Is Spotsylvania County, VA a radon risk area?

EPA's own radon map rates Spotsylvania County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Spotsylvania County sits at the 96th percentile nationally for radon potential — above 96 of every 100 rated counties.

Spotsylvania County by the numbers

About 152,021 people live in Spotsylvania County, Virginia, spread over 401.942 square miles. Population density there runs about 378 people per square mile. Rank 135 by population within its EPA zone puts Spotsylvania County at the 87th percentile among zone peers. EPA's geology-based Region 3 groups Spotsylvania County with 244 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Spotsylvania County

Spotsylvania County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. 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 Spotsylvania County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Spotsylvania County

Nothing about Spotsylvania 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 Virginia's state radon program

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

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.