The testing was ordered by county commissioners after widespread community concerns over the presence of hexavalent chromium, a cancer-causing chemical.

Perfluorooctane sulfonic acid, or PFOS, is a member of the synthetic chemical group known ... risk of some cancers. A 2023 test of Mount Rushmore’s drinking water showed a PFOS concentration ...

"The children, my grandkids, I've drank the water. I'm a little freaked out over it. The Navy is testing for PFAS, which is a chemical found in the white foam that's used to douse fires.