Is Pembina County, ND a radon risk area?

Pembina County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally that's the 72nd percentile for radon potential — Pembina County outranks 72% of every county EPA has rated.

Where Pembina County sits nationally

About 6,588 people live in Pembina County, North Dakota, spread over 1,118.535 square miles. That works out to roughly 6 people per square mile. Rank 863 by population within its EPA zone puts Pembina County at the 19th percentile among zone peers. Geologically, Pembina County is grouped into EPA Region 8 alongside 290 other counties that share its rock and soil setting.

What this actually means for a house in Pembina County

Pembina 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. That doesn't mean every Pembina County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Next steps for a home in Pembina County

Nothing about Pembina 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 North Dakota's state radon program

Pembina County's test kit answers today; a Airthings radon monitor keeps answering for Pembina 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

The methodology guide shows exactly which EPA and Census sources feed Pembina County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.