--- title: "How to Find a Radon Expert in King of Prussia, PA: Testing, Mitigation & Cost Guide | Radon Roster" description: "King of Prussia, PA radon guide: 21% of 6,855 basement tests at or above 4 pCi/L (median 1.9). How to verify DEP certification, questions to ask, typical costs and real estate tips." canonical: https://radonroster.com/pa/city/king-of-prussia-pa/radon-guide/ --- [Pennsylvania](https://radonroster.com/)›[Cities](https://radonroster.com/pa/cities/)›[King of Prussia, PA](https://radonroster.com/pa/city/king-of-prussia-pa/)›Radon guide # How to find a radon expert in King of Prussia, PA King of Prussia tests lower than much of Pennsylvania, with **21%** of 6,855 basement tests at or above 4 pCi/L. That still leaves 1,408 tests over the action level, so a low average doesn't clear any single house. That's below Montgomery County as a whole (28%) and below the statewide share (37%). The median King of Prussia result (1.9 pCi/L) is below the 4 pCi/L line. The Montgomery County median is 2.4 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 King of Prussia municipality/mailing name. Counts tests, not homes, and includes repeat and post-mitigation tests. ## King of Prussia at a glance King of Prussia**21%** Montgomery Co.**28%** Statewide**37%** Share of basement tests ≥ 4 pCi/L **1.9**median pCi/L **6,855**tests on record **#30**of 33 guide cities [Get free quotes](https://radonroster.com/get-quotes/?city=king-of-prussia) [Browse all King of Prussia radon firms](https://radonroster.com/pa/city/king-of-prussia-pa/) · [Montgomery County](https://radonroster.com/pa/county/montgomery/) ## King of Prussia compared with other PA cities Among the 33 Pennsylvania cities with guides on Radon Roster, King of Prussia ranks **#30** by share of basement tests at or above 4 pCi/L. In Montgomery County, compare it with Lansdale, Norristown. About 1,408 King of Prussia basement tests in DEP's records were at or above 4 pCi/L. A DIY or certified test is cheap insurance even where the average is low. Nearby city guides: [Erie](https://radonroster.com/pa/city/erie-pa/radon-guide/) · [Norristown](https://radonroster.com/pa/city/norristown-pa/radon-guide/) · [Scranton](https://radonroster.com/pa/city/scranton-pa/radon-guide/) · [Wilkes-Barre](https://radonroster.com/pa/city/wilkes-barre-pa/radon-guide/) ## 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 King of Prussia 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/). ## Nearest certified radon firms Nearest DEP-certified firms: **1** based in King of Prussia (1 mitigation), **28** elsewhere in Montgomery County (7 mitigation), and **18** mitigation firms in neighboring counties. ### Air Quality Control, Inc. ✓ PA DEP certifiedMitigation King Of Prussia1 certified person #### Address * 630 Freedom Business Ctr, King Of Prussia, PA * ✉ [roger@aqc-radon.com](mailto:roger@aqc-radon.com) * [aqc-radon.com](http://www.aqc-radon.com/) #### Certified individuals * Burens, Jr., Roger (mitigation #1862) #### DEP cert IDs mitigation #1862 Source: [DEP list](https://files.dep.state.pa.us/RadiationProtection/RadonDivision/RDPortalFiles/2026/10_01/CountyMitigation.pdf), retrieved 2026-10-11 · [Claim, correct or remove this listing](https://radonroster.com/claim-listing/?firm=F1862) [**Call** (610) 239-4212](tel:6102394212) ### Accurate Radon Control Inc ✓ PA DEP certifiedMitigationTesting Green Lane2 certified people #### Address * Po Box 296, Green Lane, PA * ✉ [dave@accurateradoncontrol.com](mailto:dave@accurateradoncontrol.com) * [accurateradoncontrol.com](https://accurateradoncontrol.com/) #### Certified individuals * Demar, David (testing #2112, mitigation #2112) * Demar, Zachariah (mitigation #7709) #### DEP cert IDs mitigation #2112 · mitigation #2113 · mitigation #7709 · testing #2112 Source: [DEP list](https://files.dep.state.pa.us/RadiationProtection/RadonDivision/RDPortalFiles/2026/10_01/CountyMitigation.pdf) [DEP list](https://files.dep.state.pa.us/RadiationProtection/RadonDivision/RDPortalFiles/2026/10_01/CountyTest.pdf), retrieved 2026-10-11 · [Claim, correct or remove this listing](https://radonroster.com/claim-listing/?firm=F2112) [**Call** (215) 541-1557](tel:2155411557) ### Airotox ✓ PA DEP certifiedMitigation Lansdale3 certified people #### Address * 14 E Main St, Lansdale, PA * ✉ [info@airotox.com](mailto:info@airotox.com) * [airotox.com](https://airotox.com/) #### Certified individuals * Achuff, Mark (mitigation #2741) * Achuff, Matthew (mitigation #7422) * Achuff, Ryan (mitigation #7424) #### DEP cert IDs mitigation #2741 · mitigation #3109 · mitigation #7422 · mitigation #7424 Source: [DEP list](https://files.dep.state.pa.us/RadiationProtection/RadonDivision/RDPortalFiles/2026/10_01/CountyMitigation.pdf), retrieved 2026-10-11 · [Claim, correct or remove this listing](https://radonroster.com/claim-listing/?firm=F2741) [**Call** (215) 247-6869](tel:2152476869) ### Gentry, Timothy J. ✓ PA DEP certifiedMitigationTesting Horsham1 certified person #### Address * Po Box 1642, Horsham, PA * ✉ [homeinspectiondetective@comcast.net](mailto:homeinspectiondetective@comcast.net) #### Certified individuals * Gentry, Timothy J. (testing #2217, mitigation #2217) #### DEP cert IDs mitigation #2217 · testing #2217 Source: [DEP list](https://files.dep.state.pa.us/RadiationProtection/RadonDivision/RDPortalFiles/2026/10_01/CountyMitigation.pdf) [DEP list](https://files.dep.state.pa.us/RadiationProtection/RadonDivision/RDPortalFiles/2026/10_01/CountyTest.pdf), retrieved 2026-10-11 · [Claim, correct or remove this listing](https://radonroster.com/claim-listing/?firm=F2217) [**Call** (215) 672-8529](tel:2156728529) ### Radon Technology & Enviromental Inc ✓ PA DEP certifiedMitigation Royersford5 certified people #### Address * 828 Oak St, Royersford, PA * ✉ [info@wefixradon.com](mailto:info@wefixradon.com) #### Certified individuals * Carney, Matthew (mitigation #7364) * Hadfield, John (mitigation #7627) * Kollmeyer, Jr., Bruce (mitigation #3024) * Kollmeyer, Shane (mitigation #7441) * Kollmeyer, Sr, Bruce (mitigation #7047) #### DEP cert IDs mitigation #1308 · mitigation #3024 · mitigation #7047 · mitigation #7364 · mitigation #7441 · mitigation #7627 Source: [DEP list](https://files.dep.state.pa.us/RadiationProtection/RadonDivision/RDPortalFiles/2026/10_01/CountyMitigation.pdf), retrieved 2026-10-11 · [Claim, correct or remove this listing](https://radonroster.com/claim-listing/?firm=F1308) [**Call** (610) 495-2810](tel:6104952810) ### Radon-Rid LLC ✓ PA DEP certifiedMitigationTesting Phoenixville1 certified person #### Address * 693 Egypt Rd, Phoenixville, PA * ✉ [info@radonrid.com](mailto:info@radonrid.com) * [radonrid.com](https://www.radonrid.com/) #### Certified individuals * Marino, Marc A. (testing #2585, mitigation #2585) #### DEP cert IDs mitigation #2585 · mitigation #2586 · testing #2585 Source: [DEP list](https://files.dep.state.pa.us/RadiationProtection/RadonDivision/RDPortalFiles/2026/10_01/CountyMitigation.pdf) [DEP list](https://files.dep.state.pa.us/RadiationProtection/RadonDivision/RDPortalFiles/2026/10_01/CountyTest.pdf), retrieved 2026-10-11 · [Claim, correct or remove this listing](https://radonroster.com/claim-listing/?firm=F2585) [**Call** (610) 222-2273](tel:6102222273) [See all firms near King of Prussia →](https://radonroster.com/pa/city/king-of-prussia-pa/) ## Buying or selling in King of Prussia? 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 King of Prussia 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 King of Prussia on Radon Roster shows its DEP IDs and a link to the source list. ## Questions to ask a mitigator before you sign * What warranty covers the fan and the work, and is it transferable if I sell? * Will you seal the sump, cracks or floor-wall joints, and is that in the quote? * Is a system monitor (manometer or alarm) included so I can see the fan is working? * Do you carry liability insurance, and will you put the full scope in writing? * 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? ## Frequently asked questions **How do I find a certified radon expert in King of Prussia, PA?** Use a firm on PA DEP's certified lists. Radon Roster lists 1 DEP-certified firms based in King of Prussia and 28 more in Montgomery 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. **Should I test if King of Prussia has lower radon than other PA towns?** Yes. Even here, 1,408 basement tests in DEP's records were at or above 4 pCi/L. EPA recommends every home be tested. **Is radon common in King of Prussia?** In PA DEP's test records, 21% of 6,855 basement tests with a King of Prussia address were at or above 4 pCi/L (median 1.9 pCi/L). Results vary house to house, so only a test tells you your level. **How much does radon mitigation cost in King of Prussia?** We don't have King of Prussia-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 King of Prussia mitigators[Request quotes](https://radonroster.com/get-quotes/?city=king-of-prussia) Our advice ## Before you hire in King of Prussia 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 King of Prussia. [Request quotes](https://radonroster.com/get-quotes/?city=king-of-prussia)