Radon mitigation in Mount Healthy, OH

Mount Healthy fits about 3,400 homes into roughly 1.5 square miles. The city added residents in every census from 1900 through 1970, climbing from 1,354 to 7,446, so one block can put an early-1900s house on a stone or brick foundation beside a 1950s house on block walls, and a neighbor's radon result says little about the house next door. The older of those two foundations usually needs its walls sealed along with the floor, while the postwar basement behaves like the rest of the county's mid-century stock. Run the test on the lowest level used as living space.

Mount Healthy sits on the upland north of Cincinnati at about 837 feet, with the West Fork of Mill Creek draining the uplands north of the city; it was settled in 1817 as Mount Pleasant, renamed after its residents came through a mid-1800s cholera epidemic, and became a city in 1951.