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Tap water quality report

Ann Arbor, MI

EPA monitoring detected 5 contaminants across the 9 water suppliers serving Ann Arbor. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

9
water suppliers
160,748
people served
5
contaminants found
Michigan rankings Lead in Michigan PFAS in Michigan

What was found in Ann Arbor's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Lead
0.0072 mg/L 48%
of the EPA limit 0.0150 mg/L
 9/9 LCR
Pfba
0.0061 µg/L
No EPA limit set
 1/9 UCMR-5
Pfpea
0.0049 µg/L
No EPA limit set
 2/9 UCMR-5
Pfhpa
0.0042 µg/L
No EPA limit set
 1/9 UCMR-5
Pfhxa
0.0036 µg/L
No EPA limit set
 2/9 UCMR-5
Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Ann Arbor

SupplierPopulation served
ANN ARBOR 123,851
PITTSFIELD TOWNSHIP 24,500
SCIO TOWNSHIP 8,500
LOCH ALPINE SANITARY AUTHORITY 1,506
ANN ARBOR TOWNSHIP 1,338
BARTON HILLS 450
SALINE VALLEY FARMS 375
COPPER MEADOWS 128
SISTERS OF MARY, MOTHER OF EUCHARIST 100

Frequently asked questions about Ann Arbor tap water

Is Ann Arbor tap water safe to drink?

EPA testing detected 5 contaminants in the water serving Ann Arbor. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Ann Arbor?

9 public water suppliers report drinking-water monitoring for Ann Arbor, Michigan to the EPA. Each is listed above with its population served.

What contaminants are in Ann Arbor's water?

The contaminants EPA monitoring detected in Ann Arbor include Lead, Pfba, Pfpea, Pfhpa, Pfhxa. The full list, with the highest level found and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.