Pennsylvania Data Shows 97.4% of York County Radon Systems Test Below EPA Action Level
York, Pennsylvania — October 20, 2026 — Records from the Pennsylvania Department of Environmental Protection show that 97.4% of the 701 radon mitigation systems installed in York County between 2024 and 2026 tested below the EPA's action level of 4.0 picocuries per liter (pCi/L) after installation, according to the York Radon Mitigation Guide, which has added a radon mitigation cost calculator to its online resources based on that same state data.
The EPA recommends mitigation when indoor radon levels reach or exceed that threshold. The calculator is intended to give homeowners a data-based estimate of what a system typically costs in the local market.
According to the DEP records, the middle half of those 701 systems cost between $935 and $1,320, with a median of $1,150. The figures reflect systems reported by York County contractors to the state agency during the two-year period.
Radon is a radioactive gas that forms naturally from the decay of uranium in soil and rock. It is odorless and invisible, and the EPA identifies it as the leading cause of lung cancer among non-smokers in the United States. Testing is the only way to determine whether a home has elevated levels.
The guide describes the components of a typical radon mitigation system, including sub-slab depressurization, sealing of entry points, and venting arrangements. It also outlines the steps involved in hiring a mitigator certified by the Pennsylvania DEP, which maintains a list of certified contractors in the state.
The calculator uses the reported cost range and median as reference points. Actual costs can vary with home size, foundation type, and the mitigation method selected.
The underlying records are available through the Pennsylvania DEP's open data portal at data.pa.gov and were retrieved on September 30, 2026. The York Radon Mitigation Guide states that its calculator is based on those records and does not represent an offer of mitigation services.
"The DEP data gives homeowners a factual starting point for budgeting," said a representative of The Company. "The reported range and the post-installation test results are the two figures most often requested by York County residents."
About The Company
The Company publishes the York Radon Mitigation Guide, an online resource covering radon testing, mitigation methods, and contractor selection for homeowners in York County, Pennsylvania. The guide draws on public records from the Pennsylvania Department of Environmental Protection and the U.S. Environmental Protection Agency.