Rapid City sits at the edge of the Black Hills, where the geology is very different from eastern South Dakota. The state's zone map puts western South Dakota in Zone 2, a moderate prediction, but local radon professionals have reported Rapid City homes far above the EPA's 4.0 action level. Nearby Custer County has the highest estimated average in the state in American Lung Association data, at 30.1 pCi/L.
Zone maps are predictions, not measurements. The state says plainly that they're no substitute for testing your own home.
What's different about Black Hills homes
- Rock and slopes. Homes built into hillsides or on rock can have walk-out basements, partial slabs or several foundation types. Systems sometimes need more than one suction point.
- Very high readings. Readings well above 4 aren't unusual in the Hills. High readings can still be brought down with a properly sized system.
- Home sales. Rapid City sees plenty of moves, including military families around Ellsworth. A radon contingency is common in purchase agreements.
We also connect homeowners in Box Elder, Sturgis and Spearfish.
Get a radon quote in Rapid City
Call (605) 496-9929 or request a quote online. We'll connect you with an independent, certified radon contractor who serves Rapid City. The referral is free and there's no obligation.
Sources: South Dakota DANR, Radon; American Lung Association data, reported by Dakota News Now (2023); EPA, Health Risk of Radon.