A radon test now shows up in a large share of York County home inspections. Radon is common across south-central Pennsylvania. The number that comes back can shape negotiations, repair requests and how fast you reach the closing table. Understanding how the test runs keeps both sides from being blindsided.
Why Radon Comes Up in York Home Sales
York County sits in Environmental Protection Agency (EPA) Zone 1, the highest radon potential category on the EPA map of radon zones (opens in a new tab), and plenty of homes here test at or above the EPA action level of 4.0 picocuries per liter (pCi/L), or 148 Bq/m³. Pennsylvania’s Real Estate Seller Disclosure Law (68 Pa.C.S. §§ 7301 to 7315) requires sellers to disclose known material defects under § 7303, and the mandated form records radon under § 7304(b)(14). Section 7308 places no duty on a seller to test. Any seller who has tested before, or installed a system, should keep that paperwork within reach.
How a Real Estate Radon Test Works
Most tests done for a sale are short-term tests running at least 48 hours. A continuous monitor goes in the lowest livable level of the house. Closed-house conditions hold for the 12 hours before the test and all the way through it. That means exterior windows and doors stay shut, aside from normal walking in and out.
Continuous monitors log a reading every hour rather than producing one blended average. That record shows everyone whether conditions stayed steady, and it will expose an open window or any other interference that could have skewed the result.
Tips for Sellers
- Keep windows and doors closed during the test, and remind anyone who shows the house.
- Leave the monitor exactly where it was set, and never unplug it to free an outlet.
- If a radon system is already installed, confirm the fan runs and the sump lid is sealed.
- Hand your agent every past radon report and any system paperwork you still have.
Tips for Buyers
- Schedule radon testing with a PA DEP-certified tester early in the inspection period so there is room to respond to the number.
- Ask whether a system is already in place, and go look at the manometer yourself.
- If a system exists, request recent test results and details about who installed it.
- Read the EPA radon resources for the real estate community (opens in a new tab) for background before you negotiate.
What Happens If the Result Comes Back High
A reading at or above 4.0 pCi/L is common around here, and it is fixable for $875 to $2,200. Deals usually land on one of a few outcomes: the seller arranges a radon system installation before closing, the buyer takes a credit and installs afterward, or the two sides split it somehow. Most York sub-slab systems go in within a single day, which is why this rarely delays a settlement.
Once the system is running, a follow-up test happens after at least 24 hours of operation. That second number is what gives both parties documentation showing the house now sits below the action level.
Homes That Already Have a System
An existing system is a selling point, but only when it actually works. A silent fan or a flat manometer usually points toward radon fan replacement. An unsealed sump lid, cracked pipe or sounding alarm calls for radon system repair. Houses with finished lower levels often need the sealing approaches covered under basement radon mitigation.
If your result comes back high, book a free estimate with our certified York crew. Radon Mitigation York is a PA DEP-certified mitigation firm, and our team will call buyers and sellers to discuss timing before closing.
For more local background, read about radon levels in York County, or see how radon mitigation in York works from the first test to the final result.
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