What EPA's radon map says about Prowers County

EPA places Prowers County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 77th percentile for radon potential — Prowers County outranks 77% of every county EPA has rated.

Prowers County by the numbers

About 11,957 people live in Prowers County, Colorado, spread over 1,638.407 square miles. Population density there runs about 7 people per square mile. Among counties sharing Prowers County's EPA zone, it outranks 32% of them by population. EPA's geology-based Region 8 groups Prowers County with 290 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Prowers County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. Some Prowers County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Next steps for a home in Prowers County

Mitigation cost doesn't depend on Prowers 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 Colorado's state radon program

Prowers County's test kit answers today; a Airthings radon monitor keeps answering for Prowers County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

Prowers 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.