Water Quality: Ann Arbor, MI
10 water systems • 279,046 people served
Some ConcernsWater Quality Summary
Ann Arbor is served by 10 public water systems with a combined service population of 279,046 people, and has 58 EPA Safe Drinking Water Act violations on record. Critically, 2 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Ann Arbor's violation count is 115% above the national average for Michigan. Contaminants associated with violations include E. coli.
Contaminants Found
Causes gastrointestinal illness; certain strains (e.g., O157:H7) can cause severe kidney failure and death.
Common source: Fecal contamination from humans or animals entering the water supply
EPA limit: Zero (no E. coli permitted in drinking water)
Water Systems Serving Ann Arbor
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| ANN ARBOR | MI0000220 | Surface Water | 241,868 | 2 |
| PITTSFIELD TOWNSHIP | MI0005360 | Surface Water | 24,500 | 19 |
| SCIO TOWNSHIP | MI0005977 | Surface Water | 8,500 | 9 |
| LOCH ALPINE SANITARY AUTHORITY | MI0003940 | Groundwater | 1,506 | 6 |
| ANN ARBOR TOWNSHIP | MI0000221 | Surface Water | 1,338 | 5 |
| BARTON HILLS | MI0000430 | Groundwater | 450 | 3 |
| SALINE VALLEY FARMS | MI0005901 | Groundwater | 375 | 5 |
| WHITMORE LAKE APARTMENTS | MI0007101 | Groundwater | 281 | 3 |
| COPPER MEADOWS | MI0001631 | Groundwater | 128 | 4 |
| SISTERS OF MARY, MOTHER OF EUCHARIST | MI0006074 | Groundwater | 100 | 2 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in Michigan
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.