Radon Mitigation in Warren
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.
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
Source: PA DEP RadonZip Tool, January 1990 – December 2025 · Updated 2026-05-20
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, 30.1% of tested Warren-area homes exceed EPA's 4 pCi/L action level. 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's the average radon level in Warren?
Warren's DEP-recorded basement average is 6.68 pCi/L across 1,716 tests. The EPA action level for mitigation is 4.0 pCi/L, so a sizable share of Warren homes exceed the threshold. The highest single result in the local dataset is 178.7 pCi/L.
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 used for the PA DEP RadonZip Tool aggregation. Neighboring ZIP codes belong to adjacent municipalities and appear on their own PA Radon Hub pages.
Are Warren-area public schools subject to SB 760?
Warren County is in EPA Zone 2 and is served by 3 school districts: Warren County School District, Corry Area School District, and Titusville Area School District. Pennsylvania Senate Bill 760, if enacted as drafted, would mandate radon testing in all public school buildings by the 2026–2027 academic year. The bill remains in committee. Buildings in Zone 2 counties like Warren County would be included in the proposed framework. If SB 760 is enacted, mitigation timelines, thresholds, and qualifying buildings would be set by the final bill text and any subsequent DEP implementing regulations. PA Radon Hub tracks this legislation; specific deadlines remain pending.
Connect with a DEP-Certified Radon Pro in Warren
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