What EPA's radon map says about Lawrence County

Lawrence County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Nationally, Lawrence County ranks higher in radon potential than 43% of rated counties (the 43rd percentile).

Lawrence County by the numbers

About 14,801 people live in Lawrence County, Illinois, spread over 372.179 square miles. Population density there runs about 40 people per square mile. Among counties sharing Lawrence County's EPA zone, it outranks 31% of them by population. Lawrence 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

EPA's Zone 2 rating for Lawrence County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Middle-of-the-pack doesn't mean risk-free for any one Lawrence County address — a moderate county average still leaves individual homes to test either side of it.

Testing and mitigation in Lawrence County

Mitigation cost doesn't depend on Lawrence 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 Illinois's state radon program

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

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