--- title: "How to Find a Radon Expert in Chambersburg, PA: Testing, Mitigation & Cost Guide | Radon Roster" description: "Chambersburg, PA radon guide: 59% of 9,035 basement tests at or above 4 pCi/L (median 5.4). How to verify DEP certification, questions to ask, typical costs and real estate tips." canonical: https://radonroster.com/pa/city/chambersburg-pa/radon-guide/ --- [Pennsylvania](https://radonroster.com/)›[Cities](https://radonroster.com/pa/cities/)›[Chambersburg, PA](https://radonroster.com/pa/city/chambersburg-pa/)›Radon guide # How to find a radon expert in Chambersburg, PA About **59%** of basement tests in Chambersburg, about one in 2, came back at or above EPA's 4 pCi/L action level. That's out of 9,035 tests in PA DEP's records. That's close to Franklin County as a whole (59%) and above the statewide share (37%). The median Chambersburg result (5.4 pCi/L) is above the 4 pCi/L line, so a typical basement test here would call for action. The Franklin County median is 5.2 pCi/L. Source: computed 2026-10-11 from PA DEP's [Radon Test Results](https://data.pa.gov/Energy-and-the-Environment/Radon-Test-Results-September-1986-Current-Annual-C/vkjb-sx3k) (data.pa.gov, public domain), using tests with a Chambersburg municipality/mailing name. Counts tests, not homes, and includes repeat and post-mitigation tests. ## Chambersburg at a glance Chambersburg**59%** Franklin Co.**59%** Statewide**37%** Share of basement tests ≥ 4 pCi/L **5.4**median pCi/L **9,035**tests on record **#1**of 33 guide cities [Get free quotes](https://radonroster.com/get-quotes/?city=chambersburg) [Browse all Chambersburg radon firms](https://radonroster.com/pa/city/chambersburg-pa/) · [Franklin County](https://radonroster.com/pa/county/franklin/) ## Chambersburg compared with other PA cities Among the 33 Pennsylvania cities with guides on Radon Roster, Chambersburg ranks **#1** by share of basement tests at or above 4 pCi/L. About 5,333 Chambersburg basement tests in DEP's records were at or above 4 pCi/L. Most homes in a high-share area won't know their number until they test, so ask a certified tester to start there. Nearby city guides: [Camp Hill](https://radonroster.com/pa/city/camp-hill-pa/radon-guide/) · [York](https://radonroster.com/pa/city/york-pa/radon-guide/) ## Buying or selling in Chambersburg? Radon timing tips * Pennsylvania sellers must give buyers a property disclosure statement before an agreement of sale is signed. The Real Estate Commission's minimum form asks whether the seller knows of hazardous substances "including... radon" and whether the property has been tested ([49 Pa. Code § 35.335a](https://www.pacodeandbulletin.gov/secure/pacode/data/049/chapter35/s35.335a.html); [68 Pa.C.S. Chapter 73](https://www.legis.state.pa.us/WU01/LI/LI/CT/HTM/68/00.073..HTM)). * Sellers aren't required to test, but must not hide known defects (68 Pa.C.S. § 7308). * Real estate radon tests by certified testers follow DEP anti-tampering rules, including a signed non-interference agreement ([25 Pa. Code Chapter 240](https://files.dep.state.pa.us/RadiationProtection/BureauOfRadiationProtection/BRPPortalFiles/Chapter_240_2015-04-23.pdf)). Book the test early in the inspection contingency window, because short-term tests run at least 2 days plus lab time. * If a result is high near closing, ask certified mitigators for written quotes. Buyers and sellers often negotiate who pays for a system. General information, not legal advice. ## How to verify a Chambersburg radon contractor's PA DEP certification 1. Check the name against DEP's current certified mitigation and testing lists in the [PA DEP Radon Services Directory](https://www.pa.gov/agencies/dep/programs-and-services/radiation-protection/radon-division/radon-services-directory). The lists are updated periodically, and ours were retrieved 2026-10-11. 2. Ask for the DEP certification number and photo ID. Pennsylvania requires anyone doing radon testing, mitigation or lab work for the public to be DEP-certified ([25 Pa. Code Chapter 240](https://files.dep.state.pa.us/RadiationProtection/BureauOfRadiationProtection/BRPPortalFiles/Chapter_240_2015-04-23.pdf)). 3. Still unsure? Call the PA DEP Radon Hotline at 800-237-2366. Every firm listed for Chambersburg on Radon Roster shows its DEP IDs and a link to the source list. ## Nearest certified radon firms Nearest DEP-certified firms: **2** based in Chambersburg (0 mitigation), **3** elsewhere in Franklin County (0 mitigation), and **5** mitigation firms in neighboring counties. No mitigation firms are based in the county. See the neighboring-county firms on the city page. [See all firms near Chambersburg →](https://radonroster.com/pa/city/chambersburg-pa/) ## Questions to ask a mitigator before you sign * What is your PA DEP certification number, and will you show your DEP photo ID? (Certified people must show it on request under [25 Pa. Code Chapter 240](https://files.dep.state.pa.us/RadiationProtection/BureauOfRadiationProtection/BRPPortalFiles/Chapter_240_2015-04-23.pdf).) * Will you do diagnostic (sub-slab suction) testing before choosing fan size and suction points? * Where will the pipe run (inside or outside), and where will the fan and exhaust go? * What post-mitigation level do you guarantee, and what happens if the retest is high? * Who does the follow-up test, and is it an independent certified tester? ## What a typical Pennsylvania radon system install involves Most systems use **active soil depressurization** ([EPA Consumer's Guide to Radon Reduction](https://www.epa.gov/radon/consumers-guide-radon-reduction-how-fix-your-home)). The installer drills a suction point through the basement slab (or seals a crawlspace with a membrane), runs PVC pipe to an inline fan, and vents the exhaust above the roofline. Then they seal major openings and add a pressure gauge. A follow-up test should confirm the level dropped. PA DEP describes the confirm-then-mitigate steps on [PA DEP: Radon in the Home](https://www.pa.gov/agencies/dep/programs-and-services/radiation-protection/radon-division/radon-in-the-home). ## Radon mitigation cost: what Chambersburg homeowners can expect | Item | Typical range (national) | | --- | --- | | Mitigation system installed | $786-$1,274, average about $1,028 (reported range $395-$2,453) | | Professional radon test | $150-$800 | Source: [HomeAdvisor cost guide](https://www.homeadvisor.com/cost/environmental-safety/remove-radon-gas/). These are national figures, not local quotes. Prices depend on foundation type, the number of suction points and pipe routing. Try the [estimate tool](https://radonroster.com/radon-mitigation-cost/). ## Frequently asked questions **How do I find a certified radon expert in Chambersburg, PA?** Use a firm on PA DEP's certified lists. Radon Roster lists 2 DEP-certified firms based in Chambersburg and 3 more in Franklin County. Confirm any name in the [PA DEP Radon Services Directory](https://www.pa.gov/agencies/dep/programs-and-services/radiation-protection/radon-division/radon-services-directory) or call 800-237-2366. **Is radon common in Chambersburg?** In PA DEP's test records, 59% of 9,035 basement tests with a Chambersburg address were at or above 4 pCi/L (median 5.4 pCi/L). Results vary house to house, so only a test tells you your level. **How much does radon mitigation cost in Chambersburg?** We don't have Chambersburg-specific price data. A national cost guide puts typical installs at $786-$1,274 (average about $1,028). Get written quotes from certified local mitigators. **Do I need a radon test when buying a home in Pennsylvania?** It isn't required by state law. The seller's disclosure form asks about known radon and past testing, and many buyers order a test during the inspection period. Real estate tests by certified testers follow DEP anti-tampering rules. **How long does a radon test take?** Short-term tests run 2 to 7 days. Long-term tests run more than 90 days. PA DEP suggests confirming a high short-term result before deciding on mitigation. **Want firms to contact you?**One request to Chambersburg mitigators[Request quotes](https://radonroster.com/get-quotes/?city=chambersburg) Our advice ## Before you hire in Chambersburg 1. Ask for the DEP cert ID and match it to the listing. 2. Get at least two written quotes for mitigation. 3. Retest after the system is installed. PA Radon Hotline **800-237-2366** Typical mitigation cost $786–$1,274 National range (HomeAdvisor). No local price data; quotes vary by foundation type. [Estimate your cost →](https://radonroster.com/radon-mitigation-cost/) ## Want firms to contact you? Send one request to certified mitigators who serve Chambersburg. [Request quotes](https://radonroster.com/get-quotes/?city=chambersburg)