Radon testing & mitigation in Sullivan County, PA
39% of basement tests here came back at or above 4 pCi/L, about level with the statewide 37%. That means about one in 3 homes tested needs a fix.
Sullivan County radon test data
Share of basement tests ≥ 4 pCi/L
First floor: 16% of 176 tests ≥ 4 pCi/L, median 1.2
Source: computed 2026-10-11 from PA DEP's Radon Test Results, Sept 1986 - Current (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.
0 DEP-certified firms have a business address in Sullivan County (0 offer mitigation), with 0 certified individuals between them. Get free quotes
No DEP-certified firms list an address in this county. Firms based in the neighboring counties below often serve nearby areas.
Neighboring counties
Bradford (1 firms) · Columbia (2 firms) · Luzerne (13 firms) · Lycoming (2 firms) · Wyoming (0 firms). Firms often serve across county lines.
Adjacency from U.S. Census Bureau county adjacency file.