What EPA's radon map says about Stafford County

EPA's own radon map rates Stafford County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. That puts Stafford County in the 96th percentile nationally for radon potential — higher than 96% of the counties EPA has rated.

How Stafford County compares

About 168,919 people live in Stafford County, Virginia, spread over 268.489 square miles. Averaged across its land area, Stafford County runs about 629 people per square mile. Among counties sharing Stafford County's EPA zone, it outranks 89% of them by population. EPA's geology-based Region 3 groups Stafford County with 244 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Stafford 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 Stafford 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 Stafford County

Mitigation cost doesn't depend on Stafford County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Virginia's state radon program

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

More on how this number was built

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