Radon Help for Westerville, Ohio Homeowners
Westerville spans parts of Franklin and Delaware counties. Both counties are EPA Radon Zone 1. ODH county data (dashboard export Sept 24, 2026) shows arithmetic means of 6.0 pCi/L for both Franklin and Delaware, with roughly 46% and 50% of reported pre-mitigation tests above 4 pCi/L, respectively.
That does not tell you your address’s level. Only a test does.
Call (614) 363-6129 to get connected with a licensed Ohio professional for testing or mitigation in Westerville (ZIP codes such as 43081 and 43082).
Radon Testing · Radon Mitigation · FAQ
Disclosure: Referral service only. Not a licensed radon contractor.