Radon Testing & Mitigation in Warren, PA
Moderate radon risk from Appalachian Plateau Devonian and Mississippian shale formations. Warren County's Allegheny River valley geology produces consistent moderate-range radon concentrations, particularly in homes on non-alluvial hillside positions.
Moderate Radon Risk Area
Warren sits in EPA Zone 2 — testing is recommended for every home regardless of age or foundation type.
Radon Testing in Warren
In Warren-area ZIP codes, 45% of 2,380 basement tests reported to PA DEP measured 4.0 pCi/L or higher, with a median of 3.5 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
Warren is located in an area with Appalachian Plateau / Allegheny River Corridor 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: $101,600 · Median year built: 1938
- Population: 9,273
- Foundation types: Basement (predominant); Crawlspace (rural properties); Slab-on-grade (newer construction)
Warren County Context
Warren is a municipality of Warren County, EPA Zone 2. Zone designation is assigned at the county level, so Warren inherits its classification; countywide aggregate figures live on the county page.
See Warren County radon aggregate data →Measured Radon Data for Warren
These figures cover every test whose ZIP code is listed above. ZIP codes do not follow municipal lines, so the figures describe Warren-area ZIP codes, not the municipal boundary of Warren. 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.
Ready to move forward? Talk to a DEP-certified pro.
Radon Mitigation Cost in Warren
Active sub-slab depressurization (ASD) systems in Warren typically cost $850–$2,100. 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 (predominant)
- Crawlspace (rural properties)
- Slab-on-grade (newer construction)
Systems used in the region
- Active sub-slab depressurization
- Crawlspace encapsulation
- Sump pit depressurization
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 Warren, Warren 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 Warren, PA?
Yes. Warren sits on Appalachian Plateau Devonian and Mississippian shale formations in the Allegheny River valley. While Zone 2 classification indicates moderate average risk, 45% of the 2,380 basement tests reported to PA DEP from Warren-area ZIP codes measured 4.0 pCi/L or higher. Homes on hillside positions overlying deeper shale typically test higher than those on alluvial river-terrace soils.
Does the winter stack effect increase radon in Warren homes?
Yes, significantly. Warren's cold northwest PA winters create strong negative pressure inside heated homes, drawing radon-laden soil gas upward through foundation gaps. Winter testing frequently records the annual maximum radon concentrations for Warren County homes. DEP recommends closed-house conditions during short-term testing regardless of season.
What does radon mitigation cost in Warren, PA?
Warren area systems typically cost $850–$2,100. Standard basement ASD is the most common approach. Rural Warren County properties with crawlspaces require encapsulation. All three provider slots are currently available — contact us to connect with DEP-certified northwest PA contractors serving the Warren area.
What share of radon tests in Warren-area ZIP codes are at or above the EPA action level?
45% of the 2,380 basement tests reported to PA DEP from Warren-area ZIP codes measured 4.0 pCi/L or higher, 8 points above the 37% statewide share. The median result is 3.5 pCi/L. Of 361 first-floor tests, 22% 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 Warren need to be tested for radon?
Warren County is EPA Zone 2, meaning the county has moderate radon potential and elevated readings are common enough that all Warren homes should be tested. 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 Warren?
Active sub-slab depressurization (ASD) systems in the Warren area typically cost $850–$2,100. 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 Warren?
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 Warren, 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 Warren radon data cover?
The Warren radon dataset on this page covers ZIP code 16365. These are the ZCTAs assigned to Warren 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 Warren's municipal boundary.
Connect with a DEP-Certified Radon Pro in Warren
Submit your request and we will connect you with a DEP-certified professional serving Warren County.
(717) 461-2427Connect with a DEP-certified radon pro