Home hazard report for 21010 — Gunpowder, MD
ZIP 21010 is served by Chapel Hill - Aberdeen Proving Grounds (as listed by the state): no health-based violations since 2016, latest lead result 0 ppb, PFAS not detected. Harford County is in EPA radon zone 1.
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.
None of the tested PFAS were found above EPA’s reporting limits in 2023–2025.
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 21010 is
Dashed: ZIP area · blue: utility service area · scroll or pinch to zoomDrinking water: Chapel Hill - Aberdeen Proving Grounds
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 |
|---|---|---|---|
| PFHpA | not detected | 0 of 2 | — |
| PFNA | not detected | 0 of 2 | — |
| PFBA | not detected | 0 of 2 | — |
| HFPO-DA (GenX) | not detected | 0 of 2 | — |
| PFHxA | not detected | 0 of 2 | — |
| PFDA | not detected | 0 of 2 | — |
| PFOA | not detected | 0 of 2 | 4 ppt MCL |
| PFOS | not detected | 0 of 2 | 4 ppt MCL |
| PFPeA | not detected | 0 of 2 | — |
| PFBS | not detected | 0 of 2 | — |
| PFHxS | not detected | 0 of 2 | — |
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 Harford 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 Very Low, with very low 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 |
|---|---|---|
| Aberdeen Proving Ground (Edgewood Area) Edgewood, Maryland · EPA ID MD2210020036 | Active (final NPL) | <1 mi |
| Bush Valley Landfill Abingdon, Maryland · EPA ID MDD980504195 | Active (final NPL) | 5.5 mi |
| Aberdeen Proving Ground (Michaelsville Landfill) Aberdeen, Maryland · EPA ID MD3210021355 | Active (final NPL) | 9.4 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 21010
Who supplies drinking water to ZIP 21010?
Chapel Hill - Aberdeen Proving Grounds (EPA ID MD0120002), a groundwater (wells) system serving about 15,000 people, listed by the state as serving this ZIP code.
Is there lead in Gunpowder, MD tap water?
The utility’s latest 90th-percentile lead result (Jan 2021) was 0 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 Gunpowder, MD water have PFAS?
None of the tested PFAS were found above EPA’s reporting limits in 2023–2025.
Has the water system in 21010 had violations?
No health-based violations reported since 2016.
What natural hazards affect ZIP 21010?
FEMA’s National Risk Index rates the overall natural-hazard risk here as Very Low; the highest-rated hazards are winter weather (relatively moderate), coastal flooding (relatively low), cold wave (relatively low).
Are there Superfund sites near 21010?
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code. Sites within 10 miles: Aberdeen Proving Ground (Edgewood Area) (0.9 mi, Active (final NPL)); Bush Valley Landfill (5.5 mi, Active (final NPL)); Aberdeen Proving Ground (Michaelsville Landfill) (9.4 mi, Active (final NPL)).
Is radon a problem in Harford County?
Harford County is in EPA radon zone 1 (highest potential). Predicted average indoor radon above 4 pCi/L — EPA’s action level. Test your home.