What EPA's radon map says about Wythe County

Wythe County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. That puts Wythe County in the 85th percentile nationally for radon potential — higher than 85% of the counties EPA has rated.

How Wythe County compares

About 28,100 people live in Wythe County, Virginia, spread over 461.952 square miles. Averaged across its land area, Wythe County runs about 61 people per square mile. Among counties sharing Wythe County's EPA zone, it outranks 55% of them by population. EPA's geology-based Region 3 groups Wythe County with 244 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Wythe 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 Wythe County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Wythe County

Mitigation cost doesn't depend on Wythe 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

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

Wythe County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.