Radon Mitigation Systems in Colerain Township, OH

Half of Colerain Township's homes were built between 1947 and 1967. The township's housing plan put the median home at close to 50 years old and counted 81 percent of units as single-family houses, so the usual radon job here is a postwar basement now roughly 60 to 80 years old, commonly on a slab poured with no membrane beneath it and carrying decades of shrinkage cracks, each one a soil-gas path to seal. Subdivisions built since then more often come with a sump that can double as the suction point. With about half its land wooded and 15 percent farmed as of 1990, the township can also turn up rural houses where a crawl space or an older foundation calls for a membrane or wall sealing rather than a single floor penetration. Colerain Township spreads across 42.9 square miles of northern Hamilton County, gentle wooded hills that divide the Mill Creek and Great Miami River basins; John Dunlap settled Dunlap's Station on a bend of the Great Miami in 1790, and the villages of Barnesburg, Bevis, Dunlap, and Groesbeck grew up along Blue Rock and Colerain roads in the early 1800s. Colerain Township sits on the Cincinnati Arch geology (fractured Ordovician limestone and shale) that drives elevated regional radon exposure across the entire Greater Cincinnati metro, including Hamilton County.

In ZIP 45247 (Colerain Township), 25% of the 1,016 tests reported to the Ohio Department of Health since 2010 came back above 4.0 pCi/L, the level at which EPA recommends fixing the home. A Colerain Township house above that line is routine work for a sub-slab system, not an edge case.

In Hamilton County, sub-slab depressurization has to account for both ends of the housing stock: a single cored suction point on Cincinnati's 1920s-1960s block basements, and, on the pre-Civil-War stone rubble stock in Over-the-Rhine and the West End, sealing at the wall itself in addition to the slab, because soil gas enters through the fractured Ordovician limestone-and-shale wall as much as through any single crack.

In Ohio, radon mitigation is licensed work under ORC Chapter 3723 (Ohio Department of Health Radon Licensing Program), done to the state rules in OAC 3701-69; the consensus standard for existing homes is ANSI/AARST SGM-SF-2023. The Ohio Department of Health Radon Licensing Program oversees radon program compliance for Colerain Township, and Ohio licensure under ORC 3723.02 applies to any contractor performing mitigation work in the state.