Radon Testing & Mitigation in York County, PA
Radon in York County: York County is classified EPA Zone 1 — the highest EPA radon-potential classification, indicating predicted average indoor radon above 4.0 pCi/L. 57% of the 81,620 basement tests reported to PA DEP measured 4.0 pCi/L or higher, EPA's action level (median 4.9 pCi/L). Every home should test regardless of zone because individual results vary widely across neighboring properties.
Radon Testing in York County
A test is the only way to learn a specific York County home's radon level. The share of basement tests at or above 4.0 pCi/L, 57% of 81,620 reported to PA DEP, describes the county, not any one house. Short-term tests run 48–96 hours and give a first reading; long-term tests run 90 days or longer and better reflect the annual average.
EPA's action level is 4.0 pCi/L. At or above it, confirm with a follow-up test or move to mitigation, then retest once a system is installed and at least every two years after. Under 25 Pa. Code § 240, anyone testing for radon as a service in Pennsylvania must hold current DEP certification; homeowners may test their own home with a kit from a DEP-certified laboratory. Buying or selling? See radon testing in Pennsylvania real estate transactions.
Radon in York County: The Regional Picture
York County carries a population of 471,240 residents and a countywide median owner-occupied home value of $235,000. The county is classified EPA Zone 1 — the highest EPA radon-potential classification, indicating predicted average indoor radon above 4.0 pCi/L. PA Radon Hub currently maintains dedicated municipal pages for 2 cities and boroughs inside York County.
York County shares county lines with 4 neighboring counties inside Pennsylvania. Radon-producing bedrock does not stop at county boundaries — the geological formations driving elevated indoor radon in York County typically extend into these adjacent counties, and DEP-certified contractors in this region routinely serve multiple counties.
EPA zone classifications are county-wide averages. Individual home results vary substantially inside York County based on bedrock formation, soil permeability, foundation type, and how tightly the building envelope has been sealed against soil-gas infiltration.
Why York County Homes Have Radon Risk
The Census-reported median year built for owner-occupied housing in York County is 1976 — meaning the county carries a late-20th-century housing stock (1970–1990) built to tighter thermal specifications — better insulation and reduced infiltration lift the stack effect during the heating season, drawing more soil gas across the slab.
Radon itself is a colourless radioactive gas produced continuously by the decay of radium-226 in uranium-bearing bedrock. It migrates through soil gas and enters homes through cracks in the slab, cold joints, sump pits, utility penetrations, and block-wall voids. Pennsylvania's combination of fractured bedrock, older housing stock, and pronounced stack effect during the heating season drives elevated indoor radon across most of the Commonwealth — York County included.
EPA Zone 1 tells you the county-wide baseline; the age of the local housing stock tells you why an individual York County home is likely to test elevated even against that baseline. Testing is the only way to know a specific home's number.
Measured Radon Data for York County
Source: PA Department of Environmental Protection, Radon Test Results, data.pa.gov. Tests through July 2026. Retrieved September 29, 2026. Figures count tests, not homes. A home tested more than once is counted each time, and tests run after a mitigation system was installed are included because the dataset does not separate them.
2 DEP-certified mitigation firms are physically based in York County. Firms from adjacent counties routinely serve here as well.
Source: PA DEP Certified Mitigation Firms Directory, July 2026. This reflects business address only — firms based elsewhere may also serve York County.
Cities and Boroughs in York County
Each municipality below has a dedicated PA Radon Hub page carrying local DEP-recorded averages, ZIP coverage, mitigation cost ranges, and DEP-certified contractor connections.
Adjacent Counties
Radon risk does not stop at county lines. The geological formations driving indoor radon in York County typically extend into the neighboring counties below. DEP-certified contractors in the region routinely serve multiple counties.
Comparing radon risk across the wider Commonwealth? Browse All 67 Pennsylvania county radon pages for EPA zone classification and measured basement averages statewide.
Connect with a DEP-Certified Radon Professional
Submit your request and we will connect you with a DEP-certified professional serving York County. All providers verified against the PA Department of Environmental Protection Bureau of Radiation Protection directory.
(717) 461-2427Connect with a DEP-certified radon proPA Radon Hub is an independent informational resource. We do not perform radon testing or mitigation. We connect Pennsylvania property owners with independent, DEP-certified professionals — verify any contractor's certification at dep.pa.gov/radon before hiring.
Testing and Mitigation Options in York County
Short-Term vs. Long-Term Testing
Short-term charcoal canisters and continuous radon monitors run 48–96 hours and cost $15–$50 — the fastest way to get a first reading on a York County home. Long-term alpha-track detectors run 90 days or longer and average the seasonal swing more accurately, which matters in Pennsylvania because heating-season stack effect can push winter readings well above the annual average. If a short-term test returns 4.0 pCi/L or higher, confirm with a follow-up test or move directly to mitigation.
Mitigation Cost Range in York County
Active sub-slab depressurization (ASD) systems in York County typically cost $875–$2,350. Standard basement installations on modern poured-concrete foundations fall at the lower end; historic foundations, block-wall depressurization, multi-point suction, and crawlspace encapsulation push costs toward the upper end. For a full foundation-type breakdown, see the Pennsylvania Radon Mitigation Cost Guide.
Verifying Certification
Under 25 Pa. Code § 240 — the Pennsylvania chapter governing radon certification — every radon testing or mitigation professional working in the Commonwealth must hold current DEP certification. Ask any contractor serving York County for their certification number and verify it directly against the PA DEP Radon Services Directory before signing a contract or accepting payment.
Frequently Asked Questions
What share of radon tests in York County are at or above the EPA action level?
57% of the 81,620 basement tests reported to PA DEP from York County measured 4.0 pCi/L or higher, against 37% statewide. The median result is 4.9 pCi/L, and 15% of tests measured 20 pCi/L or higher.
Do homes in York County need to be tested for radon?
York County is EPA Zone 1 — the highest radon-potential classification — so every home in the county should be tested regardless of age, foundation type, or municipality. Short-term charcoal or continuous monitor tests take 48–96 hours and cost $15–$50; long-term alpha-track tests run 90 days and better represent annual averages. If the result meets or exceeds 4.0 pCi/L, mitigation by a DEP-certified professional is recommended.
How much does radon mitigation cost in York County?
Active sub-slab depressurization (ASD) systems across York County typically cost $875–$2,350. Standard basement installations on modern poured-concrete foundations fall at the lower end; historic foundations, block-wall depressurization, multi-point suction, and crawlspace encapsulation push costs toward the upper end. All work must be performed by a DEP-certified mitigation professional under 25 Pa. Code § 240.
Is radon disclosure required for home sales in York County?
Pennsylvania's Real Estate Seller Disclosure Law (68 Pa.C.S. §§ 7301–7315) requires residential sellers to disclose known material defects to buyers (§ 7303). The state-mandated disclosure form covers 'presence of hazardous substances' at § 7304(b)(14) — where any known elevated radon test result or existing mitigation system is recorded. Sellers who have never tested are not required to test: § 7308 imposes no affirmative duty to investigate. In York County, the practical reality is that most buyers request radon testing during the inspection contingency period. Sellers who test and mitigate before listing eliminate the most common contract contingency and preserve negotiating position.
Which cities in York County have PA Radon Hub coverage?
PA Radon Hub currently maintains dedicated radon pages for 2 municipalities in York County: Hanover and York. Each city page carries local DEP-recorded averages where available, ZIP coverage, mitigation cost ranges, and DEP-certified contractor connections for that municipality.
Related Reading
Independent resource — we do not perform testing. PA Radon Hub is an independent informational resource connecting Pennsylvania property owners with independent, DEP-certified radon professionals. We do not perform radon testing or mitigation. Verify contractor certification against the PA DEP Radon Services Directory before hiring.