waterbycounty

Michigan Water Quality

Drinking water data for all 83 counties.

Avg Water Score

58.5

State Grade

D

Counties with Data

83

of 83 total

All Michigan Counties

CountyWater Score
Alcona County86.0
Alpena County86.0
Arenac County86.0
Charlevoix County86.0
Cheboygan County86.0
Clare County86.0
Crawford County86.0
Dickinson County86.0
Grand Traverse County86.0
Iron County86.0
Kalkaska County86.0
Lake County86.0
Leelanau County86.0
Luce County86.0
Manistee County86.0
Mason County86.0
Missaukee County86.0
Monroe County86.0
Montmorency County86.0
Oceana County86.0
Ontonagon County86.0
Osceola County86.0
Oscoda County86.0
Otsego County86.0
Presque Isle County86.0
Roscommon County86.0
Schoolcraft County86.0
Tuscola County86.0
Kalamazoo County71.3
Muskegon County70.1
Wayne County69.7
Macomb County68.6
St. Clair County65.6
Houghton County65.3
Kent County64.8
Saginaw County64.8
Chippewa County63.0
Oakland County62.6
Ingham County61.7
Washtenaw County61.4
Huron County60.4
Ottawa County60.1
Bay County59.1
Wexford County58.9
Gogebic County56.6
Gratiot County56.4
Eaton County56.3
St. Joseph County56.3
Sanilac County55.4
Montcalm County54.8
Marquette County52.7
Jackson County52.5
Isabella County52.3
Ionia County52.2
Midland County51.4
Allegan County47.0
Alger County44.9
Newaygo County42.8
Antrim County40.8
Emmet County40.3
Iosco County39.3
Calhoun County37.8
Livingston County37.1
Genesee County36.1
Berrien County35.6
Branch County35.5
Hillsdale County31.5
Mecosta County31.3
Gladwin County30.6
Van Buren County30.1
Ogemaw County28.2
Menominee County27.2
Cass County26.9
Lenawee County23.9
Lapeer County23.5
Delta County23.1
Shiawassee County23.0
Clinton County21.6
Mackinac County19.6
Benzie County14.7
Barry County14.0
Baraga County12.9
Keweenaw County6.1

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Frequently Asked Questions

Which county in Michigan has the best water quality?
Alcona County has the highest water quality score in Michigan at 86.0/100 (Grade: A), based on EPA SDWIS data.
Which county in Michigan has the most water violations?
Keweenaw County has among the lowest water quality scores in Michigan at 6.1/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in Michigan?
Michigan has an average water quality score of 58.5/100 based on EPA Safe Drinking Water Act compliance data. Individual county scores vary — check your specific county's page for detailed information.
What contaminants are found in Michigan water supplies?
Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.

Data Source

Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

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