Radon Mitigation in Gettysburg
High radon risk from the Gettysburg Basin's Triassic sedimentary rocks and diabase intrusions. Adams County sits on a complex of Triassic shale, siltstone, and diabase sills where uranium is concentrated at contact zones between igneous intrusions and surrounding sedimentary rock. The Gettysburg diabase — a dense, dark rock visible in the battlefield landscape — weathers to produce uranium-enriched soils.
High Radon Risk Area
Gettysburg sits in EPA Zone 1 — testing is recommended for every home regardless of age or foundation type.
Local Geology & Risk Factors
Gettysburg is located in an area with Triassic Diabase Intrusion / Gettysburg Basin Shale 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: $237,000 · Median year built: 1942
- Population: 7,929
- Foundation types: Basement (predominant in borough and suburban homes); Stone foundation (Civil War-era structures); Crawlspace (rural farmhouses)
Adams County Context
Gettysburg is a municipality of Adams County, EPA Zone 1. Zone designation is assigned at the county level, so Gettysburg inherits its classification; countywide aggregate figures live on the county page.
See Adams County radon aggregate data →Measured Radon Data for Gettysburg
This unusually high reading may reflect a source data anomaly or a single-home outlier; individual home results vary widely.
Source: PA DEP RadonZip Tool, January 1990 – December 2025 · Updated 2026-05-20
Radon Mitigation Cost in Gettysburg
Active sub-slab depressurization (ASD) systems in Gettysburg typically cost $900–$2,400. 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 in borough and suburban homes)
- Stone foundation (Civil War-era structures)
- Crawlspace (rural farmhouses)
Systems used in the region
- Active sub-slab depressurization
- Block wall depressurization
- Sub-membrane depressurization (crawlspace)
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 Gettysburg, Adams 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
How does Gettysburg's diabase geology affect radon levels?
The Gettysburg diabase is a Jurassic-age igneous intrusion that penetrated Triassic sedimentary rocks across Adams County. Uranium concentrates at the contact zones where diabase meets surrounding shale and siltstone. These contact zones weather to produce uranium-enriched soils that generate elevated radon. Homes built near diabase ridges or outcrops — visible as the dark rocky terrain throughout the battlefield area — are at highest risk.
Do historic Civil War-era homes in Gettysburg have higher radon risk?
Historic stone and brick homes from the Civil War era frequently have fieldstone foundations, exposed dirt basements, and minimal vapor barriers — all of which increase radon entry. These structures require specialized mitigation approaches. DEP-certified contractors experienced with historic preservation can design systems that achieve depressurization without damaging original masonry or requiring visible exterior piping.
What does radon mitigation cost in Gettysburg?
Gettysburg area radon mitigation typically costs $900–$2,400. Historic stone-foundation homes cost more than standard construction. Properties on diabase ridges may have higher initial radon concentrations requiring more powerful fan systems. Request quotes from DEP-certified Adams County contractors.
What's the average radon level in Gettysburg?
Gettysburg's DEP-recorded basement average is 4.98 pCi/L across 2,978 tests. The EPA action level for mitigation is 4.0 pCi/L, so a sizable share of Gettysburg homes exceed the threshold. The highest single result in the local dataset is 269.0 pCi/L; this unusually high reading may reflect a source data anomaly or a single-home outlier — individual home results vary widely.
Do homes in Gettysburg need to be tested for radon?
Adams County is EPA Zone 1 — the highest radon-potential classification — so every home in Gettysburg 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 Gettysburg?
Active sub-slab depressurization (ASD) systems in the Gettysburg area typically cost $900–$2,400. 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 Gettysburg?
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 Gettysburg, 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 Gettysburg radon data cover?
The Gettysburg radon dataset on this page covers ZIP code 17325. These are the ZCTAs assigned to Gettysburg 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 Gettysburg Area School District buildings subject to SB 760?
Adams County is in EPA Zone 1 and is served by 6 school districts, including Gettysburg Area School District. Pennsylvania Senate Bill 760, if enacted as drafted, would apply to all public school buildings in Adams County regardless of which district operates them. The bill remains in committee. Buildings in Zone 1 counties like Adams County would be highest priority under 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.
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