Home hazard report for 71766 — Thornton, AR
ZIP 71766 is served by Calhoun County Water ASSN: no health-based violations since 2016, latest lead result No data, PFAS not tested. Calhoun County is in EPA radon zone 3.
No health-based violations reported since 2016.
No lead sampling results on file for this system.
This system was not part of EPA’s 2023–2025 nationwide PFAS testing (UCMR 5 covers systems serving over 3,300 people and a sample of smaller ones).
Predicted average under 2 pCi/L — but any home can have high radon, so EPA still recommends a test.
FEMA’s overall natural-hazard risk for this census tract, relative to the rest of the U.S.
No active Superfund site within 10 miles of the ZIP center.
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Where ZIP 71766 is
Dashed: ZIP area · blue: utility service area · scroll or pinch to zoomDrinking water: Calhoun County Water ASSN
Health-based violations
No health-based violations reported since 2016.
Full record for Calhoun County Water ASSN →
Other systems overlapping this ZIP: Thornton Waterworks.
Lead
No lead sampling results on file.
PFAS (“forever chemicals”)
This system was not part of EPA’s 2023–2025 nationwide PFAS testing (UCMR 5).
Radon in Calhoun County
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 →
Natural hazard risk
FEMA rates the overall natural-hazard risk of this neighborhood (census tract) as Relatively Low, with relatively low social vulnerability and very low 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
No site on EPA’s Superfund National Priorities List lies within 10 miles of the center of this ZIP code.
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 71766
Who supplies drinking water to ZIP 71766?
Calhoun County Water ASSN (EPA ID AR0000919), a groundwater (wells) system serving about 1,591 people.
Is there lead in Thornton, AR tap water?
No lead sampling results are on file for this system.
Does Thornton, AR water have PFAS?
This system was not part of EPA’s 2023–2025 nationwide PFAS testing (UCMR 5 covers systems serving over 3,300 people and a sample of smaller ones).
Has the water system in 71766 had violations?
No health-based violations reported since 2016.
What natural hazards affect ZIP 71766?
FEMA’s National Risk Index rates the overall natural-hazard risk here as Relatively Low; the highest-rated hazards are ice storm (very high), lightning (relatively high), strong wind (relatively high).
Are there Superfund sites near 71766?
No active Superfund site within 10 miles of the ZIP center.
Is radon a problem in Calhoun County?
Calhoun County 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.