Arsenic is a metal often found in nature in low amounts. Elevated levels of inorganic arsenic, the more harmful form to humans, have been found in the groundwater in some areas of Michigan. Groundwater is water that flows and collects under the ground. Aquifers are underground formations containing groundwater. Organic arsenic is not found in groundwater.
Inorganic arsenic is believed to exist naturally in certain geologic formations in the state.
Arsenic contamination appears to be highest in some wells in the shaded areas shown on the map to the right. The Michigan Department of Environmental Quality recommends that you check with your local health department about the need to have your drinking water tested for arsenic. Aquifers contain elevated levels of arsenic in some areas of Michigan. This may result in elevated levels of inorganic arsenic in well water. Arsenic has no smell or taste in water, so you cannot sense if arsenic is present.