Michigan tap water
5 of 307 Michigan water systems with full PFAS testing (2%) averaged above a 2024 federal PFAS level at one or more sampling points.
- 1,370 active community water systems in the EPA file; 286 serve 3,300+ people and have a full PFAS set.
- 243 systems had at least one health-based violation since 2021-10-26.
- 52 systems report a lead 90th percentile above 15 ppb (some results are old; check each system page).
Largest systems
| System | People served | PFAS above a 2024 level? | Health-based violations since 2021-10-26 |
|---|---|---|---|
| Detroit City of | 633,218 | No | 0 |
| Grand Rapids | 306,901 | No | 0 |
| Kalamazoo | 192,992 | Yes, at one or more sampling points | 0 |
| Lansing Board of Water & Light | 166,000 | No | 0 |
| Warren, City of | 134,056 | No | 0 |
| Sterling Heights, City of | 127,000 | No | 0 |
| Ann Arbor | 123,851 | No | 0 |
| Dearborn | 109,976 | No | 0 |
Counties
Wayne County41 systems with full PFAS testingOakland County39 systems with full PFAS testingMacomb County19 systems with full PFAS testingKent County14 systems with full PFAS testingGenesee County12 systems with full PFAS testingOttawa County11 systems with full PFAS testingSt. Clair County11 systems with full PFAS testing
All 42 utilities with a page in Michigan
- Ann Arbor 123,851
- Battle Creek - Verona System 43,975
- Bloomfield Township 41,691
- Canton Township 99,627
- Chesterfield Township 41,650
- Clinton Township 100,513
- Dearborn 109,976
- Dearborn Heights 57,774
- Detroit City of 633,218
- Farmington Hills, City of 56,984
- Flint, City of 81,252
- Genesee County Water System 73,726
- Georgetown Township 41,086
- Grand Rapids 306,901
- Holland Board of Public Works 49,687
- Kalamazoo 192,992
- Lansing Board of Water & Light 166,000
- Livonia 96,942
- Macomb Township 90,000
- Midland, City of 42,547
- Monroe 49,467
- Novi, City of 56,780
- Plainfield Township 42,271
- Pontiac 63,776
- Portage 46,292
- Redford Township 49,504
- Rochester Hills 74,000
- Roseville, City of 47,299
- Royal Oak, City of 57,236
- Saginaw, City of 44,058
- Shelby Township 72,000
- Southfield 71,739
- St. Clair Shores, City of 59,715
- Sterling Heights, City of 127,000
- Taylor 63,409
- Troy 85,854
- Warren, City of 134,056
- Waterford Township 73,441
- West Bloomfield Township 49,479
- Westland 85,420
- Wyoming 76,501
- Ypsilanti Community Utility Authority 53,988
Why not "the state's water quality"? You drink from one utility, not a state. Rollups count systems, not people, so one large utility counts the same as a small one. Use the system pages for your actual water.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.