Does radon mitigation work?

Yes. Properly installed systems typically reduce radon levels significantly. Post-mitigation testing confirms performance.

Radon Levels, Testing and Mitigation in Rhode Island

Q: What radon level is considered high?

The EPA action level is 4.0 pCi/L. Many homeowners also choose to fix levels between 2.0 and 4.0 pCi/L.

Q: How much does radon mitigation cost in Rhode Island?

Radon mitigation typically costs between $800 and $2,500 depending on foundation type and severity.

Rhode Island has 5 counties, with 2 classified as EPA Zone 1 (highest risk). With an average radon level of 7.29 pCi/L, Rhode Island state testing data reveals significantly elevated risks across multiple counties. Testing is highly recommended.

Rhode Island is the 33rd most expansive state in terms of size and the 6th most populous. It also happens to be the 9th most densely populated state in the entire country.

Rhode Island does have an active radon program, dedicated to educating citizens about the risks associated with the deadly gas. You can find more information on Radon, testing and mitigation at the official page.

7.29

Avg. pCi/L

Counties

Zone 1 Counties

Rhode Island Radon Map

Zone 1 — High

Zone 2 — Moderate

Zone 3 — Low

Rhode Island Metro Areas

Explore radon data organized by metro region, including average levels, hotspot cities, and local mitigation professionals.

Providence Metro

5 cities

Most Active Radon Markets in Rhode Island

Cities with the most user-submitted radon test data, ranked by number of submissions.

City	Avg User Radon Level	Submissions
Providence	11.00 pCi/L	2
Westerly	8.00 pCi/L	2
Portsmouth	4.50 pCi/L	2

Rhode Island Counties by EPA Radon Zone

All 5 Rhode Island counties with their EPA radon zone classification and user-submitted average radon levels.

Zone 1 — High Risk

Predicted avg. indoor levels > 4.0 pCi/L

Zone 1 2 counties

Kent County Zone 1

Avg: 8.4 pCi/L

Washington County Zone 1

Avg: 7.0 pCi/L

Zone 2 — Moderate Risk

Predicted avg. indoor levels 2–4 pCi/L

Zone 2 2 counties

Newport County Zone 2

Avg: 7.5 pCi/L

Providence County Zone 2

Avg: 6.7 pCi/L

Zone 3 — Low Risk

Predicted avg. indoor levels < 2 pCi/L

Zone 3 1 counties

Bristol County Zone 3

Avg: 3.0 pCi/L

Rhode Island Cities & Towns

Browse radon data for individual cities across Rhode Island. Each city page includes user-submitted radon levels, local contractors, and mitigation resources.

Ashaway Barrington Bradford Bristol Carolina Central Falls Charlestown Chepachet Clayville Coventry Cranston Cumberland East Greenwich East Providence Exeter Foster Greene Greenville Harrisville Hope Hope Valley Hopkinton Jamestown Johnston Kenyon Kingston Lincoln Little Compton Manville Mapleville Middletown Narragansett Newport North Kingstown North Providence North Scituate North Smithfield Oakland Pascoag Pawtucket Portsmouth Providence Riverside Rumford Saunderstown Shannock Slatersville Slocum Smithfield Tiverton Wakefield Warren Warwick West Greenwich West Kingston West Warwick Westerly Wood River Junction Woonsocket Wyoming

Frequently Asked Questions About Radon in Rhode Island

What radon level is considered "high"?

The EPA action level is 4.0 pCi/L — many homeowners also choose to fix levels between 2.0 and 4.0 pCi/L. Any home with levels at or above 4.0 pCi/L should be mitigated.

How much does radon mitigation cost in Rhode Island?

Radon mitigation typically costs between $800 and $2,500, depending on foundation type and radon severity. A standard sub-slab depressurization system usually falls in the $1,000–$1,500 range.

Does mitigation actually work?

Yes — properly installed systems typically reduce radon levels by up to 99%. A post-mitigation test confirms the system is working correctly, and many homeowners re-test periodically.

Should I test again after mitigation?

Yes. A post-mitigation test is the proof your system is working. The EPA recommends testing within 30 days of installation and retesting every two years.

What EPA Radon Zone is my Rhode Island county in?

Rhode Island counties are classified into three EPA Radon Zones. Zone 1 (highest risk, >4 pCi/L) indicates the most concern. Zone 2 (moderate, 2–4 pCi/L) and Zone 3 (lowest, <2 pCi/L) round out the classification. Use the county directory above to find your specific county's zone and data.