--- title: "Can Your Radon Level Differ From Your Neighbor's?" canonical: "https://radonmitigationyorkpa.net/radon-guide/neighbor-radon-levels/" pubDate: "2026-10-01T00:00:00.000Z" updatedDate: "2026-10-03T00:18:00.000Z" author: Radon Mitigation York PA description: "A neighbor's low radon test doesn't clear your home. Soil, cracks, foundation type and air flow make every house different. Here's why." --- # Can Your Radon Level Differ From Your Neighbor's? Yes, a lot. Two homes side by side can have very different radon levels. Soil under each house, foundation cracks, construction style and how each home moves air all change how much radon gets in. EPA says radon levels vary from home to home, so a neighbor's low result, or a low [radon average for your York ZIP code](/york-county-radon-levels/), does not mean your house is fine. ## Why next-door homes test differently ### The ground changes over short distances Soil and rock are not uniform. One lot may sit on fractured rock or a pocket of uranium-rich soil, while the next sits on denser clay. Underground cracks and channels can carry gas toward one foundation and away from another. In York County, where limestone and fractured metamorphic rock are common, those differences can be sharp. ### Every foundation is different Even in the same development, no two foundations are identical. One basement may have more cracks, an open sump pit, a floor drain or a gap where pipes enter. Another may have a crawl space addition with bare soil. Each opening is a path for radon. ### Construction and age Older York homes may have fieldstone walls with many joints. Block walls have hollow cores that carry soil gas. Poured concrete basements behave differently again. A home with a basement and one on a slab can sit on the same street and test far apart. ### How the house breathes The air pressure inside your house drives how much soil gas it pulls in. That depends on: - How tight or leaky the home is - Exhaust fans, dryers and range hoods - Fuel-burning furnaces and water heaters - Whether windows are open - How warm the inside is compared to outside Two similar homes can live very differently, and that changes radon. ### Testing differences Results also depend on where and when the test was done. A basement test in January will often read higher than a first-floor test in July. Before comparing numbers, check the test location, season and length. ## What the data shows PA DEP's York County test data shows how wide the spread is. In ZIP 17402, for example, the median test is about 4.6 pCi/L, yet the highest result on file is 260 pCi/L. ZIP averages show patterns, but they can't predict any single home. That is why EPA and PA DEP both recommend testing every home, even if neighbors have tested ([EPA's Citizen's Guide to Radon](https://www.epa.gov/sites/default/files/2016-12/documents/2016_a_citizens_guide_to_radon.pdf)). ## What about the reverse? If your neighbor tested high, don't assume you are high either. Your home may be fine. The only way to know is to test. A neighbor's high result is a good reminder to test, though. It tells you radon is present in the ground nearby. ## Does a neighbor's mitigation system affect your home? Generally no. A radon system pulls soil gas from under its own foundation. It does not meaningfully change the soil gas under your house. ## Foundation type matters too Some people think radon only matters in homes with basements. That isn't true. Slab and crawl space homes can also test high. Read more about [radon in homes without basements](/radon-guide/radon-in-homes-without-basements/). ## Key takeaways - Radon can vary a lot between neighboring homes. - Soil, foundation, construction and air flow all play a role. - Area data shows patterns but can't clear any single house. - EPA says every home should be tested. ## Frequently Asked Questions ### My neighbor's house is the same model as mine. Will our results match? Not necessarily. Same floor plans can still have different soil, cracks and living habits. Test your own home. ### Can I use a neighbor's test when selling my house? No. A buyer will want a test of the home being sold, done properly and recently. ## See your area's numbers Our York County radon levels page shows PA DEP test results by ZIP code. To find out your own number, call [(717) 356-3035](tel:+17173563035) any time for a same-day callback.