How to find a radon expert in Williamsport, PA
In Williamsport, 6,668 basement radon tests in PA DEP's records give a median of 2.9 pCi/L, and 39% were at or above 4 pCi/L. That's below Lycoming County as a whole (46%) and about level with the statewide share (37%). The median Williamsport result (2.9 pCi/L) is below the 4 pCi/L line; it is still in the 2-4 pCi/L range where EPA says to consider fixing. The Lycoming County median is 3.6 pCi/L.
Source: computed 2026-10-11 from PA DEP's Radon Test Results (data.pa.gov, public domain), using tests with a Williamsport municipality/mailing name. Counts tests, not homes, and includes repeat and post-mitigation tests.
Williamsport at a glance
Share of basement tests ≥ 4 pCi/L
Get free quotes Browse all Williamsport radon firms · Lycoming County
Williamsport compared with other PA cities
Among the 33 Pennsylvania cities with guides on Radon Roster, Williamsport ranks #17 by share of basement tests at or above 4 pCi/L. About 2,607 Williamsport basement tests in DEP's records were at or above 4 pCi/L. A certified short-term test is a quick first step.
Nearby city guides: Altoona · Gettysburg · Greensburg · Cranberry Township
Questions to ask a mitigator before you sign
- Who does the follow-up test, and is it an independent certified tester?
- 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.)
What a typical Pennsylvania radon system install involves
Most systems use active soil depressurization (EPA Consumer's Guide to Radon Reduction). 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.
Nearest certified radon firms
Nearest DEP-certified firms: 1 based in Williamsport (1 mitigation), 1 elsewhere in Lycoming County (0 mitigation), and 2 mitigation firms in neighboring counties.
Jcn Radon Services Inc
✓ PA DEP certifiedMitigationTestingWilliamsport1 certified person
Jcn Radon Services Inc
✓ PA DEP certifiedMitigationTestingAddress
- 1911 Poco Farm Rd, Williamsport, PA
- ✉ jcnradonservices@gmail.com
Certified individuals
- Stiger, Timothy E. (testing #3518, mitigation #3518)
DEP cert IDs
Source: DEP list DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing
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Radon mitigation cost: what Williamsport 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. These are national figures, not local quotes. Prices depend on foundation type, the number of suction points and pipe routing. Try the estimate tool.
Buying or selling in Williamsport? 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; 68 Pa.C.S. Chapter 73).
- 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). 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 Williamsport radon contractor's PA DEP certification
- Check the name against DEP's current certified mitigation and testing lists in the PA DEP Radon Services Directory. The lists are updated periodically, and ours were retrieved 2026-10-11.
- 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).
- Still unsure? Call the PA DEP Radon Hotline at 800-237-2366.
Every firm listed for Williamsport on Radon Roster shows its DEP IDs and a link to the source list.
Frequently asked questions
How much does radon mitigation cost in Williamsport?
We don't have Williamsport-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.
How do I find a certified radon expert in Williamsport, PA?
Use a firm on PA DEP's certified lists. Radon Roster lists 1 DEP-certified firms based in Williamsport and 1 more in Lycoming County. Confirm any name in the PA DEP Radon Services Directory or call 800-237-2366.
Is radon common in Williamsport?
In PA DEP's test records, 39% of 6,668 basement tests with a Williamsport address were at or above 4 pCi/L (median 2.9 pCi/L). Results vary house to house, so only a test tells you your level.