York County, Pennsylvania
More than half of every radon test ever recorded in York County came back at or above the action level. Across the rest of Pennsylvania it is a third. This guide shows what your own reading means, what a system actually costs here, and which contractors can install one.
picocuries per liter (pCi/L)
York County averages 10.75 pCi/L, which sits here.
under 2Near the level you would measure outdoors. No action advised.
2 to 4Below the action level, but EPA suggests you consider reducing it.
4 and aboveAt or above the EPA action level. Elevated radon that should be fixed.
Radon levels in York County run well above the rest of Pennsylvania, and the gap is larger than most homeowners here realise. The state keeps every certified test result on the open data portal, and the York County record now holds 98,845 measurements.
| Measured | York County | Pennsylvania |
|---|---|---|
| Tests on record | 98,845 | 3,334,286 |
| Average reading | 10.75 pCi/L | 6.00 pCi/L |
| At or above 4 pCi/L | 52.5% | 33.7% |
| At or above 10 pCi/L | 26.8% | |
| At or above 20 pCi/L | 13.1% |
The single figure worth remembering is that more than half of York County tests land at or above the action level, against a third statewide. One note on that comparison: the DEP information page puts the statewide figure at around 40 percent, while their own published dataset computes to 33.7 percent. We use the dataset, because that is the number you can check yourself.
A county average still hides a great deal. Radon levels inside York County vary by a factor of more than three between municipalities, which is why a county map is a screening tool rather than a diagnosis.
| Municipality | Tests | Average | At or above 4 |
|---|---|---|---|
| Felton | 941 | 21.28 | 65.1% |
| Windsor | 862 | 17.72 | 66.6% |
| Spring Grove | 2,999 | 17.51 | 58.7% |
| Dallastown | 2,298 | 15.74 | 66.0% |
| York | 35,329 | 9.76 | 52.7% |
| Dover | 3,967 | 6.33 | 44.2% |
| York Haven | 1,035 | 6.19 | 40.6% |
Felton averages 21.28 pCi/L and York Haven 6.19, and both sit inside the same county on the same fractured limestone and shale. Your neighbour's result tells you the geology can produce radon here. It does not tell you what is under your own slab, which is why the reading that counts is the one from your own house.
Radon exposure accumulates over years of breathing the air in the rooms you use most, so the basement you finished into an office matters more than the crawl space you never enter. Levels for all 31 York County municipalities with a meaningful sample are listed on the page covering radon levels by York County municipality.
The firms below all work in York County. Ratings are Google review scores retrieved on 21 September 2026 and will drift over time. We list what each firm actually does, because several of them are home inspectors who test for radon but do not install systems, and that distinction decides who you should call.
The only firm on this list with a York city address rather than a service radius reaching into York. Listed by Google under home inspector and carries the name of the service itself, which suggests mitigation rather than testing is the core of the business.
The largest operator in this list by review volume, describing itself as Pennsylvania's largest radon mitigation company and active since 1988. Runs sub-slab and crawl space systems, water radon testing for well users, and mitigation built into new construction. The scale cuts both ways: more installations behind them, less likelihood that the person quoting is the person installing.
Camp Hill base, roughly 35 minutes from York, and every one of its 97 Google reviews is a five star rating. Reviewers mention radon fan installation and scheduling speed most often. Combines inspection and mitigation under one roof, which is convenient but worth a question: ask who signs off on the post-mitigation test.
Mitigation specialist rather than an inspection firm that also mitigates, serving central Pennsylvania since 1991 within about a 60 mile radius of Harrisburg, which covers York. Reviewers mention sump pit sealing and radon level reduction. If your situation involves a sump pump, this is the kind of firm that deals with it routinely.
Names York explicitly in its service area alongside Hanover, Gettysburg and Dover. Offers online estimates, which is unusual in this trade and useful if you want a number before anyone visits. Broad inspection practice, so radon is one service among many rather than the whole business.
States on its own site that it is certified by the Pennsylvania Department of Environmental Protection for both testing and mitigation. Small review count compared to the others here, which means less to go on rather than anything negative.
York based inspection firm operating since 1993, listing radon testing among its services but not mitigation. Call them for the measurement that tells you whether you have a problem, then one of the mitigation firms above for the system that fixes it.
Red Lion base, ten miles southeast of York. Handles radon and mold surveys for both residential and commercial property, with infrared thermography alongside. Useful if the building is commercial, where the inspection requirements differ from a house.
A mitigation system does not filter the air. It changes the pressure under your house so the gas never gets in, which is why an air purifier is not a substitute and never has been. The standard approach in York County housing is sub-slab depressurization, and the installation takes most crews under a day.
A crawl space needs a different treatment. Instead of drilling a slab there is no slab, so the crew lays a sealed membrane over the soil and draws from underneath it. Homes with both a basement and a crawl space sometimes need two suction points, which is one of the biggest single drivers of what the job costs.
The parts of the system, which types actually get installed in York County, and how far each one cuts radon are set out on the page about how a radon mitigation system works.
Quotes for the same house vary more than people expect, and the variation is rarely about the contractor being greedy. It tracks the building, not the severity of your reading. Houses that tested under 4 pCi/L averaged 1,169 dollars and houses above 30 averaged 1,269, so a frightening number on your report does not translate into a frightening quote. Below are the factors that genuinely move a York County price.
| Factor | Cheaper end | More expensive end |
|---|---|---|
| Foundation | Poured slab with a sump pit already in place | Stone foundation, common in older downtown York homes |
| Suction points | One point serves the whole footprint | Additions or a split level need two or more |
| Pipe routing | Straight out the rim joist and up the exterior | Routed internally to the roofline for appearance |
| Crawl space | None, or already sealed | Exposed soil needing a membrane laid and sealed |
| Existing pipe | A passive pipe is already in place and only needs a fan | Nothing in place, the full system has to be built |
Pennsylvania records the cost of every mitigation system its certified contractors install, which means York County has a public price record rather than a guess. Across the 986 systems installed here between 2024 and 2026, the median came to 1,150 dollars and the spread looks like this.
| Price paid | Share of systems | Running total |
|---|---|---|
| Under 700 dollars | 5.2% | 5.2% |
| 700 to 900 | 15.6% | 20.8% |
| 900 to 1,100 | 19.4% | 40.2% |
| 1,100 to 1,300 | 28.2% | 68.4% |
| 1,300 to 1,600 | 23.2% | 91.6% |
| Above 1,600 | 8.4% | 100% |
Roughly seven systems in ten came in under 1,300 dollars and nine in ten under 1,600. A quote outside that range is not automatically wrong, but it is worth asking what about your house puts it there. What the crew has to build matters far more than your reading does: a standard sub-slab system averaged 1,279 dollars across 834 jobs, while activating a passive pipe that was already in the house averaged 770 across 143.
Prices climbed steadily rather than in one jump. York County averaged 935 dollars in 2019, 1,098 in 2023, 1,207 in 2025 and 1,340 across 2026 so far, so treat any figure older than about 2023 as a low estimate. York is still the cheaper end of the state: Pennsylvania as a whole averaged 1,390 dollars over the same three years. The full breakdown sits on the page about what radon mitigation costs in York County.
Two or three quotes on the same scope remains the way to get a number for your own house, which is what the form on this page is for. Ask each firm to price the post-mitigation test and the fan warranty as separate lines, because that is where otherwise similar quotes tend to diverge.
One running cost that quotes often leave out: the fan runs continuously, so a professional radon installation adds a small permanent amount to your electricity bill, plus the fan itself is a wearing part that eventually needs replacing. Ask what the fan is rated for.
Radon resistant new construction puts the passive half of a system in during the build: a gas permeable layer under the slab, a sheet of polyethylene over it, sealed joints, and a vent pipe running from below the slab to the roof. There is no fan. The pipe works by natural stack effect, and it costs far less to install during construction than to retrofit later.
A house built this way is not guaranteed to be below the action level, and that is the part builders sometimes skim over. Passive systems reduce radon, they do not eliminate it. Test the finished house anyway, and if the number is still elevated, the retrofit is cheap: an electrician adds a fan to the pipe that is already there, and the passive system becomes an active mitigation system.
Across 986 systems installed in York County between 2024 and 2026, the median was 1,150 dollars, seven in ten cost under 1,300 and nine in ten under 1,600. A standard sub-slab system averaged 1,279. Activating an existing passive pipe averaged 770.
Standard homeowners policies treat radon as a maintenance matter rather than sudden damage, so mitigation is usually an out of pocket cost. During a property sale it is more often handled as a negotiated credit between buyer and seller than through any insurer.
Winter readings tend to run higher. Closed windows and a heated house create a stack effect that pulls harder on the soil underneath. A short term test taken in January can read above one taken in July in the same house, which is why long term tests give the more representative picture.
An air purifier cannot solve a radon problem. Mitigation works by changing the pressure beneath the slab so the gas never enters, while a purifier only treats air that is already in the room and does nothing about the source under the floor.
Pennsylvania DEP runs a certification program covering radon testing, mitigation and laboratory analysis, for individuals and firms alike. Ask for the certification number and check it in the DEP Radon Services Directory before work starts.
Most single family installations are finished within a day. The longer part is what comes after: the system needs time to draw down before a post-mitigation test can confirm the level actually dropped, so allow a few days before the result is final.
