What EPA's radon map says about Camas County
EPA places Camas 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. That puts Camas County in the 66th percentile nationally for radon potential — higher than 66% of the counties EPA has rated.
Where Camas County sits nationally
About 1,247 people live in Camas County, Idaho, spread over 1,074.234 square miles. Averaged across its land area, Camas County runs about 1 people per square mile. Among counties sharing Camas County's EPA zone, it outranks 1% of them by population. Camas County falls in EPA Radon Region 10, one of 142 counties nationally EPA assigns to that same geologic province.
Why the zone isn't the answer by itself
Where the national indoor average runs about 1.3 pCi/L, Camas County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Camas County will test well under the action level, and EPA's guidance is to test regardless of zone.
Testing and mitigation in Camas County
Mitigation cost doesn't depend on Camas 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 Idaho's state radon program
Camas County's test kit answers today; a Airthings radon monitor keeps answering for Camas County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.
More on how this number was built
Camas County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Camas County carries, the zone explainer covers what it does and doesn't tell you about any one house.