Parmer County, TX: EPA's radon zone, explained

EPA's own radon map rates Parmer County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 40th percentile for radon potential — Parmer County outranks 40% of every county EPA has rated.

Parmer County by the numbers

Parmer County, Texas is home to about 9,669 people across 880.822 square miles. Averaged across its land area, Parmer County runs about 11 people per square mile. By population, Parmer County is the 827th largest of every county sharing its EPA zone — the 20th percentile by population within that zone. Parmer County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

EPA's Zone 2 rating for Parmer County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A county-wide moderate average, like Parmer County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Testing and mitigation in Parmer County

For a Parmer County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Texas's state radon program

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

Where Parmer County's figures come from

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