--- title: "Radon Testing & Mitigation in Williamsport, PA | Certified Pros & Local Data" description: "39% of 6,668 basement radon tests in Williamsport, PA were at or above 4 pCi/L (PA DEP data). Find DEP-certified radon testers and mitigators nearby." canonical: https://radonroster.com/pa/city/williamsport-pa/ --- [Pennsylvania](https://radonroster.com/)›[Cities](https://radonroster.com/pa/cities/)›Williamsport # Radon testing & mitigation in Williamsport, PA Williamsport sits in Lycoming County. In the PA DEP test dataset, 6,668 basement radon tests carry a Williamsport address. Their median was **2.9 pCi/L**, and **39%** came in at or above EPA's 4 pCi/L action level. Across all of Lycoming County it was 46%, and statewide 37%. Even where the average is lower, neighboring houses can test very differently, so every home should be tested. ## Williamsport radon test data Williamsport**39%** Lycoming Co.**46%** Statewide**37%** Share of basement tests ≥ 4 pCi/L **2.9**median pCi/L **6,668**tests on record **1**firms based here City figures come from the municipality / mailing-address name in [PA DEP's Radon Test Results](https://data.pa.gov/Energy-and-the-Environment/Radon-Test-Results-September-1986-Current-Annual-C/vkjb-sx3k) (computed 2026-10-11). They count tests, not homes. Below are the PA DEP-certified firms with a business address in Williamsport, then other firms in Lycoming County, then mitigation firms in the counties next door. Certified pros often travel, so ask each one whether they cover your street. [**Read the Williamsport radon hiring guide →**](https://radonroster.com/pa/city/williamsport-pa/radon-guide/) (how to verify certification, questions to ask, costs, FAQ) ## Firms based in Williamsport (1) [Mitigation1](#local-mitigation)Testing 0Labs 0Ordered by town, then name · never by payment ## Radon mitigation (reduction systems) (1 firm) Firms certified to install radon reduction systems. Firms that also test are shown here once. ### Jcn Radon Services Inc ✓ PA DEP certifiedMitigationTesting Williamsport1 certified person #### Address * 1911 Poco Farm Rd, Williamsport, PA * ✉ [jcnradonservices@gmail.com](mailto:jcnradonservices@gmail.com) #### Certified individuals * Stiger, Timothy E. (testing #3518, mitigation #3518) #### DEP cert IDs mitigation #3518 · mitigation #3565 · testing #3518 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=F3518) [**Call** (570) 988-6800](tel:5709886800) ## Elsewhere in Lycoming County (1) Mitigation 0[Testing1](#county-testing)Labs 0Ordered by town, then name · never by payment ## Radon testing (1 firm) ### Mcclain, Joshua ✓ PA DEP certifiedTesting Montoursville1 certified person #### Address * 1921 Round Top Rd, Montoursville, PA * ✉ [josh@wbinspections.com](mailto:josh@wbinspections.com) * [wbinspections.com](https://www.wbinspections.com/) #### Certified individuals * Mcclain, Joshua (testing #3414) #### DEP cert IDs testing #3414 Source: [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=F3414) [**Call** (570) 560-2773](tel:5705602773) ## Mitigation firms in neighboring counties (2) ### Conklin, George, Iv ✓ PA DEP certifiedMitigationClinton County Loganton1 certified person #### Address * 1351 W Winter Rd, Loganton, PA * ✉ [gconk23@cs.com](mailto:gconk23@cs.com) #### Certified individuals * Conklin, George, Iv (mitigation #2769) #### DEP cert IDs mitigation #2769 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=F2769) [**Call** (570) 433-8210](tel:5704338210) ### Ralston, Jeffrey ✓ PA DEP certifiedMitigationTestingColumbia County Bloomsburg1 certified person #### Address * 422 Valley Rd, Bloomsburg, PA * ✉ [paradonsolutions@yahoo.com](mailto:paradonsolutions@yahoo.com) #### Certified individuals * Ralston, Jeffrey (testing #3163, mitigation #3163) #### DEP cert IDs mitigation #3163 · testing #3163 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=F3163) [**Call** (570) 384-3574](tel:5703843574) ## Lycoming County radon test data Lycoming**46%** Statewide**37%** Share of basement tests ≥ 4 pCi/L **3.6**median basement pCi/L **15,471**basement tests on record **#36**of 67 PA counties by share ≥ 4 First floor: **21%** of 2,844 tests ≥ 4 pCi/L, median 1.6 Source: computed 2026-10-11 from PA DEP's [Radon Test Results, Sept 1986 - Current](https://data.pa.gov/Energy-and-the-Environment/Radon-Test-Results-September-1986-Current-Annual-C/vkjb-sx3k) (data.pa.gov, public domain). Counts tests, not homes: repeat and post-mitigation tests are included. Only a test tells you your home's level. [All Lycoming County listings →](https://radonroster.com/pa/county/lycoming/) · [Williamsport radon guide](https://radonroster.com/pa/city/williamsport-pa/radon-guide/) **Want firms to contact you?**One request to Williamsport mitigators[Request quotes](https://radonroster.com/get-quotes/?city=williamsport) Our advice ## Before you hire in Williamsport 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 Williamsport. [Request quotes](https://radonroster.com/get-quotes/?city=williamsport)