Radon testing & mitigation in Mercer County, PA

35% of basement tests here came back at or above 4 pCi/L, a little under the statewide 37%. That means about one in 3 homes tested needs a fix.

Mercer County radon test data

Mercer35%

Statewide37%

Share of basement tests ≥ 4 pCi/L

2.9median basement pCi/L

9,723basement tests on record

#52of 67 PA counties by share ≥ 4

First floor: 13% of 1,201 tests ≥ 4 pCi/L, median 1.4

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 Mercer 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

Butler (12 firms) · Crawford (3 firms) · Lawrence (2 firms) · Venango (2 firms). Firms often serve across county lines.

Adjacency from U.S. Census Bureau county adjacency file.

Want firms to contact you?One request to Mercer mitigatorsRequest quotes