Radon Mitigation in York, PA: 2026 Costs and Local Test Data
Updated
A standard radon mitigation system in York costs $800 to $1,500, up to $2,500 for a larger home or a harder foundation, and a crawlspace system runs $1,500 to $3,000 or more. PA DEP has 17,149 home radon tests on record from York City's ZIP codes, and 51.9% came back at or above the EPA's 4 pCi/L action level. County-wide it is 52.5% of 98,845 tests.
What a radon system costs here, what the state's test records show for York, and how to check an installer before you hire one.
What the PA DEP test records show for York
The Pennsylvania DEP keeps every certified radon test result by ZIP code. These are the three ZIP codes that cover York City, against the county as a whole. ZIP codes don't follow city lines, so they also take in some homes just outside the city.
| ZIP | Tests | Median pCi/L | 4+ pCi/L | 10+ | 20+ |
|---|---|---|---|---|---|
| 17403 | 8,348 | 4.7 | 55.2% | 29.6% | 15.2% |
| 17404 | 8,196 | 4 | 50.7% | 20.2% | 6.1% |
| 17401 (downtown) | 605 | 1.8 | 22.1% | 3.6% | 0.5% |
| York County | 98,845 | 4.3 | 52.5% | 26.8% | 13.1% |
About one test in two in York comes back high. Downtown 17401 is the exception at 22.1%, while 17403 runs above the county rate at 55.2%. The tail matters as much as the median: 24.2% of tests in these ZIP codes were 10 pCi/L or higher, 10.3% were 20 or higher, and the top reading on record is 534 pCi/L.
Basements read higher than the floors above. In 17403 the basement median is 5.3 pCi/L against 2.8 on the first floor; in 17404 it is 4.6 against 1.7. DEP and EPA guidance is to test the lowest level you use or could use as living space.
Neighboring houses can differ by a factor of ten, so none of this tells you what your house is. It tells you the odds are high enough that a $15 to $30 test kit is worth buying. Town-by-town numbers are on York County radon levels and on each town page, such as York Township and West York.
Source: PA DEP radon test results (data.pa.gov), 98,845 York County tests. These are tests people chose to run, not a random survey.
Every radon service in York County, and what it actually costs
"Radon mitigation" covers more than one job. Which one a house needs depends on its foundation, whether it is on a transaction clock, and whether radon is coming through the soil or through a private well. Here is every service, with the typical York County price range for each and where to read the full detail.
| Service | Typical York County range |
|---|---|
| Radon testing (professional) | $150 – $700 |
| Standard sub-slab depressurization | $800 – $1,500 (up to $2,500+) |
| Crawlspace sub-membrane mitigation | $1,500 – $3,000+ |
| Radon fan replacement | $300 – $700 |
| Radon-resistant new construction (fan activation) | $350 – $1,200 |
| Passive-to-active system activation | $350 – $1,200 |
| Real estate transaction mitigation | $800 – $2,500 |
| Radon in well water treatment | Quoted separately after a water test |
Ranges reflect the same source data as the full cost page: 2026 Angi and HomeGuide national cost data plus how each method compares locally in materials and labor. An actual price needs a site visit.
Radon testing
Before any system goes in, a test confirms there is actually a problem, and after installation a second test confirms it worked. A DIY charcoal-canister short-term kit runs $15 to $30 and gives a usable first number in two to seven days; it is a legitimate, EPA-recognized method. A professional test, usually continuous radon monitoring equipment, runs $150 to $700 and is the standard for real estate transactions because it produces real-time, tamper-resistant data instead of a single averaged reading. See radon testing for how a test is actually run.
Sub-slab depressurization (the standard system)
The fix for most York County homes: a hole cored through the basement slab, a PVC pipe routed to above the roofline, and an inline fan that runs continuously, holding the space under the foundation at lower pressure than the house. For a straightforward poured slab on gravel, installation is usually a single day. Typically $800 to $1,500, climbing toward $2,500 for a larger home, a second suction point, or a harder foundation to seal. See sub-slab depressurization.
Crawlspace radon mitigation
A dirt-floor crawlspace cannot be cored like a slab, so the fix is sub-membrane depressurization: a heavy polyethylene membrane sealed over the entire crawlspace floor and up the foundation walls, with suction pulled from beneath it. It is more material and more labor in a cramped space, which is why it typically costs more than a slab system: $1,500 to $3,000 or more, depending on the crawlspace's size and how it connects to the rest of the foundation. See crawlspace radon.
Radon fan replacement and service
A radon fan is a wear item, typically rated for five to ten years of continuous running. Replacement on an existing system is usually straightforward because the pipe, route and roof penetration are already in place; the job is matching a new fan to the system's original pressure and flow curve, then retesting to confirm the result still holds. Typically $300 to $700 including the retest. See fans and maintenance.
New construction: radon-resistant building
Pennsylvania does not mandate radon-resistant new construction, but it is inexpensive to build in: a gravel or matting layer under the slab, a sealed vapor barrier, and a vent pipe run from beneath the foundation up through the roof before the walls go up, relying on passive stack-effect airflow with no fan. It is not guaranteed to hold a new home below 4 pCi/L on its own. If a test after move-in comes back elevated, adding a fan to that existing pipe is one of the cheapest mitigation jobs available, typically $350 to $1,200, because the pipe routing and roof penetration are already done. See new construction.
Passive-to-active system activation
Some newer York County homes already have a passive radon system, rough-in pipe and membrane, no fan, installed during construction. If a test shows the passive system alone is not holding the house below 4 pCi/L, activating it by adding an inline fan is typically the cheapest mitigation retrofit available: $350 to $1,200, the same range as adding a fan to any existing rough-in. See passive vs active systems for how to tell which one a house has.
Radon and real estate transactions
Radon shows up in a large share of York County home sales, usually during the ten-to-fifteen-day inspection contingency window after an accepted offer. Pennsylvania does not require a pre-sale radon test, but the state's Seller Disclosure Law requires disclosing a result the seller already has, and a result at or above 4 pCi/L typically becomes a negotiated repair or closing credit. The system itself costs the same as any other mitigation, $800 to $2,500 depending on foundation, but on a transaction clock the whole process usually compresses to about two weeks. See radon and home sales.
Radon in well water
Most radon in a house comes through the foundation, but York County has a lot of private wells, and radon dissolved in well water is a real secondary path, released into the air mainly by showers and washing machines. It is a separate test and a separate fix from soil gas: whole-house aeration or a point-of-entry granular activated carbon unit, not a sub-slab system. Because the right size depends on a well's flow rate and the water test result, there is no flat price here; a water-treatment specialist quotes it after testing. See radon in well water for how aeration compares to carbon filtration.
PA law requires certification for this work
Pennsylvania has required state certification for radon work since 1988, under the Radon Certification Act (Act 43 of 1987, 25 Pa. Code Chapter 240). Anyone who tests for or mitigates radon for compensation in Pennsylvania must hold an active PA DEP certification, which covers radon physics, measurement protocol, system design and installation standards. Verify anyone you are considering in the DEP's public certification database before you sign anything. The only exemption is testing or fixing radon in a building you personally own and occupy.
This is unusual. Most states have no radon licensing at all. It means that in Pennsylvania a quote from an uncertified installer is not a bargain, it is an illegal transaction, and it will not stand up in a real estate negotiation where the buyer's agent asks for the certification number. What a homeowner may legally do in their own house is a separate question, covered on can I install it myself.
What to ask before you hire anyone
- Their PA DEP certification number, and confirmation you can look it up yourself
- Whether the quote includes a post-mitigation test, and who pays if the result is still above 4 pCi/L
- Where the suction point will go and where the pipe will run, agreed before work starts
- Which fan model, its warranty, and what a replacement costs in five years
- Whether the system will be interior or exterior, and what it will look like from the street
- Whether a permit is required in your borough or township, and who pulls it
- A written guarantee of the result, stated as a number, not as "we will get it down"
More on the red flags, and what a good quote reads like, on choosing a radon contractor.
Get a Free Radon Mitigation Quote
Share your test result and where you live. We follow up personally with next steps.
Radon mitigation, answered directly
Radon mitigation is the installation of a system, most commonly active sub-slab depressurization, that draws radon gas from beneath a home's foundation and vents it above the roofline before it can enter the living space. It is the standard response when a radon test result is at or above the EPA's action level of 4 pCi/L, and in most York County homes it is a one-day installation.
Radon is a colorless, odorless radioactive gas produced by the decay of uranium in soil and rock. It is harmless outdoors, where it disperses. It becomes a health concern when it enters a building through the foundation and accumulates, because it is the second leading cause of lung cancer in the United States after smoking, according to the EPA. Nothing about a house looks or smells different when radon is high, which is why testing is the only way to know.
The fix is mechanical, not chemical. Nothing is sprayed, sealed off or treated. A pipe is routed from beneath the slab to above the roof, a fan on that pipe holds the space under the foundation at slightly lower pressure than the house, and the gas takes the pipe instead of the cracks. Done properly it runs for years without attention beyond a glance at a gauge. The details are on the sub-slab depressurization page.
Why York County specifically
Radon comes from uranium naturally present in soil and bedrock, so the amount varies with local geology rather than with how new or well-built a house is. Pennsylvania carries some of the highest average indoor radon levels in the country, and the Department of Environmental Protection states plainly that "Pennsylvania has one of the most serious radon problems in the United States."
York County is mapped by the EPA in Radon Zone 1, the highest of three categories, meaning a predicted average indoor screening level greater than 4 pCi/L. That is a county-level prediction, not a statement about any individual property. Radon levels differ between neighbouring houses on the same street, because what matters is the soil directly under that foundation and the way that particular building draws air up from below.
The underlying geology is covered properly on why Pennsylvania is a radon state, including the Reading Prong and the carbonate rock that runs through the county.
What the numbers actually say, and where they disagree
Be careful with the county averages published online. We checked four sources that publish a York County figure and got four different answers, ranging from roughly 9.85 to 13.2 pCi/L. They are not measuring the same thing: some are pulling from a single test-kit vendor's customer results, some mix short-term and long-term tests, and all of them are self-selected, because people who suspect a problem are the ones who test.
The figure we will state, because it comes from the primary source, is the DEP's: approximately 40 percent of homes tested in Pennsylvania have radon levels above 4 pCi/L. The national average indoor level is about 1.3 pCi/L for comparison.
None of it tells you about your house. A county average cannot be applied to a specific address, and a $15 test can. The full breakdown of which source says what, and why they conflict, is on York County radon levels.
What a radon mitigation system costs
Most homes are mitigated with an active soil depressurization system: a fan-powered pipe that draws radon from beneath the slab and vents it above the roof. National cost data from Angi and HomeGuide for 2026 puts a complete system at around $1,000 on average, with most homeowners paying between $800 and $2,500 depending on the method and the foundation. Budget separately for testing and for any local permit.
| Item | Typical range |
|---|---|
| Radon testing | $150 – $700 |
| Standard sub-slab depressurization system | $800 – $2,000 |
| Larger home or complex foundation | up to $2,500+ |
| Crawlspace sub-membrane system | typically higher, membrane and labour driven |
| Local permit | $25 – $150 |
| Fan replacement, later | a few hundred, every 5 to 10 years |
Sources: Angi and HomeGuide, 2026 cost data. A quote for a specific home depends on foundation type, suction point access and pipe routing. The full cost guide breaks down what moves the number.
Your test came back at a number. Here is what that means.
The EPA's action level is 4 pCi/L, but it is a threshold for acting, not a cliff edge where a house becomes dangerous. Risk rises with concentration and with how long you are exposed.
| Result | What DEP and EPA guidance points to |
|---|---|
| Below 2 pCi/L | At or near typical indoor levels. Retest every few years and after major structural or HVAC changes. |
| 2 to 4 pCi/L | Below the action level. The EPA notes reduction can still be considered in this band. Worth a long-term test to see the annual average. |
| 4 to 8 pCi/L | DEP's guidance: confirm with a second test, either a long-term 365-day test for the true annual average or another short-term 2 to 7 day test, then mitigate. |
| 8 to 20 pCi/L | Confirm with a short-term test rather than waiting a year, and mitigate. Waiting twelve months at this level is not the right trade. |
| Above 20 pCi/L | Treat as urgent. Confirm quickly and mitigate promptly. |
The longer version, including what to do if two tests in the same house disagree, is on your result came back high.
Short-term test or long-term test
A short-term test runs 2 to 7 days and gives you an answer this week. A long-term test runs up to 365 days and gives you the annual average, which is the number that actually corresponds to your exposure, because radon swings with season, weather and whether the windows are open. Short-term results run high in winter and during storms.
Use a short-term test when you need a decision fast, which usually means a house sale. Use a long-term test when you are deciding whether a borderline result is real. Both are covered on short-term vs long-term tests, along with the conditions that invalidate a result entirely.
Radon questions from York County homeowners
How much does radon mitigation cost in York, PA?
A standard sub-slab system in York County typically runs $800 to $1,500. Larger homes or extra suction points push it toward $2,500, and crawlspace membrane systems usually run $1,500 to $3,000. The full breakdown is on the cost page.
How many York County homes test high for radon?
Of 98,845 home radon tests PA DEP has on record for York County, 52.5% came back at or above the EPA's 4.0 pCi/L action level, and the median was 4.3 pCi/L. The service area page breaks that down by township and borough.
Does a radon installer need to be certified in Pennsylvania?
Yes. Pennsylvania requires anyone who tests for or mitigates radon to hold a PA DEP certification, and you can check any name on the DEP's public list.
How long does a radon system take to install?
Most York County installs are done in a single day. Crawlspace membrane work or a second suction point can add time.
Do I need to test again after a system goes in?
Yes. Test after the system has run for at least a day to confirm it worked, then retest every couple of years or after any major renovation to the lower level.
Does homeowners insurance cover radon mitigation?
No, in almost all cases. A standard homeowners policy treats radon as a known, ongoing environmental condition rather than sudden accidental damage, so it does not cover testing or mitigation. Be cautious of any contractor who offers to handle an insurance claim for you.
Is a radon level of 1.3 pCi/L considered high?
No. 1.3 pCi/L is close to the EPA's cited national average indoor level. The EPA's action level, where mitigation is recommended, is 4 pCi/L.
Why is radon so high in Pennsylvania?
Pennsylvania sits over uranium-bearing rock formations, including the Reading Prong and carbonate karst geology that run through York County. See why Pennsylvania is a radon state.
What time of year does radon run highest?
Winter, during the heating season. Closed windows and the stack effect both increase how much soil gas gets drawn into the house, which is also why PA DEP recommends retesting in the basement during the heating season.
Is there a fast way to lower radon while I wait for a system?
Sealing major foundation cracks and increasing ventilation can produce a modest, temporary reduction, but the EPA does not consider it a reliable primary fix. See radon reduction without a full system.
How the standard system works
Active sub-slab depressurization sounds technical and is not. A hole is cored through the basement slab, usually in a corner or a utility area, and a pit is dug out beneath it. A PVC pipe rises from that pit, runs either up through the house or outside along a wall, and terminates above the roofline away from windows. An inline fan on that pipe runs continuously, pulling air from under the slab.
The result is that the space under the foundation sits at slightly lower pressure than the room above it. Radon takes the path of least resistance, which is now the pipe rather than every crack, joint and pipe penetration in the floor. Accessible openings get sealed at the same time, not as the fix but to stop the fan wasting suction on conditioned indoor air.
When the standard system is the wrong system
A poured slab over gravel is the easy case. Plenty of York County housing stock is not that.
- A dirt-floor crawlspace needs sub-membrane depressurization, a sealed membrane over the soil with the suction taken from beneath it. See crawlspace radon
- A house with both a basement and a crawlspace often needs two suction points, sometimes two systems
- Hollow block foundation walls can carry radon inside the wall cavity, which calls for block-wall depressurization
- An existing interior drain tile loop can be used as the suction field, which is often the cheapest good option
- Slab-on-grade with no basement changes where the pipe can realistically go
- A newer home may already have a passive rough-in, in which case activating it is far cheaper than a new install. See passive vs active
All of these are laid out on system types. If you are building rather than fixing, radon-resistant new construction costs a fraction of a retrofit.
After it is installed
A finished system gets a post-mitigation test to prove it worked. That number, not the installer's confidence, is the deliverable. Keep the report: it is what a buyer's agent will ask for.
After that the maintenance is small but real. There is a U-tube manometer on the pipe; the two columns of liquid sit at different heights when the fan is pulling, and level when it is not. Glancing at it occasionally is the whole check. Fans last roughly five to ten years and are replaceable. DEP's guidance is to retest about once every two years, generally in the basement and preferably during the heating season. Details on fans and maintenance.
Radon and selling a house in York County
Radon shows up in a large share of local transactions, and it shows up late, usually during the inspection period with a closing date already set. A result over 4 pCi/L becomes a negotiation. A documented mitigation system with a post-install test below the action level ends the conversation instead of starting it, and it is frequently cheaper than the credit a buyer will ask for.
Pennsylvania's seller disclosure form asks about known radon testing and mitigation, so a result you already have is not something you can set aside. Radon and home sales covers the transaction timeline, who normally pays, and how to handle a test done by the buyer's inspector.
Radon in well water, and who that applies to
Most radon in a house comes through the foundation, but in a county with a lot of private wells, waterborne radon is a real secondary path. It is released into the air when water is agitated, so showers and washing machines are where it shows up. It is a different test and a different fix, aeration or granular activated carbon at the point of entry, not the sub-slab system. See radon in well water.
What about schools?
Pennsylvania does not currently require radon testing in public schools. Two bills would change that, SB 760 in the Senate and HB 289 in the House, and both would apply specifically to older buildings in EPA Zone 1 counties, which includes York. Neither has passed. The current status, and what it would mean locally, is on radon in PA schools.
Got a test result back?
Tell us the number and your town in York County, or just call and read it out. We will tell you what it points to and what a system would involve in a house like yours.
Request a Free Quote Call (717) 356-9995Everything else on this site
Each of these answers one question properly rather than in a paragraph. Start wherever your situation sits.
York County radon levels
Four sources publish four different county averages. What the numbers do and do not tell you.
Why Pennsylvania is a radon state
The Reading Prong, carbonate karst, and why south-central PA reads high.
Radon testing
How a test is run, where the device goes, and what invalidates a result.
Short-term vs long-term tests
Two to seven days, or a full year. Which answer you actually need.
Your result came back high
A decision table by number, from 2 pCi/L to over 20.
Sub-slab depressurization
The standard system, explained properly: suction point, pipe route, fan, vent.
System types
When the standard system is wrong, and what replaces it.
Crawlspace radon
Sub-membrane depressurization, and why a dirt crawlspace changes the design.
Fans and maintenance
Manometer checks, fan life, and DEP's every-two-years retest.
Radon in well water
Waterborne radon, aeration vs carbon, and who it applies to in York County.
Passive vs active systems
The rough-in in a newer house, and what it costs to activate.
New construction
Radon-resistant construction, and why it is cheap before the slab goes down.
Radon and home sales
Testing on a transaction clock, and who pays for the system.
Radon in PA schools
SB 760, HB 289, and what is actually required right now.
Can I install it myself?
What PA law lets a homeowner do in their own house, and where it stops.
What it costs
Ranges by system type, and what moves a quote up.
Radon and health
What the evidence supports, without the scare tactics.
Choosing a contractor
DEP certification lookup, and the red flags worth walking away from.
Our process
Test, design, install, verify.
All guides
The complete index of everything written here.
Service area
Every borough and township covered across York County.
Full FAQ
Timelines, disruption, insurance, resale, and the rest.
About this site
Who runs it, and what it is and is not.
Request a quote
Tell us your test result and your town.
Does sealing cracks work?
Why it rarely gets a house below the action level on its own.
Sump pumps and radon
Often the biggest opening in a basement, and often the best suction point.
After basement waterproofing
Why readings go up, and why that channel is good news for the system.
Finishing a basement?
Test first. It changes your exposure and it changes the cost of fixing it.
Row homes and attached houses
What a shared party wall does to the design, and where the pipe goes.
Fan noise
What is normal, what is not, and how to fix it without switching it off.
Inspecting an existing system
Five checks, and the one piece of paper most systems are missing.
How long it takes
One day to install. Two to three weeks start to verified finish.
Landlords
What PA requires, and why you cannot do this one yourself on a rental.
How the risk actually works
The gas is mostly exhaled. It is the decay products that do the damage.
Granite countertops
The EPA says no. Here is where your radon is actually coming from.
What if I ignore it?
The honest version, including what it does to a sale later.
Serving York and all of York County
York County covers roughly 900 square miles and the geology is not uniform across it, so a neighbour's result is weak evidence about your own house. We cover the whole county. See the full service area for the boroughs and townships.
