Radon and Real Estate Transactions in York, PA

Radon is common enough in York County that buyers, agents, and lenders expect it to come up. Of 81,840 basement radon tests reported to the Pennsylvania DEP across York County, 56.5% came in at or above the EPA action level of 4.0 pCi/L. An elevated result on a sale is routine, not a dealbreaker.

Source: Pennsylvania DEP, Radon Test Results (data.pa.gov), tests through July 2026. Retrieved September 30, 2026. These are tests reported to DEP by certified labs and testers, not a random sample of homes.

Because radon varies house to house, a seller's own test or a neighbor's reading does not tell a buyer anything about this particular home. That is why a fresh test during the inspection period is the standard, not a shared result.

Buyers usually order a radon test during the inspection period. For a real estate transaction, a professional test by a PA DEP-certified tester is what lenders and buyers expect, since the result needs to come from someone without a stake in the outcome.

Short-term DIY kits are fine for a homeowner checking their own place, but they are not the standard for a sale. See our radon testing in York, PA page for how the testing options compare and what a transaction requires.

A result at or above 4.0 pCi/L does not kill a sale. It usually becomes a negotiation point: a seller credit toward mitigation, or the system installed and retested before closing. The terms depend on the contract and the market, but mitigation is a normal, expected fix in a Pennsylvania home sale.

Cost is part of that negotiation. York County homeowners paid a median of $1,150 for a mitigation system from 2024 to 2026, with most jobs between $935 and $1,320. That gives both sides a real number to work from rather than a guess.

Source: Pennsylvania DEP, Radon Mitigation System records (data.pa.gov), York County systems reported 2024–2026. Retrieved September 30, 2026.

See the full breakdown on our radon mitigation cost page.

A sub-slab system can usually be installed and retested within the closing timeline. Across York County systems reported to DEP, the median radon level fell from 12 pCi/L before mitigation to 1.0 pCi/L after, and 97.4% of systems tested below 4.0 afterward. A buyer getting a confirmed, lower number before they own the home is the goal.

Source: Pennsylvania DEP, Radon Mitigation System records (data.pa.gov), York County systems reported 2024–2026. Retrieved September 30, 2026.

Whoever does the work must be PA DEP-certified. See how the systems are built on our how mitigation works page, and how to vet a contractor on our hiring guide.

Some York sellers test before listing so a high result is not a surprise during the inspection period. If it comes back elevated, you can address it on your own timeline and terms instead of under contract pressure. If it is low, you have a recent result to share.

Either way, the buyer's lender will likely still require their own certified test. Treat a pre-listing test as information for yourself, not a substitute for the buyer's test.