What EPA's radon map says about Providence County

EPA places Providence County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Providence County sits at the 65th percentile nationally for radon potential — above 65 of every 100 rated counties.

Providence County by the numbers

About 675,912 people live in Providence County, Rhode Island, spread over 409.484 square miles. Population density there runs about 1,651 people per square mile. Among counties sharing Providence County's EPA zone, it outranks 97% of them by population. EPA's geology-based Region 1 groups Providence County with 58 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

EPA's Zone 2 rating for Providence 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 Providence County's, can still hide a specific house well above or below it — testing is what actually answers the question.

If Providence County tests above the action level

Mitigation cost doesn't depend on Providence 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 Rhode Island's state radon program

Providence County's test kit answers today; a Airthings radon monitor keeps answering for Providence 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. Whatever zone Providence County carries, the zone explainer covers what it does and doesn't tell you about any one house.