Is Pulaski County, IL a radon risk area?

EPA places Pulaski County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Pulaski County in the 3rd percentile nationally for radon potential — higher than 3% of the counties EPA has rated.

Where Pulaski County sits nationally

About 4,879 people live in Pulaski County, Illinois, spread over 199.269 square miles. Population density there runs about 24 people per square mile. Rank 943 by population within its EPA zone puts Pulaski County at the 9th percentile among zone peers. Pulaski County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Pulaski County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. A Zone 3 rating means Pulaski County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

If Pulaski County tests above the action level

Nothing about Pulaski County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Illinois's state radon program

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

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.