Montgomery County, TX Radon Zone Data

Montgomery County, TX radon potential

Montgomery 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 Montgomery County in the 32nd percentile nationally for radon potential — higher than 32% of the counties EPA has rated.

Where Montgomery County sits nationally

Montgomery County, Texas is home to about 749,613 people across 1,042.178 square miles. Averaged across its land area, Montgomery County runs about 719 people per square mile. Within its own EPA zone, Montgomery County is bigger by population than 96% of the counties that share it. Montgomery 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 Montgomery County

Montgomery 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. Even at Zone 3, Montgomery 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 Montgomery 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 Montgomery County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Montgomery 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 Montgomery County's figures come from

Montgomery 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.