Scott County by the numbers
Local measurements and geology — not national boilerplate.
Every one of Iowa's 99 counties is EPA Zone 1 — Scott County included — and Iowa leads the nation with 71.6% of homes testing at or above the 4.0 pCi/L action level against a statewide average of roughly 7.6 pCi/L. What makes Scott County worth its own look: the county sits on glacial till over uranium-bearing bedrock along the Mississippi corridor, readings swing sharply house-to-house, and the Iowa HHS roster lists four credentialed mitigation companies based right in the Davenport–Bettendorf area — a real local bench, which is not true of many rural Zone 1 counties. Scott County Health Department (563-326-8618) has periodically offered discounted test kits to residents.
Sources: EPA Map of Radon Zones; Iowa HHS Radiological Health (Iowa Radon Survey); EPA (action level)
Credentials and program guidance are published by the state — check any contractor against the official roster.
Iowa HHS Radiological Health — official radon program & credential roster →Why readings swing so much within Scott County
Scott County sits on glacial till laid over uranium-bearing bedrock along the Mississippi — the same deposit that makes eastern Iowa one of the most radon-prone corridors in the country. That variability is the practical takeaway: county and state averages describe the odds, not your house. Two homes on the same Davenport street routinely test several pCi/L apart, because what matters is the soil directly under one foundation and how that one house moves air.
Iowa winters push readings up: the house is closed, the stack effect is strongest, and frozen ground caps the soil so gas migrates toward the foundation instead of venting. If you only ever run one test, a closed-house winter test is the conservative one.
- EPA Zone 1 — the highest-risk classification
- County-level readings cited to state survey data
- Real local geology, not a national boilerplate explanation
- Testing guidance matched to this climate
Related pages
Every page cites its sources — start where your question is.
Davenport Scott County Radon Levels — FAQ
Is every part of Scott County high-radon?
Where does the county data come from?
My neighborhood is new construction — am I safe?
How often should I retest?
Test your Scott County home
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