waterbycounty
Compiled federal source snapshot

Michigan Water Quality

Drinking water data for all 83 counties.

Avg SDWIS Compliance Index

55.4

Most Common Five-Year SDWIS Compliance Band

A

Counties with Data

83

of 83 total

County water atlas

Michigan water signals by county

A state-level 2.5D view across drinking-water compliance, watershed impairment, monitoring density, and streamflow snapshot context. Pin any county, switch layers, then use the lens controls to compare index ranges, recorded violation rates, or impaired watersheds without leaving the page.

Counties

83

Avg SDWIS index

55.4

Watersheds

0

ATTAINS counties

Monitoring

83

58 fresh USGS snapshots

State atlas layers combine EPA SDWIS health-based violations, EPA ATTAINS 303(d) impairment assessments, EPA Water Quality Portal monitoring sites, and representative USGS NWIS streamflow gauges. Streamflow values appear only for fresh pipeline snapshots, not as a continuously updated stream. County pages include the observation time and year.

Prepared by ByCounty Editorial TeamPublished by WaterByCounty

Multi-source coverage in Michigan

Beyond Drinking Water

EPA SDWIS

83/ 83

counties with drinking-water compliance data

401 health violations statewide (5yr)

EPA ATTAINS

—

No §303(d) assessments yet for Michigan

EPA WQP

2,731

monitoring sites across 83 counties

740,088 total readings (5yr window)

USGS NWIS

58

counties with a fresh pipeline snapshot

6 above45 below

State atlas notes

What stands out in Michigan

County water quality is not one number. The strongest read comes from comparing drinking-water compliance against watershed impairment, monitoring density, and streamflow context. Use these signals as a starting point, then open any county profile for source-level detail.

Compliance spread

Alcona County has the highest value in the published state SDWIS Compliance Index table at 86.2/100, while Barry County has the lowest at 11.4/100. That is a 74.8 point gap inside one state.

Zero health violations

26

3+ health violations

40

Monitoring hubs

Baraga County92 sitesGogebic County82 sitesWayne County80 sites

Lowest flow reads

Huron County7%Hillsdale County8%Clinton County10%

Highest fresh streamflow pipeline snapshots: Alpena County (152%, observation 2026), Oscoda County (146%, observation 2026), Otsego County (139%, observation 2026). These are source-data observations, not household tap-water conclusions.

All Michigan Counties

CountySDWIS Compliance Index
Alcona County86.2
Alpena County86.2
Arenac County86.2
Charlevoix County86.2
Cheboygan County86.2
Clare County86.2
Crawford County86.2
Dickinson County86.2
Grand Traverse County86.2
Gratiot County86.2
Iron County86.2
Kalkaska County86.2
Lake County86.2
Luce County86.2
Manistee County86.2
Mason County86.2
Missaukee County86.2
Monroe County86.2
Montmorency County86.2
Oceana County86.2
Ontonagon County86.2
Oscoda County86.2
Otsego County86.2
Presque Isle County86.2
Schoolcraft County86.2
Tuscola County86.2
Wayne County70.7
Macomb County70.3
St. Clair County69.3
Kalamazoo County66.9
Kent County66.9
Muskegon County66.3
Bay County65.9
Oakland County64.8
Saginaw County64.8
Washtenaw County63.1
Houghton County62.3
Ingham County61.9
Ottawa County59.8
Chippewa County58.9
Midland County58.6
Montcalm County58.3
St. Joseph County55.4
Eaton County53.2
Isabella County52.3
Jackson County49.5
Marquette County45.5
Ionia County44.4
Wexford County43.7
Sanilac County43.2
Genesee County41.4
Gogebic County40.3
Huron County39.7
Osceola County38.7
Antrim County37.8
Emmet County37.3
Allegan County36.6
Mecosta County34.3
Berrien County34.1
Hillsdale County34.1
Iosco County33.6
Newaygo County33.6
Branch County32.2
Van Buren County31.0
Livingston County30.3
Clinton County29.9
Calhoun County29.4
Lapeer County29.3
Lenawee County29.2
Delta County27.5
Ogemaw County27.5
Menominee County26.7
Leelanau County26.6
Shiawassee County25.7
Gladwin County25.6
Alger County23.5
Cass County22.7
Mackinac County15.6
Baraga County14.9
Roscommon County14.1
Benzie County13.2
Keweenaw County11.5
Barry County11.4

Frequently Asked Questions

Which Michigan county has the highest SDWIS Compliance Index?
Alcona County has the highest SDWIS Compliance Index in the published Michigan cohort at 86.2/100. This WaterByCounty relative comparison is not an EPA score and does not establish current conditions for a utility or address.
What does the Five-Year SDWIS Compliance Band mean?
The band is derived only from each county aggregation's recorded health-violation rate per 100,000 people served for the stated five-year source window. It is separate from the relative SDWIS Compliance Index and is not a current determination for a specific utility or address.
Which USGS streamflow records are shown across Michigan?
WaterByCounty has 58 fresh USGS pipeline snapshots in the published Michigan cohort. Each county page shows its observation timestamp and year. A pipeline snapshot is not a continuously updated reading or a tap-water safety measure.
Where can Michigan residents find current official information?
Review the applicable utility's Consumer Confidence Report, active notices, and the state drinking-water agency. WaterByCounty's county-level historical aggregations do not establish the current status of a specific utility, address, private well, or household plumbing system.
What does Water Quality Portal monitoring volume show in Michigan?
The published county records contain 740,088 results from 2,731 monitoring locations in the site's five-year aggregation. Monitoring volume does not by itself indicate better or worse water quality.

Data Sources

Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. The WaterByCounty SDWIS Compliance Index reflects the recorded rate and is not an EPA score.

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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