Radon testing & mitigation in Columbia County, PA
51% of basement tests here came back at or above 4 pCi/L, well above the statewide 37%. That means about one in 2 homes tested needs a fix.
Columbia County radon test data
Share of basement tests ≥ 4 pCi/L
First floor: 24% of 2,269 tests ≥ 4 pCi/L, median 1.6
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.
2 DEP-certified firms have a business address in Columbia County (1 offer mitigation), with 2 certified individuals between them. Get free quotes
Radon mitigation (reduction systems) (1 firm)
Firms certified to install radon reduction systems. Firms that also test are shown here once.
Ralston, Jeffrey
✓ PA DEP certifiedMitigationTestingBloomsburg1 certified person
Ralston, Jeffrey
✓ PA DEP certifiedMitigationTestingAddress
- 422 Valley Rd, Bloomsburg, PA
- ✉ paradonsolutions@yahoo.com
Certified individuals
- Ralston, Jeffrey (testing #3163, mitigation #3163)
DEP cert IDs
Source: DEP list DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing
Radon testing (1 firm)
Devries, Walter
✓ PA DEP certifiedTestingMillville1 certified person
Devries, Walter
✓ PA DEP certifiedTestingAddress
- 203 Hogs Back Rd, Millville, PA
- ✉ walt@rockhouseinspection.com
- rockhouseinspection.com
Certified individuals
- Devries, Walter (testing #3598)
DEP cert IDs
Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing
Neighboring counties
Luzerne (13 firms) · Lycoming (2 firms) · Montour (0 firms) · Northumberland (1 firms) · Schuylkill (5 firms) · Sullivan (0 firms). Firms often serve across county lines.
Adjacency from U.S. Census Bureau county adjacency file.
Hiring a radon pro in Columbia County: quick guide
With 51% of 10,285 basement tests at or above 4 pCi/L (above the 37% statewide share), Columbia County has 1 DEP-certified mitigation firm based locally.
- Verify: check the firm in the PA DEP Radon Services Directory, ask for the DEP ID (25 Pa. Code Chapter 240), or call 800-237-2366.
- Typical cost: $786-$1,274 for a mitigation system, national range from the HomeAdvisor cost guide.
- Selling or buying: PA's seller disclosure form asks about known radon and past tests (49 Pa. Code § 35.335a).
Frequently asked questions
How many certified radon mitigation firms are in Columbia County?
1 DEP-certified firms offering mitigation and 2 certified radon firms in total list a business address in Columbia County (PA DEP lists dated 10/01/2026). Firms from neighboring counties may also serve the area.
What share of Columbia County radon tests are high?
51% of 10,285 basement tests in PA DEP's records were at or above EPA's 4 pCi/L action level, with a median of 4.1 pCi/L.
How much does radon mitigation cost in Columbia County?
We don't have county-specific price data. A national cost guide reports typical installs at $786-$1,274. Get written quotes from DEP-certified mitigators.