Water Quality Maps for Michigan by County

Agency: Environment, Great Lakes, and Energy

Arsenic

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 Brochure

Arsenic Maps

Summary (Read First)

Counties A-B

Counties C-D

Counties E-I

Counties J-L

Counties M

Counties N-R

Counties S-W

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.

Statewide VOC Map

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