Water Quality Maps for Michigan by County
Agency: Environment, Great Lakes, and EnergyArsenic
Michigan has naturally higher arsenic levels in groundwater. Arsenic in drinking water may have harmful health effects depending on how much you consume and how sensitive you are to it. Since arsenic cannot be seen or tasted in water, a laboratory analysis is the only way to determine the arsenic level in drinking water wells.
In the links below are to county maps showing Arsenic levels in well water. In general, the sample results are from Type II nontransient noncommunity water supplies and residential water well samples submitted to EGLE Drinking Water Laboratory. These sample results are from 2009-2019. EGLE cannot guarantee the completeness or accuracy of the information contained in these datasets. To submit feedback or request data contact EGLE-EH@michigan.gov or 517-284-6535.
The U.S. Environmental Protection Agency (U.S. EPA) set an arsenic maximum contaminant level (MCL) for public water supplies at 0.010 mg/L. This is equivalent to 10 parts per billion (ppb), 0.010 parts per million (ppm), 10 micrograms/liter (μg/L). The EPA also sets the MCL Goal (MCLG) for drinking water. The MCLG is set at a level that uses the best available science to prevent potential health problems. The EPA has set the MCLG for arsenic at zero.
For private water supplies (i.e. individual residential wells) the arsenic drinking water health advisory recommendation is also 0.010 mg/L or 10 ppb. If the arsenic in your water exceeds 0.010 mg/L or 10 ppb, EGLE recommends that you do not use your well water for drinking or cooking.
If you need assistance with the maps or if you have any questions, please contact EGLE-EH@michigan.gov or
517-284-6535.
Need help understanding your private drinking water results? Visit Michigan.gov/bewellinformed.
Arsenic Maps
Summary (Read First)
Nitrate
Large amounts of nitrate in drinking water can cause serious illness in infants under six months of age.
Nitrate Brochure
Statewide Nitrate Map
County Nitrate Maps
Alcona - Antrim
Arenac - Benzie
Berrien - Charlevoix
Cheboygan - Crawford
Delta - Genesee
Gladwin - Hillsdale
Houghton - Iosco
Iron - Kalkaska
Kent - Leelanau
Lenawee - Macomb
Manistee - Menominee
Midland - Montmorency
Muskegon - Ogemaw
Ontonagon - Ottawa
Presque Isle - Schoolcraft
Shiawassee - Van Buren
Washtenaw - Wexford
VOCs
When found in drinking water, the source of Volatile Organic Compounds (VOCs) is generally associated with an industrial solvent release, landfill leachate, chemical transportation spill, a fuel spill and leak, illegal waste disposal etc. VOCs do not generally occur naturally in ground water.
County VOC Maps
Alcona - Antrim
Arenac - Benzie
Berrien - Charlevoix
Cheboygan - Crawford
Delta - Genesee
Gladwin - Hillsdale
Houghton - Iosco
Iron - Kalkaska
Kent - Leelanau
Lenawee - Macomb
Manistee - Menominee
Midland - Montmorency
Muskegon - Ogemaw
Ontonagon - Ottawa
Presque Isle - Schoolcraft
Shiawassee - Van Buren
Washtenaw - Wexford
