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Michigan Water Quality
667
Utilities in database
7.3M
Residents served
42%
On private wells
2
Key contaminants tracked
Drinking Water in Michigan
Michigan has 667 community water systems serving approximately 7.3 million residents. Primary water sources include groundwater. The most commonly reported contaminants include lead, disinfection byproducts. 42% of Michigan residents rely on private wells. EGLE holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Michigan
Top 20 of 667 by populationCity of Detroit
MI0001800 · 633,218 served
Grand Rapids
MI0002790 · 306,901 served
Kalamazoo
MI0003520 · 192,992 served
Lansing Board of Water & Light
MI0003760 · 166,000 served
City of Warren
MI0006900 · 134,056 served
City of Sterling Heights
MI0006385 · 127,000 served
Ann Arbor
MI0000220 · 123,851 served
Dearborn
MI0001730 · 109,976 served
Clinton Township
MI0001480 · 100,513 served
Canton Township
MI0001100 · 99,627 served
Livonia
MI0003930 · 96,942 served
Macomb Township
MI0003990 · 90,000 served
Troy
MI0006690 · 85,854 served
Westland
MI0007040 · 85,420 served
City of Flint
MI0002310 · 81,252 served
Rochester Hills
MI0000325 · 74,000 served
Genesee County Water System
MI0002615 · 73,726 served
Waterford Township
MI0006910 · 73,441 served
Wyoming
MI0007220 · 72,125 served
Shelby Township
MI0006010 · 72,000 served
Key Contaminant Concerns in Michigan
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
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Data source: Utility data from EPA SDWIS. 667 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-17