Radon Mitigation in Eau Claire, WI
Radon mitigation in the Chippewa Valley is almost always done with an active sub-slab depressurization system. A 4–5" core hole goes through the basement slab, a PVC pipe is sealed in, and a radon fan installed outside or in the attic pulls soil gas from under the slab and exhausts it above the roofline. After install, a post-mitigation retest confirms the home is below 4.0 pCi/L.
What's included
- Site walkthrough and suction-point selection
- Slab core, suction pit, sealed PVC pipe
- Mitigation fan rated for the home's slab area
- Discharge stack terminating above the eaves, code-compliant placement
- U-tube manometer mounted on the visible riser
- Sealing of major slab penetrations (sump, expansion joints, plumbing)
- System label, warranty paperwork, and operating manual
- Post-mitigation short-term retest
Pricing
Standard single-zone basement mitigation typically runs $1,200–$2,200 in the Chippewa Valley. Complex layouts — finished basements with limited chase access, drain-tile suction systems, multi-zone slabs, separate crawl spaces — run higher. Pricing is confirmed in writing as a fixed quote before any work starts. No add-ons after the fact.
Timeline
- Walkthrough scheduled within a few days of the call.
- Quote sent same day or next.
- Install scheduled, typically within one to two weeks.
- Install itself: four to six hours for most single-zone basements.
- Post-mitigation retest: 24–48 hours after the fan is energized.
- Final report with retest results emailed to the homeowner.
Warranty
Mitigation fans typically carry a five-year manufacturer warranty. Workmanship warranties of one to two years are standard. If the post-mitigation retest doesn't read below 4.0 pCi/L, adjustments (additional sealing, second suction point, fan upgrade) are made at no additional cost.
Need a radon test or mitigation system in the Chippewa Valley?
Same-week appointments are typical. Real-estate-deadline tests can usually be slotted in 24–48 hours.
Frequently asked questions
How effective is mitigation?
A properly designed active sub-slab system reliably brings homes from 10–20 pCi/L down below 2 pCi/L. Homes that come in at 30+ pCi/L can usually be brought below 4 pCi/L; sometimes a second suction point is needed.
Where is the fan placed?
Mitigation fans must be installed in non-habitable space — typically an attic or on the exterior wall. They cannot be in basements or living spaces, because if the suction-side pipe leaks, the fan would be pushing radon-laden air into the home.
How loud is it?
Fan noise at the unit itself is comparable to a bath exhaust fan. Inside the home, most installs are inaudible from any living space. Vibration isolators on the fan and a flexible coupling on the pipe keep stack noise out of the structure.
Will the system raise my heating bill?
A small amount. The fan pulls a few cubic feet per minute of conditioned air through cracks in the slab. The annual electric and HVAC cost combined is typically $80–$150.
What about radon in well water?
Most Chippewa Valley homes are on municipal water. Private well users with high airborne radon should also test the water — radon dissolved in water can off-gas during showers and laundry. Mitigation for waterborne radon is a separate aerator system, not the sub-slab fan.
Other radon services
Before mitigation, a radon test is almost always run. The technique used in most homes is sub-slab depressurization. After install, a post-mitigation retest is required. If an existing system has stopped working, see radon system inspection.