Radon is a colorless, odorless radioactive gas that comes from the natural breakdown of uranium in soil and rock. It seeps into homes through cracks in foundations, gaps around pipes, sump pits, and other openings. Once inside, it can build up to levels that increase lung cancer risk over time.
In Rhode Island, the problem is more common than the national average. State data shows roughly one in four homes tests at or above the EPA action level of 4.0 pCi/L. In some towns such as Exeter and Richmond, more than half of tested homes exceed that threshold. The combination of glacial soils, older housing stock with basements or crawl spaces, and typical New England construction makes testing and, when needed, mitigation especially relevant here.
Radon mitigation is the process of installing a system that reduces indoor radon concentrations by preventing the gas from entering living spaces or by continuously removing it before it accumulates. When done correctly by a Rhode Island-licensed professional, these systems routinely lower levels by 50 to 99 percent.
Why Radon Mitigation Matters
Long-term exposure to elevated radon is the second leading cause of lung cancer in the United States after smoking, according to the EPA and CDC. The risk multiplies for smokers. There is no known safe level, though the EPA recommends action at 4.0 pCi/L and consideration of reduction between 2 and 4 pCi/L.
Mitigation protects the people who live in the home. It also protects the property’s marketability. Buyers and inspectors routinely check for radon during real estate transactions. An existing, verified mitigation system can remove a common contingency and give both parties confidence.
Rhode Island requires radon professionals who perform paid mitigation work to be licensed by the Department of Health. That licensing framework exists because improper work can leave levels high or, in some cases, make the problem worse.
Signs You May Need Radon Mitigation
The only reliable way to know whether mitigation is needed is a proper radon test. High levels produce no smell, no visible signs, and no immediate symptoms.
- A short-term or long-term test result at or above 4.0 pCi/L
- Results between 2 and 4 pCi/L, especially in homes where people spend significant time on lower levels
- A home purchase or refinance inspection that flags elevated radon
- Plans to finish a basement or convert lower-level space into living area
- Previous testing that showed elevated levels that were never addressed
If a test confirms elevated levels, a second confirmatory test is often recommended before installation, particularly when the first result is only slightly above the action level. Once confirmed, mitigation is the standard next step.
How Radon Mitigation Works
Most residential systems in Rhode Island use active soil depressurization (also called sub-slab depressurization or active soil depressurization). The principle is straightforward: create a zone of lower air pressure beneath the foundation so soil gas, including radon, is pulled into a pipe and vented outdoors instead of entering the house.
A typical installation includes these steps:
- A licensed contractor evaluates the foundation type (basement, slab-on-grade, crawl space, or combination), soil permeability under the slab, and any existing sump or drain-tile systems.
- One or more suction points are created. On a basement or slab home this usually means coring a hole through the concrete and excavating a small pit in the aggregate or soil below. In a crawl space a heavy plastic membrane is sealed over the soil and suction is applied beneath it.
- PVC pipe is run from the suction point(s) to a continuous-duty radon fan. The fan is almost always placed outside the living space—on an exterior wall, in an attic, or in a garage—so that any mechanical noise stays away from bedrooms and living areas.
- The pipe continues upward and terminates above the roofline, a required distance from windows, doors, and air intakes so the diluted gas disperses safely.
- Cracks, floor-wall joints, and other major openings are sealed to improve system performance and reduce energy loss.
- A simple visual indicator (usually a U-tube manometer) is installed so the homeowner can confirm the system is operating.
- After the system has run for at least 24 hours under closed-house conditions, a post-mitigation test is performed to verify the reduction.
Installation for a straightforward single-family home is typically completed in one day. More complex foundations or multi-section homes may take longer.
Related work that often accompanies or follows mitigation includes professional radon testing before and after installation, system inspections, and eventual fan replacement when the original unit reaches the end of its service life (commonly 5–15 years depending on the model and conditions).
Benefits of a Properly Installed System
A well-designed active system delivers measurable results. Most homes see radon levels drop well below 4.0 pCi/L, frequently into the 0.5–2.0 range. The reduction happens quickly—usually within 24 hours of the fan being turned on—and remains stable as long as the fan continues to run.
Additional practical benefits include:
- Continuous protection without daily effort from the homeowner
- Low operating cost (typically a few dollars per month in electricity)
- Potential secondary drying effect in damp basements or crawl spaces when the system is also managing soil moisture vapor
- Documentation that supports real-estate transactions
- Peace of mind for families, especially those with children or smokers in the household
Sealing alone is not considered reliable mitigation. It can help a system perform better, but it does not replace active soil depressurization.
Why Work with a Local Rhode Island Licensed Company
Rhode Island has its own licensing requirements for radon mitigation contractors. Local professionals are already familiar with the state’s older housing stock, common foundation types, winter weather effects on pipe routing and fan performance, and the Department of Health reporting expectations.
A local company can also schedule post-mitigation testing promptly and respond if a manometer shows the system has stopped working. National or out-of-state firms may not carry Rhode Island licensing or have the same practical knowledge of local conditions.
When selecting a contractor, homeowners should confirm current Rhode Island licensing, ask for references from similar homes, request a written contract that includes post-installation testing, and verify that the system will include a performance indicator and proper labeling.
Service Areas
Radon mitigation services are available throughout Rhode Island, including:
- Providence County (Providence, Cranston, Warwick, Pawtucket, East Providence, and surrounding communities)
- Kent County
- Washington County (including South County towns)
- Newport County
- Bristol County
Homes in every municipality can have elevated radon. Geology and construction details vary, so on-site evaluation remains essential.
Next Steps
If you have a recent test result at or above 4.0 pCi/L, or if you simply want clear information about the process for your specific home, contact a Rhode Island-licensed radon mitigation professional for an evaluation and written estimate. Many offer free phone consultations based on foundation type and test results.
Testing first remains the essential starting point. Kits are inexpensive and widely available, or a certified measurement professional can perform the test for you. Once levels are known, the path forward is usually straightforward.