Updated · Rapid City, South Dakota

Bottom line: Test the house air. Do not rip out countertops based on internet fear. If levels are high, mitigate the soil pathway.1

Why countertops get blamed

Granite can contain uranium and thorium. In rare cases, specific slabs have measurable emissions. Population-level research and EPA guidance still point to soil under homes as the primary indoor radon source.

What to do instead

  1. Perform a proper home air test in the lowest lived-in level.
  2. If elevated, install ASD-style mitigation.
  3. Only investigate specialty stone emissions if levels remain stubborn after soil-gas control—an uncommon scenario.

Sources

  1. U.S. EPA. Radon and granite countertops — consumer guidance summarizing soil gas as the main source.

Need a local next step? Call (605) 600-6282 to talk through testing, real estate timing, or mitigation for your Rapid City–area home.