What a Radon Mitigation System Actually Does
You tested your home, the number came back at or above 4 pCi/L, and now someone’s telling you that you need a “radon mitigation system.” Fair questions follow: what is it, what does it actually do, and does it work? Here’s the plain-English version.
A Quick Radon Refresher
Radon is a naturally occurring radioactive gas that seeps up from the soil and enters homes through cracks, sump pits, floor drains, and gaps in the foundation. You can’t see it or smell it — the only way to know your level is to test. It matters because, per the EPA, radon is the leading cause of lung cancer among nonsmokers, linked to roughly 21,000 lung cancer deaths in the U.S. each year.
Wisconsin is not a place to shrug this off. Much of the state — including many southeast Wisconsin counties — is rated by the EPA as a high-risk radon zone, and state health officials estimate that as many as 1 in 10 Wisconsin homes has elevated radon. (Not sure where your home stands? Start with Why You Need a Radon Test in Your Home or 6 Practical Tips to Know If You Should Schedule a Radon Test.)
The Core Idea: Give Radon a Better Exit
Radon enters your home because the air pressure inside is usually slightly lower than the pressure in the soil beneath it — your house literally pulls soil gas in. A mitigation system reverses that relationship.
The standard approach is called sub-slab depressurization, and it’s elegantly simple: a suction point is created beneath your basement slab, a sealed PVC pipe runs from that point up and out of the house, and a continuously running inline fan pulls soil gas out from under the slab and vents it safely above the roofline — where it disperses harmlessly into outdoor air instead of drifting up into your living space.
In other words, the system doesn’t “filter” radon out of your air. It intercepts the gas before it enters your home and gives it a better exit.
What Installation Looks Like
A typical residential installation is a one-day job. A qualified installer will:
- Assess your foundation — slab, sump, crawlspace, or a combination — to pick the right suction point and pipe route.
- Seal major entry points like open sump pits and significant slab cracks, so the system pulls efficiently.
- Drill the suction point through the slab and excavate a small pit beneath it so air can flow.
- Run the pipe and mount the fan, routing through the house or along an exterior wall, venting above the eave line.
- Install a manometer — a simple U-shaped gauge on the pipe that shows at a glance the system is pulling suction.
Done well, the finished system is quiet, unobtrusive, and needs almost nothing from you.
Does It Work?
Yes — this is one of the most proven fixes in home safety. According to the EPA, radon reduction systems can cut indoor radon levels by up to 99%. Most homes that start well above the 4 pCi/L action level end up well below it once a properly designed system is running.
Two follow-ups matter. First, retest after installation to confirm your new level — that’s the proof, not the fan. Second, keep the fan running continuously; radon fans typically last about a decade, and the manometer will tell you if the system ever stops pulling.
Test First, Then Fix
Every mitigation conversation starts with a number, and the number comes from a test. Lifetime Home Services handles both sides — professional radon testing to find out where your home stands, and mitigation systems installed by our local Wisconsin crews when the number calls for it.
Request your free quote or call (262) 955-5701. It’s an invisible problem with a very visible, very fixable solution.
