Radon in Rhode Island
About 1 in 4 homes tested in Rhode Island were at or above the EPA action level of 4 pCi/L.
- Below 2 pCi/L: 51%
- 2 to 4 pCi/L: 26%
- 4 pCi/L or more: 24%
The EPA puts 2 of Rhode Island's 5 counties in Zone 1, its highest radon category, 2 in Zone 2 and 1 in Zone 3.
Every county in Rhode Island
Sorted by the share of homes tested at or above 4 pCi/L. Select a county for local details and costs.
| County | Homes tested | At or above 4 | Median | EPA zone |
|---|---|---|---|---|
| Washington County | 39% | 3.0 pCi/L | 1 | |
| Kent County | 26% | 2.1 pCi/L | 1 | |
| Newport County | 24% | 1.9 pCi/L | 2 | |
| Providence County | 17% | 1.6 pCi/L | 2 | |
| Bristol County | 15% | 1.6 pCi/L | 3 |
"–" means fewer than 20 tests or no lab data, too few for a reliable figure.
Sources
- EPA Map of Radon Zones (public domain).
- CDC Environmental Public Health Tracking Network, radon tests from labs, 2008–2017. Pre-mitigation tests only.
Last updated October 2026. How we calculate these numbers.