of 16 | — |
| PFBA | 6.8 ppt | 3 of 16 | — |
| PFBS | 6.4 ppt | 12 of 16 | — |
| PFHpA | 5.8 ppt | 7 of 16 | — |
| PFNA | 5.6 ppt | 1 of 16 | — |
| PFHxS | 3.7 ppt | 2 of 16 | — |
| HFPO-DA (GenX) | not detected | 0 of 16 | — |
| PFDA | not detected | 0 of 16 | — |
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 Montgomery 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 High, with relatively moderate social vulnerability and very 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 |
|---|---|---|
| BoRit Asbestos Ambler, Pennsylvania · EPA ID PAD981034887 | Active (final NPL) | 2.5 mi |
| Ambler Asbestos Piles Ambler, Pennsylvania · EPA ID PAD000436436 | Cleaned up & deleted | 2.7 mi |
| North Penn - Area 7 North Wales, Pennsylvania · EPA ID PAD002498632 | Active (final NPL) | 2.8 mi |
| North Penn - Area 12 Worcester, Pennsylvania · EPA ID PAD057152365 | Active (final NPL) | 4.9 mi |
| North Penn - Area 6 Lansdale, Pennsylvania · EPA ID PAD980926976 | Active (final NPL) | 5.1 mi |
| Willow Grove Naval Air and Air Reserve Station Willow Grove, Pennsylvania · EPA ID PAD987277837 | Active (final NPL) | 6.0 mi |
| North Penn - Area 5 Montgomery Township, Pennsylvania · EPA ID PAD980692693 | Active (final NPL) | 6.4 mi |
| Tysons Dump Upper Merion Township, Pennsylvania · EPA ID PAD980692024 | Active (final NPL) | 7.2 mi |
| Crater Resources, Inc./Keystone Coke Co./Alan Wood Steel Co. Upper Merion Township, Pennsylvania · EPA ID PAD980419097 | Active (final NPL) | 8.1 mi |
| North Penn - Area 2 Hatfield, Pennsylvania · EPA ID PAD002342475 | Active (final NPL) | 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 19437
Who supplies drinking water to ZIP 19437?
North Wales Water Authority (EPA ID PA1460048), a surface water (rivers, lakes) system serving about 72,496 people.
Is there lead in Gwynedd Valley, PA tap water?
The utility’s latest 90th-percentile lead result (Jun 2025) was 1.6 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 Gwynedd Valley, 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. 9 PFAS compounds detected.
Has the water system in 19437 had violations?
No health-based violations reported since 2016.
What natural hazards affect ZIP 19437?
FEMA’s National Risk Index rates the overall natural-hazard risk here as Relatively High; the highest-rated hazards are riverine flooding (very high), winter weather (very high), cold wave (relatively high).
Are there Superfund sites near 19437?
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code. Sites within 10 miles: BoRit Asbestos (2.5 mi, Active (final NPL)); Ambler Asbestos Piles (2.7 mi, Cleaned up & deleted); North Penn - Area 7 (2.8 mi, Active (final NPL)).
Is radon a problem in Montgomery County?
Montgomery County is in EPA radon zone 1 (highest potential). Predicted average indoor radon above 4 pCi/L — EPA’s action level. Test your home.