PA DEP certificationMitigation #1966 · Testing #1965
Radon Mitigation Companies in York, PA
Tested your home and got a radon reading you don’t like? Or just trying to work out who to call? Every company here holds a PA DEP radon certification, for mitigation or testing, and works in York County or very close by. We check each one by hand, one at a time, against PA DEP’s certification list, the Attorney General’s contractor search, BBB and their website, and every listing shows when we last checked it. Nobody pays to be listed or to be higher up. Compare them, then call the one you like.
Only PA DEP-certified companies are listed.
Before a company goes on our list, we check that it:
Holds a current PA DEP certification for radon mitigation or testing
Serves York County, or is based nearby
Is on DEP's list itself, not a referral or lead site
35 companies listedHow we check companies
What Your Radon Test Result Means
Your result is a number in picocuries per liter (pCi/L) that shows how much radon is in the air in your home. EPA says fix it at 4.0 or higher, and consider fixing it between 2.0 and 4.0.
Under 2.0Below EPA's levelsBelow the level where EPA suggests considering a fix.
2.0 to 3.9Consider fixingEPA says to consider fixing your home in this range.
4.0 and overFix itEPA says to fix your home at this level. A certified mitigation company does the work.
How Radon Mitigation Works in York, PA
The most common system pulls radon from under your house before it can get inside, and lets it out above your roof. It's done with a pipe and a small fan.
A Small Hole in the Floor
A certified company makes a small hole in your basement floor, down to the soil and gravel underneath.
A Pipe to Above the Roof
A pipe is sealed into the hole and runs up the inside or outside of your house.
A Radon Fan
A fan on the pipe pulls radon out from under the floor. It runs all the time.
Radon Goes Into the Open Air
The radon leaves the pipe above your roof, where it spreads out into the air.
Source: US EPA: Consumer's Guide to Radon Reduction · More on how radon is removed
Radon Testing After Mitigation: What Pennsylvania Law Requires
In Pennsylvania, the company that installs a radon system must make sure your home is tested afterwards. PA DEP says the test must be done within 30 days of the install, but no sooner than 24 hours after the system is running, and the rules say it must last at least 48 hours. DEP also recommends an independent follow-up test, by an independent tester or by you, so there's no conflict of interest. Read the rule (25 Pa. Code § 240.303)
1
System Goes In
The company fits the pipe and fan and switches the system on.
2
Test Within 30 Days
No sooner than 24 hours after the system is on. Your installer arranges the test, or you book an independent certified tester.
3
Check Your Result
Compare your number with EPA's levels above. If it's still 4.0 or higher, talk to your installer.
How to Choose a Radon Mitigation Company in York, PA
Check their PA DEP certification, whether they've worked on homes like yours, their reviews, their guarantee and warranty, how they handle the test after the install, and where they'll put the pipe and fan. Not every company does the job the same way, so it's worth comparing a few.
1
PA DEP Certification
Make sure they're certified by the state for mitigation, not only testing. Every listing shows each certification and its number.
2
Experience With Homes Like Yours
Ask if they've worked on homes like yours: your foundation (basement, slab, crawlspace or a mix), a finished basement, or a private well.
3
Reviews
Read what other customers say about the work and how the company treated them. Listings show Google reviews where there are any.
4
Guarantee and Warranty
Ask what result they promise and how long the system and fan are covered.
5
Retest After Install
Pennsylvania rules say the home is tested after mitigation. Ask if it's included in the price, or book an independent tester yourself.
6
Where the Pipe and Fan Go
Ask if the pipe runs inside or outside, and where the fan will sit.
Every Certified Company Serving York County
35 PA DEP-certified companies serve York County or are based next to it: 13 install radon systems and 22 only test.
Filtered by
Showing 1 to 10 of 35, A to Z. Ratings load live from Google. Listings last checked Oct 2026.
PA DEP certificationMitigation #1418
Also offers: radon-resistant new constructionPA DEP certificationMitigation #3541
PA DEP certificationTesting #2858
PA DEP certificationTesting #2337
PA DEP certificationTesting #3493
PA DEP certificationTesting #3623
PA DEP certificationTesting #3532
PA DEP certificationTesting #3599
PA DEP certificationMitigation #1725 · Testing #1725
Also offers: crawlspace sub-membrane depressurization, radon-resistant new construction and 3 morePA DEP certificationTesting #1631
Also offers: continuous monitor testingPA DEP certificationTesting #3674
PA DEP certificationTesting #3267
PA DEP certificationMitigation #3748 · Testing #3747
PA DEP certificationTesting #3361
PA DEP certificationMitigation #2760 · Testing #2760
Also offers: continuous monitor testing, post-mitigation re-testingPA DEP certificationTesting #2282
PA DEP certificationTesting #3526
PA DEP certificationTesting #2795
PA DEP certificationTesting #2102
PA DEP certificationMitigation #2691
Also offers: post-mitigation re-testingPA DEP certificationTesting #3445
Also offers: well waterPA DEP certificationMitigation #3355 · Testing #3105
Also offers: sub-slab depressurizationPA DEP certificationMitigation #0275 · Testing #0275
Also offers: continuous monitor testingPA DEP certificationMitigation #0565
Also offers: radon system repairPA DEP certificationMitigation #1800 · Testing #1800
Also offers: post-mitigation re-testingPA DEP certificationTesting #3736
PA DEP certificationTesting #3013
Also offers: continuous monitor testingPA DEP certificationMitigation #2735 · Testing #2735
PA DEP certificationMitigation #3287 · Testing #3287
PA DEP certificationTesting #3283
PA DEP certificationTesting #2996
PA DEP certificationTesting #3760
PA DEP certificationTesting #3608
PA DEP certificationTesting #3743
Certified lists read October 2, 2026. See PA DEP's own directory.
Radon Mitigation Near Me in York County, PA
York9.9 pCi/L averageYork Township13.2 pCi/L averageSpringettsbury12.2 pCi/L averageManchester7.0 pCi/L averageDover7.4 pCi/L averageRed Lion16.3 pCi/L averageDallastown16.7 pCi/L averageHanover11.0 pCi/L averageShrewsbury9.0 pCi/L averageGlen Rock17.4 pCi/L averageSpring Grove21.0 pCi/L averageWrightsville23.0 pCi/L averageHellam15.2 pCi/L averageStewartstown15.1 pCi/L averageNew Freedom9.4 pCi/L averageDelta11.6 pCi/L averageWindsor17.9 pCi/L averageJacobus16.8 pCi/L average
Radon Guides for York County, PA
Start with where you are: you haven't tested yet, your radon number came back high, you're buying, selling or building, or you already have a radon system. Each guide answers one question in plain words, with links to the official sources.
I haven't tested yet
Why radon runs high in York County
What DEP's test results show for York County, and what affects radon in a home.
Is radon dangerous?
What radon does to your health, and who is most at risk.
How to test your home for radon
Where to put the kit, how long to leave it, and when to call a certified company.
Is there radon in your well water?
How radon gets into your water, how to test it and how it's fixed.
My radon number is high
What your radon number means
What counts as high, what's worth fixing, and what to do next.
How radon is reduced in a house
What goes into your home, how it pulls radon out, and what it involves.
What radon mitigation costs in PA
What affects your price, and what to ask for when you get a quote.
Choosing a radon mitigation company
How to check their PA DEP certification, what a written quote should include, and how to compare two side by side.
I'm buying, selling, renting or building
Radon in a Pennsylvania home sale
What to expect when you're buying or selling, and what you can do if the result is high.
Radon when you rent
How to test a rented home, and what to ask your landlord.
Building a new home to resist radon
What to ask your builder, and why you still test after you move in.
I already have a radon system
Is my radon system working?
What the gauge on the pipe tells you, what to do if the fan stops, and when to test again.
Can you finish a basement with a radon system?
What to check before you frame, and when to retest after.
Builder's radon pipe: do you need to add a fan?
If your system is a capped pipe with no fan, here's what that means.
Radon FAQs for York County, PA
Do I need a radon test in York County?
Yes. EPA puts all of York County in Zone 1, its highest radon potential. EPA also says all homes should be tested whatever the zone, because the only way to know your level is to test. A DIY kit or a certified tester gives you a number.
How much does radon mitigation cost in York, PA?
PA DEP says permanent radon systems typically cost between $800 and $1,200. Its consumer's guide gives a wider range of $500 to $2,000, depending on the size and design of your home.
What does a radon system cost to run?
PA DEP says annual operating costs may be from $30 to over $100, depending on fan size and other things about the install.
Do you need a radon test when selling a house in PA?
PA DEP says that if your home has been tested for radon, the results must be disclosed when it is sold. It also says buyers often ask whether a home has been tested, and whether high levels were reduced.
What happens after a radon system is installed?
PA DEP says the home must be tested within 30 days of the install, but no sooner than 24 hours after the system is running. The installer must make sure it's done, and DEP recommends an independent follow-up test too.
Can I fix radon myself?
Yes, as far as certification goes. PA DEP's Citizen's Guide says Pennsylvania law exempts a homeowner or occupant lowering radon in their own home from certification. Test again after the work. Our guide to how radon is reduced in a house explains why DEP still recommends a certified company.
How do I check a radon company is certified?
Every listing shows its PA DEP certification number. You can also check PA DEP's own Radon Services Directory, which DEP updates each month.
Sources: US EPA: Pennsylvania Map of Radon Zones; PA DEP: National Radon Action Month release; PA DEP fact sheet: Radon Mitigation Systems (2940-FS-DEP4430); PA DEP: Pennsylvania Citizen's Guide to Radon (2900-BK-DEP0375); PA DEP: Pennsylvania Consumer's Guide to Radon Reduction; PA DEP Radon Services Directory