Radon Mitigation in Reading
Extreme radon risk. Reading sits directly on the Reading Prong formation — the densest uranium-bearing granitic bedrock in the eastern U.S., producing the highest statewide radon concentrations.
High Radon Risk Area
Reading sits in EPA Zone 1 — testing is recommended for every home regardless of age or foundation type.
Local Geology & Risk Factors
Reading is located in an area with Reading Prong (Granite/Gneiss) 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 →
Pennsylvania's role as the epicenter of residential radon awareness traces directly to the Reading Prong. In 1984, Stanley Watras — a construction engineer at the Limerick Generating Station in nearby Montgomery County — triggered radiation alarms at the nuclear plant before it had been fueled. The source was radon in his home, built on the same Reading Prong geology. His basement tested at over 2,700 pCi/L, roughly 675 times the EPA action level. The Watras case led to the EPA's first nationwide radon survey and directly catalyzed the passage of Pennsylvania's Radon Certification Act (Act 43 of 1987). Reading sits at the geological center of this same formation — closer to the uranium-dense core of the Reading Prong than Limerick, with older and more permeable building stock.
Quick Facts
- Median home value: $109,800 · Median year built: 1938
- Population: 94,836
- Foundation types: Basement (most common in older rowhouses); Crawlspace (moderate); Slab-on-grade (limited)
Berks County Context
Reading is a municipality of Berks County, EPA Zone 1. Zone designation is assigned at the county level, so Reading inherits its classification; countywide aggregate figures live on the county page.
See Berks County radon aggregate data →Measured Radon Data for Reading
Source: PA DEP RadonZip Tool, January 1990 – December 2025 · Updated 2026-05-20
Radon Mitigation Cost in Reading
Active sub-slab depressurization (ASD) systems in Reading typically cost $1,050–$2,529. 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 in older rowhouses)
- Crawlspace (moderate)
- Slab-on-grade (limited)
Systems used in the region
- Active sub-slab depressurization
- Drain tile depressurization
- Block wall 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 Reading, Berks 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 are radon levels so high in Reading, PA?
Reading sits directly on the Reading Prong, a geological formation rich in uranium-bearing granite and gneiss. As uranium decays, it produces radium, which decays into radon gas. This bedrock creates the highest ambient radon concentrations in the eastern U.S., with 58.7% of tested Reading homes exceeding EPA's 4 pCi/L action level.
What does radon mitigation cost in Reading, PA?
Active sub-slab depressurization (ASD) systems in Reading typically cost $1,050–$2,529. Reading's dense rowhouse stock and older basement construction can increase complexity. Block wall depressurization may be required for hollow-block foundations. Get quotes from DEP-certified local contractors.
Do Reading rowhouses have higher radon risk than detached homes?
Yes. Older rowhouse construction common in Reading often lacks modern vapor barriers and has porous concrete block foundations, both of which accelerate radon intrusion. The shared-wall construction doesn't mitigate soil gas migration from the Reading Prong bedrock below.
What's the average radon level in Reading?
Reading's DEP-recorded basement average is 5.64 pCi/L across 2,377 tests. The EPA action level for mitigation is 4.0 pCi/L, so a sizable share of Reading homes exceed the threshold. The highest single result in the local dataset is 99.2 pCi/L.
Do homes in Reading need to be tested for radon?
Berks County is EPA Zone 1 — the highest radon-potential classification — so every home in Reading 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 Reading?
Active sub-slab depressurization (ASD) systems in the Reading area typically cost $1,050–$2,529. 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 Reading?
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 Reading, 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 Reading radon data cover?
The Reading radon dataset on this page covers ZIP codes 19601, 19602, 19604, 19605, 19606, 19607, 19610, and 19611. These are the ZCTAs assigned to Reading 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 Reading-area public schools subject to SB 760?
Berks County is in EPA Zone 1 and is served by 19 school districts, including Reading School District. Pennsylvania Senate Bill 760, if enacted as drafted, would apply to all public school buildings in Berks County regardless of which district operates them. The bill remains in committee. Buildings in Zone 1 counties like Berks 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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