Radon Testing & Mitigation in Philipsburg, PA
High radon risk from the Centre County Ordovician limestone-dolomite formation transitioning into Appalachian Plateau shale. Philipsburg's position at this geological boundary produces elevated radon concentrations consistent with Centre County's Zone 1 classification.
High Radon Risk Area
Philipsburg sits in EPA Zone 1 — testing is recommended for every home regardless of age or foundation type.
Radon Testing in Philipsburg
In Philipsburg-area ZIP codes, 46% of 857 basement tests reported to PA DEP measured 4.0 pCi/L or higher, with a median of 3.6 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
Philipsburg is located in an area with Appalachian Plateau / Ordovician Limestone Transition 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: $151,700 · Median year built: 1949
- Population: 2,754
- Foundation types: Basement (most common); Stone foundation (older mining-era homes); Crawlspace (rural parcels)
Centre County Context
Philipsburg is a municipality of Centre County, EPA Zone 1. Zone designation is assigned at the county level, so Philipsburg inherits its classification; countywide aggregate figures live on the county page.
See Centre County radon aggregate data →Measured Radon Data for Philipsburg
These figures cover every test whose ZIP code is listed above. ZIP codes do not follow municipal lines, so the figures describe Philipsburg-area ZIP codes, not the municipal boundary of Philipsburg. 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 Philipsburg
Active sub-slab depressurization (ASD) systems in Philipsburg typically cost $1,000–$2,550. 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)
- Stone foundation (older mining-era homes)
- Crawlspace (rural parcels)
Systems used in the region
- Active sub-slab depressurization
- Block wall depressurization
- Multi-zone systems
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 Philipsburg, Centre 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 significant risk in Philipsburg, PA?
Yes. Philipsburg sits at the geological transition between Centre County's Ordovician limestone-dolomite karst and the Appalachian Plateau shale, creating elevated radon concentrations from multiple bedrock sources. 46% of the 857 basement tests reported to PA DEP from Philipsburg-area ZIP codes measured 4.0 pCi/L or higher. Centre County's Zone 1 classification reflects this extreme risk.
Does Philipsburg's mining history affect radon levels?
Yes. Philipsburg's historic coal and clay mining activity disturbed subsurface formations that can accelerate radon migration pathways. Combined with the area's natural carbonate bedrock geology, mining-era land disturbance creates elevated radon entry risk particularly in homes overlying historical mine footprints.
What does radon mitigation cost in Philipsburg?
Philipsburg radon mitigation systems typically cost $1,000–$2,550. Stone and block foundation homes common in the borough require specialized installation. Standard ASD in newer poured concrete construction costs less. Request quotes from DEP-certified Centre County contractors for site-specific pricing.
What share of radon tests in Philipsburg-area ZIP codes are at or above the EPA action level?
46% of the 857 basement tests reported to PA DEP from Philipsburg-area ZIP codes measured 4.0 pCi/L or higher, 9 points above the 37% statewide share. The median result is 3.6 pCi/L. Of 150 first-floor tests, 19% 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 Philipsburg need to be tested for radon?
Centre County is EPA Zone 1 — the highest radon-potential classification — so every home in Philipsburg 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 Philipsburg?
Active sub-slab depressurization (ASD) systems in the Philipsburg area typically cost $1,000–$2,550. 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 Philipsburg?
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 Philipsburg, 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 Philipsburg radon data cover?
The Philipsburg radon dataset on this page covers ZIP code 16866. These are the ZCTAs assigned to Philipsburg 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 Philipsburg's municipal boundary.
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