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Radon Testing · Johnston, IA

Radon Testing in Johnston

Radon Testing in Johnston, IA by Closer Look Inspectors. A photo-mapped digital report within 24 hours.

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Johnston · Polk County

Radon Testing in Johnston

Radon Testing in Johnston, Polk County, by Closer Look Inspectors. Johnston is a fast-grown northwest-metro suburb of 1990s-2020s subdivisions above the Des Moines River valley.

Radon testing places an EPA-protocol continuous monitor on a home's lowest livable level to measure radon gas — and it matters across Iowa, where Iowa HHS reports 71.6 percent of homes above the action level — the largest percentage of any state.

Johnston is served by our Des Moines team →  ·  (563) 517-7815

Single-story yellow brick rambler with attached garage — Radon Testing in Johnston, IAJohnston
Local housing

Homes in Johnston.

Johnston housing runs to 1990s-2020s subdivisions with pockets of older acreage stock, across the newer subdivisions and the Des Moines River valley edge, on Des Moines Lobe till breaking into the river valley slope — and that mix shapes what a radon testing here needs to find.

Local conditions in Johnston

Johnston sits on Des Moines Lobe till — heavy, poorly drained clay that holds water against foundations and moves with moisture, which is what drives basement seepage and foundation cracking across central Iowa. Johnston sits in Polk County, and every Iowa county is EPA Radon Zone 1. Iowa HHS reports Iowa has the largest percentage of homes above the 4.0 pCi/L action level of any state — 71.6 percent in the Iowa Radon Survey — and the Iowa seller disclosure form asks for any known radon test results. Finished basements concentrate it, and only a 48-hour test gives you this home's number. Iowa leaves frost depth to the local building code rather than one statewide number, and the annual freeze-thaw cycle drives the settlement cracks and ice-dam wear that Johnston-area homes face.

Home inspection in Johnston →  ·  More about radon testing →

Questions

Common questions.

Is radon really a concern in Iowa?
Yes. The Iowa Department of Natural Resources reports that more than two in five Iowa homes have radon levels that pose a significant health risk, and finished basements are where it concentrates.
How long does the test run?
A 48-hour minimum under closed-house conditions; the result is delivered with your inspection report.
What should Johnston buyers watch for?
Most of the city is 1990s-2000s stock now hitting its first roof and mechanical replacement cycle, and on heavy lobe till the grading question never goes away. Lots that step down toward the Des Moines River valley add slope drainage and settlement to the read. Radon is the standing Iowa priority — Polk County is Zone 1 and Iowa HHS reports 71.6 percent of Iowa homes test above the 4.0 pCi/L action level.
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