What EPA's radon map says about Dawson County

Dawson County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Dawson County sits at the 8th percentile nationally for radon potential — above 8 of every 100 rated counties.

Dawson County by the numbers

About 11,758 people live in Dawson County, Texas, spread over 900.309 square miles. Averaged across its land area, Dawson County runs about 13 people per square mile. Among counties sharing Dawson County's EPA zone, it outranks 25% of them by population. Dawson County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Dawson County

Dawson County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. A Zone 3 rating means Dawson County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Testing and mitigation in Dawson County

Mitigation cost doesn't depend on Dawson 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 Texas's state radon program

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

Dawson County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.