Radon Testing & Mitigation in Milford, PA
High radon risk from Devonian shale sequences including the Marcellus and Hamilton formations underlying Pike County. Milford, as the county seat, sits where the Appalachian Plateau descends toward the Delaware River on fractured Devonian bedrock with naturally elevated uranium content. Pike County's transformation from a seasonal recreation area to a year-round NYC commuter community means thousands of homes converted from seasonal use now operate as sealed, heated residences — conditions that concentrate indoor radon.
Moderate Radon Risk Area
Milford sits in EPA Zone 2 — testing is recommended for every home regardless of age or foundation type.
Radon Testing in Milford
In Milford-area ZIP codes, 38% of 6,330 basement tests reported to PA DEP measured 4.0 pCi/L or higher, with a median of 2.8 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
Milford is located in an area with Appalachian Plateau / Devonian Marcellus-Hamilton Shale Sequence 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: $361,000 · Median year built: 1959
- Population: 1,275
- Foundation types: Basement (predominant in year-round homes); Crawlspace (converted seasonal structures); Slab-on-grade (newer construction)
Pike County Context
Milford is a municipality of Pike County, EPA Zone 2. Zone designation is assigned at the county level, so Milford inherits its classification; countywide aggregate figures live on the county page.
See Pike County radon aggregate data →Measured Radon Data for Milford
These figures cover every test whose ZIP code is listed above. ZIP codes do not follow municipal lines, so the figures describe Milford-area ZIP codes, not the municipal boundary of Milford. 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 Milford
Active sub-slab depressurization (ASD) systems in Milford typically cost $1,000–$2,600. 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 year-round homes)
- Crawlspace (converted seasonal structures)
- Slab-on-grade (newer construction)
Systems used in the region
- Active sub-slab depressurization
- Sub-membrane depressurization (crawlspace)
- Radon-resistant new construction (RRNC)
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 Milford, Pike 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
Why is radon a particular concern for converted seasonal homes in Milford?
Thousands of Pike County homes were built as seasonal vacation structures with minimal foundations and natural ventilation. When converted to year-round residences, insulation upgrades, sealed windows, and continuous heating create a tighter building envelope that traps radon gas indoors. A home that was safe as a summer cabin can have significantly elevated radon as a winterized year-round residence. Testing after conversion is essential.
How does Marcellus Shale affect radon in Milford?
The Devonian Marcellus Shale and associated Hamilton Group formations underlie much of Pike County. These organic-rich black shales contain naturally elevated uranium from their deep-ocean depositional environment. As uranium decays through the radium-226 chain, radon-222 gas is produced within the rock matrix and migrates through fractures toward the surface. This is the same formation associated with natural gas extraction in western PA, but in Pike County the radon risk is the primary concern.
What does radon mitigation cost in Milford?
Milford area radon mitigation typically costs $1,000–$2,600. Converted seasonal homes with non-standard foundations may require custom system designs. Larger year-round residences common in Pike County's commuter communities require more extensive systems. Request quotes from DEP-certified Pike County contractors.
What share of radon tests in Milford-area ZIP codes are at or above the EPA action level?
38% of the 6,330 basement tests reported to PA DEP from Milford-area ZIP codes measured 4.0 pCi/L or higher, in line with the 37% statewide share. The median result is 2.8 pCi/L. Of 1,540 first-floor tests, 16% 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 Milford need to be tested for radon?
Pike County is EPA Zone 2, meaning the county has moderate radon potential and elevated readings are common enough that all Milford 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 Milford?
Active sub-slab depressurization (ASD) systems in the Milford area typically cost $1,000–$2,600. 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 Milford?
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 Milford, 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 Milford radon data cover?
The Milford radon dataset on this page covers ZIP code 18337. These are the ZCTAs assigned to Milford 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 Milford's municipal boundary.
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