Radon Testing & Mitigation in York, PA
Moderate radon risk across York County's diverse Piedmont geology — a south-central carbonate belt of limestone and dolomite anchoring the central plain, the Peach Bottom Formation slate belt in extreme southeast York County, and Triassic red shale toward the northern Gettysburg basin edge. Folded Appalachian structures and Susquehanna River corridors create variable radon entry pathways across the county.
High Radon Risk Area
York sits in EPA Zone 1 — testing is recommended for every home regardless of age or foundation type.
Radon Testing in York
In York-area ZIP codes, 57% of 13,717 basement tests reported to PA DEP measured 4.0 pCi/L or higher, with a median of 4.8 pCi/L. Readings differ from house to house, so each home needs its own test. Start with a short-term test of 48–96 hours on the lowest lived-in level. A long-term test of 90 days or more averages out seasonal swings.
A result at or above EPA's 4.0 pCi/L action level calls for a confirming test or mitigation. Retest after a mitigation system goes in, and at least every two years from then on. Pennsylvania requires DEP certification for anyone who tests as a paid service; you may test your own home with a kit from a DEP-certified laboratory. For a home sale, read the Pennsylvania real estate radon testing guide.
Local Geology & Risk Factors
York is located in an area with Piedmont Carbonate Belt / Peach Bottom Slate geology, which contributes to elevated radon levels. The Pennsylvania DEP identifies this region as having significant radon potential due to uranium-bearing rock formations.
Testing is essential because radon levels can vary significantly between neighboring homes based on construction, soil permeability, and ventilation.
See Pennsylvania radon levels and EPA radon zone classifications →
Quick Facts
- Median home value: $103,100 · Median year built: 1941
- Population: 44,830
- Foundation types: Basement (most common in York's dense housing stock); Stone foundation (historic district homes); Slab-on-grade (newer suburban developments)
York County Context
York is a municipality of York County, EPA Zone 1. Zone designation is assigned at the county level, so York inherits its classification; countywide aggregate figures live on the county page.
See York County radon aggregate data →Measured Radon Data for York
These figures cover every test whose ZIP code is listed above. ZIP codes do not follow municipal lines, so the figures describe York-area ZIP codes, not the municipal boundary of York. They count tests, not homes.
Source: PA Department of Environmental Protection, Radon Test Results, data.pa.gov. Tests through July 2026. Retrieved September 29, 2026.
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Radon Mitigation Cost in York
Active sub-slab depressurization (ASD) systems in York typically cost $875–$2,200. Standard basement installs on modern poured concrete fall at the lower end; historic foundations, block-wall depressurization, multi-point suction, and crawlspace encapsulation push costs higher.
Foundations covered locally
- Basement (most common in York's dense housing stock)
- Stone foundation (historic district homes)
- Slab-on-grade (newer suburban developments)
Systems used in the region
- Active sub-slab depressurization
- Sump pit depressurization
- Crawlspace encapsulation
Certification & Compliance
All Pennsylvania radon testing and mitigation professionals must hold active PA DEP certification. Ask any contractor for their certification number and verify it before signing.
Pennsylvania's Real Estate Seller Disclosure Law (68 Pa.C.S. §§ 7301–7315) requires sellers to disclose known material defects to buyers under § 7303; the mandated disclosure form records radon under § 7304(b)(14). Sellers who have never tested are not compelled to test — § 7308 imposes no affirmative duty to investigate — but pre-listing testing is standard practice across most PA markets.
Under 25 Pa. Code § 240 — the Pennsylvania chapter governing radon certification — every radon service provider working in the Commonwealth must hold current DEP certification. Verify the contractor's status via the DEP Radon Services Directory before hiring.
Verify Contractor Certification — PA DEP Official Directory for York, York County
View PA DEP Certified Contractor DirectoryThe PA Department of Environmental Protection maintains the official list of certified radon testers and mitigators, sorted by county and updated monthly. Always verify certification before hiring any contractor.
Directory resource provided by PA DEP Bureau of Radiation Protection, Radon Division.
Frequently Asked Questions
Is radon a concern in York, PA?
Yes. York sits in a Piedmont carbonate belt — limestone and dolomite beneath the central plain — with the Peach Bottom Formation slate belt to the southeast and Triassic red shale toward the northern Gettysburg basin edge. York County's EPA Zone 1 classification places it in Pennsylvania's highest radon potential tier, and 57% of the 13,717 basement tests reported to PA DEP from York-area ZIP codes measured 4.0 pCi/L or higher. Homes in the southeast carbonate-slate zone typically test higher than those in the Triassic areas to the north.
Do southern York County homes near the Peach Bottom slate belt have higher radon risk?
Yes. Southeastern York County's Peach Bottom Formation slate belt is a hard, dense, fractured bedrock — those fracture pathways open routes for soil gas to enter overlying homes along the Susquehanna River corridor near the Maryland border. DEP radon mapping confirms elevated exceedance rates in these southern townships.
What does radon mitigation cost in York, PA?
York area radon mitigation systems typically cost $875–$2,200. Historic stone foundation homes in the York Historic District cost more to mitigate. Standard poured concrete basement ASD installations fall at the lower end. Request quotes from DEP-certified York County contractors for site-specific pricing.
What share of radon tests in York-area ZIP codes are at or above the EPA action level?
57% of the 13,717 basement tests reported to PA DEP from York-area ZIP codes measured 4.0 pCi/L or higher, 20 points above the 37% statewide share. The median result is 4.8 pCi/L. Of 2,290 first-floor tests, 33% measured 4.0 pCi/L or higher. The figures cover the ZIP codes listed on this page, not the municipal boundary, and they count tests, not homes.
Do homes in York need to be tested for radon?
York County is EPA Zone 1 — the highest radon-potential classification — so every home in York should be tested regardless of age, foundation type, or neighborhood. 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?
Active sub-slab depressurization (ASD) systems in the York area typically cost $875–$2,200. 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 when selling a home in York?
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, 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 ZIP codes does the York radon data cover?
The York radon dataset on this page covers ZIP codes 17401, 17403, and 17404. These are the ZCTAs assigned to York in the Census 2020 ZCTA-to-Place relationship file, and the page counts every test in the PA DEP record on data.pa.gov that carries one of them. A ZIP code can reach into a neighboring municipality, so the figures describe these ZIP codes rather than York's municipal boundary.
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