Manganese is a metal found in soil, rocks and minerals, frequently with iron.
If you live in Northern Wisconsin, you might also find manganese in your water.
Last year, the Wisconsin Department of Natural Resources found elevated levels of manganese in public water supplies in counties across northern and western parts of the state.
That includes Oneida, Iron and Marathon counties.
Because of this, the Oneida County Health Department is encouraging Northwoods residents to get their well water tested.