Radon levels by town in Rhode Island

The Rhode Island Department of Health groups each city and town by the share of tested homes that came back at or above the EPA action level of 4.0 pCi/L. The figures come from 59,791 homes in the department's radon database as of August 2021. The department publishes ranges, not exact percentages.

Greater than 50%	Exeter Richmond
30–50%	Charlestown Coventry East Greenwich Foster Hopkinton Little Compton North Kingstown Portsmouth Scituate South Kingstown Tiverton West Greenwich West Warwick
10–30%	Barrington Bristol Burrillville Cranston Cumberland Glocester Jamestown Johnston Lincoln Middletown Narragansett Newport North Providence North Smithfield Pawtucket Smithfield Warren Warwick Westerly Woonsocket
Less than 10%	Central Falls East Providence New Shoreham Providence

A town's range describes homes that were tested. It can't tell you the level in your house. A low range doesn't mean a low level in your house, and the only way to know is to test.