Hill County, TX radon potential

Hill County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Hill County sits at the 20th percentile nationally for radon potential — above 20 of every 100 rated counties.

How Hill County compares

Hill County, Texas is home to about 38,771 people across 958.859 square miles. Averaged across its land area, Hill County runs about 40 people per square mile. Within its own EPA zone, Hill County is bigger by population than 60% of the counties that share it. EPA's geology-based Region 6 groups Hill County with 502 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

A Zone 3 county like Hill County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Even at Zone 3, Hill County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Testing and mitigation in Hill County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Texas's state radon program

For Hill County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Hill County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

Where Hill County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Hill County's numbers. Whatever zone Hill County carries, the zone explainer covers what it does and doesn't tell you about any one house.