What EPA's radon map says about Morris County

Morris County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. That puts Morris County in the 8th percentile nationally for radon potential — higher than 8% of the counties EPA has rated.

Morris County by the numbers

About 12,184 people live in Morris County, Texas, spread over 251.989 square miles. Population density there runs about 48 people per square mile. Among counties sharing Morris County's EPA zone, it outranks 26% of them by population. Geologically, Morris County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Zone vs. an actual test

At Zone 3, Morris 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, Morris County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Next steps for a home in Morris County

Mitigation cost doesn't depend on Morris 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

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