How long does a radon mitigation system last?
Updated August 2026
The pipe, seal, and slab connection of a radon mitigation system last 20+ years, but the fan strapped to that pipe is the part that wears out, typically at 5–10 years. It runs every hour of every day, so the motor bearings tire first, and a stalled fan can let radon climb back past the 4.0 pCi/L action level within days. Where the fan lands in that 5-to-10 window comes down to how much condensation rides through the pipe and how cold it gets. A replacement fan is a modest $150–350 part; a whole new system installed runs $800–1,500.
Lifespan by type and situation
| Type or situation | Typical lifespan | Why |
|---|---|---|
| PVC piping and slab seal | 20+ years | Inert plastic; it outlasts nearly every other system in the house |
| Radon fan (blower) | 5–10 years | Runs 24/7; the motor bearings are the first thing to go |
| U-tube manometer gauge | Life of the system | No moving parts; a level reading is the sign the fan quit |
| Fan in a humid or freezing pipe | Nearer 5 years | Condensation and cold shorten motor life |
| System after a fan swap | Another 5–10 years | One $150–350 fan keeps a 20-year system doing its job |
Signs yours is near the end
- The two liquid columns in the manometer have leveled out, meaning the fan stopped pulling
- The fan has gone silent, or is buzzing, grinding, or rattling louder than its normal hum
- A fresh radon test creeps back above the 4.0 pCi/L action level
- The fan housing vibrates hard or feels hot to the touch
- Cracking or a loose joint at a pipe connection or the slab seal
How to add years
The system is close to maintenance-free, but the fan is not. Checking the manometer monthly takes seconds and tells you instantly whether the fan is still pulling, and retesting radon every 2 years confirms the numbers are still safe. Follow the radon system maintenance checklist to keep condensation draining and joints sealed, which is what buys the fan its full 5–10 years. When the fan does quit, swapping the $150–350 part restores a 20-year system; skipping the tests entirely is the real risk, as the cost of skipping radon testing makes plain.
What it costs to replace: plan on Fan $150–350; a full new system $800–1,500 installed. Replacing on your own schedule, before it fails, is almost always cheaper than the emergency version. The home maintenance cost calculator helps you set the money aside before it comes due.
OnOtto tracks your radon fan checks age and service history, and warns you before end of life instead of after the flood.
Track your home's systems, free for 30 daysFrequently asked questions
How do I know if my radon fan has failed?
Look at the manometer, the small U-shaped gauge on the pipe. In a working system the colored liquid sits at two different heights; when the fan quits, the two sides level off. A silent pipe (the fan normally gives a soft, constant hum) or a new grinding and rattling noise is the other tell. Confirm with a fresh radon test, because gas levels climb within days of a fan failure. A dead fan is a repair to make now, not next month.
How often should I test radon after installing a system?
The EPA suggests retesting every 2 years even with a working system, and right away any time you replace the fan or notice the manometer has leveled out. A short-term test kit runs $15–40, or a lab-analyzed kit a bit more, and it confirms the system is still holding radon below the 4.0 pCi/L action level. New fan, new baseline: always retest after a swap so you know the fix actually worked.
Does a radon fan run all the time?
Yes, a radon fan runs 24 hours a day, every day, which is exactly why it wears out at 5–10 years while the rest of the system lasts 20+. The upside is that it sips power, usually $10 to $40 a year in electricity, far less than most people expect. Never switch it off to save energy: radon starts building back within hours, and the whole point of the system is constant suction under the slab.
Can I replace a radon fan myself?
It is doable for a handy owner but easy to get wrong. The replacement fan has to match the pipe diameter and the original suction rating, the joints must be resealed airtight, and the wiring should be on its own switch or circuit. A mismatched or leaky install can quietly let radon climb. A new fan is $150–350 for the part; a pro charges a few hundred more to swap it and retest. Always test afterward to prove it worked.