Is Todd County, MN a radon risk area?

EPA places Todd County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Todd County lands in the 84th percentile for radon potential.

How Todd County compares

About 25,955 people live in Todd County, Minnesota, spread over 945.098 square miles. Averaged across its land area, Todd County runs about 27 people per square mile. Rank 505 by population within its EPA zone puts Todd County at the 53rd percentile among zone peers. Todd County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Todd County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Todd County will test well under the action level, and EPA's guidance is to test regardless of zone.

If Todd County tests above the action level

Nothing about Todd County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Minnesota's state radon program

Todd County's test kit answers today; a Airthings radon monitor keeps answering for Todd County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.