Highest result per tested property in Clay County
| Result | Share | EPA guidance |
|---|---|---|
| Below 2 pCi/L | 20% | Below EPA's levels |
| 2 to 4 pCi/L | 21% | Consider fixing |
| 4 pCi/L or more | 59% | EPA recommends fixing |
What the data shows
- Higher share of high results than 58 of 87 Minnesota counties.
- Higher than 3 of 4 neighbouring counties.
- 80% of results at or above 2 pCi/L.
- 1 in 20 results above 17.8 pCi/L.
- Median result 4.7 pCi/L: at or above the 4 pCi/L action level.
How Clay County compares
Data table
| Area | Properties ≥ 4 pCi/L |
|---|---|
| Otter Tail County | 60% |
| Clay County | 59% |
| Norman County | 58% |
| Becker County | 54% |
| Wilkin County | 53% |
Same source as Clay County. Other bordering counties: Cass County, North Dakota, Richland County, North Dakota.
What it means for your home
More than half of all results in Clay County were at or above 4 pCi/L, where the EPA recommends a fix. Only a test shows your own home's level.
Levels in pCi/L from the EPA. The WHO reference level is 100 Bq/m³, about 2.7 pCi/L.
Test your home
Start with a short-term test (2–90 days) and confirm a result of 4 pCi/L or more with a second test. EPA guide
Sponsored: we earn a commission on purchases through these links. We haven't tested Airthings monitors yet.
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Fixing high radon
No local job records yet. National range: $800–$2,500, average $1,200 (EPA, 2003). Cost guide →
Minnesota licenses radon mitigators. Source
Buying or selling here
Minnesota's Radon Awareness Act requires sellers to disclose in writing any known radon tests, results and mitigation, and to give buyers the Department of Health publication "Radon in Real Estate Transactions" (Minn. Stat. § 144.496). Source
Checked against the official text on 2026-11-03. Not legal advice.
About this data
Source: Minnesota county radon testing indicators (Minnesota Department of Health). Period: 2016–2025. Published indicators: 1,241 properties at or above 4 pCi/L, 1,673 at or above 2 pCi/L, and 209 properties tested annually on average. Read the methodology →
These are voluntary and real-estate tests, not a random sample of homes, so they describe tested homes rather than every home.
About this page
Published by Ray Roman, editor of Radon by County. Figures are loaded from the cited source and spot-checked against it. Editorial policy · About us