Home / Radon Mitigation
Tested at 4.0 pCi/L or higher? A sub-slab depressurization system — installed in one day by a PA DEP-certified professional — typically cuts indoor radon by 80–99%. Every install verified with a follow-up test.
Sub-slab depressurization, the standard fix
Radon enters your home because the air pressure inside is slightly lower than the pressure in the soil beneath it — your house literally inhales soil gas through cracks, joints, and sump openings. A mitigation system reverses that relationship. A suction point is sealed into the slab, a PVC pipe carries soil gas up and out, and a quiet inline fan runs continuously, keeping the soil under your foundation at lower pressure than your basement. Radon gets pulled out and vented above the roofline before it can enter your living space.
It's not a filter and not a one-time treatment — it's a permanent change to how air moves through your foundation, which is why reductions of 80–99% hold for as long as the fan runs.
If your radon test came back higher in January than your neighbor's did in July, that's not a fluke — it's physics, and Erie is close to a worst-case scenario for it. Radon levels in the same house routinely run highest in winter, for two reasons that our climate amplifies.
The first is the stack effect. When you heat your home, warm air rises and leaks out through the upper floors — and that escaping air has to be replaced from somewhere. Some of it gets pulled up from the soil beneath your foundation, through slab cracks, joints, and sump openings. The colder it is outside, the stronger this chimney-like draw becomes, and Erie winters keep it running for months at a time.
The second is the closed-house season. From November through March, windows stay shut, doors open briefly, and whatever soil gas enters the house stays there. Add snow cover, which can seal the ground surface and push more soil gas toward the one escape route that stays open — the warm hole in the ground your house sits on — and winter readings can come in well above the same home's summer numbers.
Two practical takeaways: a winter test is the most honest look at your home's radon problem, and a mitigation system matters most during exactly the months your family spends the most time indoors.
Erie County's homes span more than a century of construction styles, and each one interacts with radon a little differently. Much of the city's older housing sits on stone or block foundations with unfinished basements — charming, but full of entry points: mortar joints, floor-wall gaps, and the porous block itself. Mid-century homes across Millcreek and the townships typically have poured slabs in better condition, but almost all of them include a sump pit, which is effectively an open window to the soil unless it's sealed. And newer construction, while tighter, can actually trap radon more efficiently once it gets in, precisely because modern homes exchange so little air.
Beneath all of them is the same ground: the glacial soils left behind across this part of Pennsylvania are permeable enough to let soil gas move freely toward your foundation. That's part of why more than a quarter of tested Erie County homes have measured at or above the EPA action level — it's not one unlucky neighborhood, it's the geology.
The good news is that none of these foundation types is a hard problem. Stone foundations, sump pits, crawl spaces, and multi-section slabs all have established mitigation approaches — a sealed sump lid here, a sub-membrane system there, sometimes a second suction point. What matters is that the system is designed for your foundation, not a one-size template — which is exactly what the on-site assessment before installation is for.
Mitigation in Erie typically runs $800–$2,000, and most homes with a standard basement land in the $1,000–$1,500 range. The main price drivers are your foundation type, how accessible the slab is, and how high the starting radon level is.
| Home type | Typical price | Approach |
|---|---|---|
| Standard basement, single slab | $1,000 – $1,500 | Sub-slab depressurization |
| Basement + crawl space | $1,400 – $2,000 | Combined sub-slab + sub-membrane |
| Crawl space only | $1,200 – $1,800 | Sub-membrane depressurization |
| Slab-on-grade | $800 – $1,500 | Sub-slab depressurization |
Every quote is free, and every installation includes a post-install verification test. Very high starting levels or multiple foundation sections can require a second suction point.
The point of mitigation isn't the hardware on your wall — it's the number on the retest. That's why every system we install in Erie County is verified with a post-installation radon test, at no extra charge, before the job is considered done.
And because the system includes a manometer gauge, you can confirm it's working every time you walk past it — no annual service contract required. The fan typically lasts about 10 years; when it eventually wears out, replacement is straightforward.
In Erie County, this is the most common way people discover they need mitigation: they're selling a home, the buyer's inspection includes a 48-hour radon test, and the number comes back at or above 4.0 pCi/L. If that's you, the first thing to know is that this does not blow up your deal — radon results are one of the most routinely resolved inspection findings there is.
Here's how it usually plays out. The buyer requests mitigation as part of the inspection negotiation, and in most transactions the seller either pays for the system or credits its cost at closing — at $1,000–$1,500 for a typical home, it's one of the cheaper repairs a sale can surface. Because installation takes a single visit of 3–5 hours and the verification test follows two days later, the entire fix fits inside a standard contingency window without moving your closing date.
There's a silver lining for both sides, too. For the buyer, the home they're purchasing now has lower radon than most of the houses on the street that have never been tested. For the seller, a documented mitigation system with a passing verification test turns a disclosure liability into a selling point — Pennsylvania requires sellers to disclose known radon results, and "tested high, fixed, verified below 4.0" reads far better on a disclosure form than a bare high number.
If you're mid-transaction with a deadline, say so when you call — quotes and scheduling move fastest for closings.
A sub-slab depressurization system draws radon-laden soil gas from beneath your foundation through a sealed suction point and PVC pipe, then a continuously running inline fan vents it above the roofline where it disperses harmlessly. By keeping the soil under the slab at lower pressure than your basement, radon is pulled out before it can enter the home.
Most Erie County homes are done in a single visit of 3 to 5 hours. A verification test runs 2 days after installation to confirm the new radon level.
No. Radon fans run at roughly the volume of a quiet refrigerator hum, and most draw 20 to 90 watts — a few dollars a month in electricity. Fans typically last about 10 years and are straightforward to replace.
Yes. Crawl spaces are treated with sub-membrane depressurization: a heavy plastic membrane is sealed over the exposed soil and the fan draws soil gas from beneath it. Homes with both a basement and a crawl space often combine the two methods in one system.
As long as the fan is running, levels stay down — the system works continuously, not as a one-time treatment. Every system includes a manometer gauge so you can see at a glance that it is operating, and retesting every couple of years is recommended.
Tell us about your home — foundation type and your test result if you have one — and we'll call back with a quote, usually within one business day.