What EPA's radon map says about San Saba County

EPA places San Saba County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. San Saba County sits at the 3rd percentile nationally for radon potential — above 3 of every 100 rated counties.

Where San Saba County sits nationally

About 5,508 people live in San Saba County, Texas, spread over 1,135.313 square miles. Population density there runs about 5 people per square mile. Among counties sharing San Saba County's EPA zone, it outranks 10% of them by population. San Saba County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

At Zone 3, San Saba County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Even at Zone 3, San Saba County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

If San Saba County tests above the action level

Mitigation cost doesn't depend on San Saba 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

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

San Saba County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone San Saba County carries, the zone explainer covers what it does and doesn't tell you about any one house.