Radon Testing in Delaware, OH

Radon Testing in Delaware involves short-term (2-7 day) charcoal canister or continuous radon monitor placement on the lowest occupied level, working on the lowest lived-in level of the home where occupants spend more than 4 hours per day. The service is the first step for any home that has not been tested in the last 2 years, for any home being sold, and for any home after a significant foundation, basement, or HVAC modification.

Delaware's pre-1950 downtown near Ohio Wesleyan sits on older limestone and block basements with masonry walls that admit soil gas through the wall itself as much as through a slab crack. The newer subdivisions ringing downtown are on poured basements with sumps, a more straightforward sub-slab suction candidate. Glacial till across Delaware County keeps both halves of the city inside EPA Zone 1, so the split is about mitigation routing, not about whether elevated readings occur. Delaware sits directly on the Olentangy River, with Delaware Dam and Delaware Lake just north of downtown holding back the river's upper watershed. Delaware sits on geology that drives elevated regional radon exposure across the Columbus metro, including Delaware County.

Delaware County testing behaves consistently across EPA Zone 1 regardless of which half of the county a house sits in, though the older limestone-and-block downtown stock near Ohio Wesleyan warrants closer attention to sealing gaps around the foundation during the closed-house window than the newer sump-equipped construction along US 23.

ANSI/AARST MAH-2023 establishes the residential measurement protocol. Closed-house conditions must be maintained throughout short-term testing. The Ohio Department of Health Radon Licensing Program oversees radon program compliance for Delaware, and Ohio licensure under ORC 3723.02 applies to any contractor performing mitigation work in the state.