Tap Water Results

Is Ann Arbor, MI tap water safe?

Data: U.S. EPA · How we read the data · How we check it

Summary

No federal limits exceeded in EPA data for Ann Arbor Water System. 3 PFAS were detected below the limits.

7 public water systems serve parts of Ann Arbor. The largest, Ann Arbor Water System, serves 123,851 people. Your water bill names your system.

Largest system

Ann Arbor Water System

123,851 people · Surface water · EPA ID MI0000220

PFASHighest averageLimitStatus
PFOA
Not detected
–4 pptNot detected
PFOS
Not detected
–4 pptNot detected
PFHxS
Not detected
–10 pptNot detected
PFNA
Not detected
–10 pptNot detected
HFPO-DA (GenX)
Not detected
–10 pptNot detected

ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.

Lead: 2.3 ppb at the 90th percentile (Dec 2023, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0

Full Ann Arbor Water System results

Across Michigan, 5 of 311 water systems EPA tested had PFAS above a 2024 federal limit, and 26 systems were above the lead action level in results from the last five years. Michigan results.

Ann Arbor homes and lead pipes

63%
of homes built before 1980 (Michigan 62%, US 50%)
20%
built before 1950 (Michigan 22%)
55%
of households rent (Michigan 27%)

Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.

Housing: Census American Community Survey 2020–2024 5-year estimates for Ann Arbor city (tables B25034, B25003). Estimates for small places have a margin of error.

Other water systems serving Ann Arbor

  • Pittsfield Township Water System
    24,500 people · Purchased surface water · Michigan · lists this city
    No PFAS above limits
  • Scio Township Water System
    8,500 people · Purchased surface water · Michigan · lists this city
    No PFAS above limits
  • Loch Alpine Sanitary Authority
    1,506 people · Groundwater · Michigan · lists this city
    Not in EPA's PFAS sample
  • Ann Arbor Township Water System
    1,338 people · Purchased surface water · Michigan · lists this city
    Not in EPA's PFAS sample
  • Barton Hills Water System
    450 people · Groundwater · Michigan · lists this city
    Not in EPA's PFAS sample
  • Sisters of Mary, Mother of Eucharist Water System
    100 people · Groundwater · Michigan · lists this city
    Not in EPA's PFAS sample

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Canton charter 13 mi
Canton Township Water System
Canton Township Water SystemNone above limits0 ppb
Van Buren charter 13 mi
Huron Township Water System
Huron Township Water SystemNone above limits0 ppb
Northville 16 mi
Northville Township Water System
Northville Township Water SystemNone above limits0.9 ppb
Lyon charter 16 mi
Lyon Township Water System
Lyon Township Water SystemNone above limits2 ppb
Novi 19 mi
City of Novi
City of NoviNone above limits0 ppb
Livonia 20 mi
Livonia Water System
Livonia Water SystemNone above limits0 ppb
Ann Arbor ZIP codes (2)
  • 48104
  • 48109

Questions

Is Ann Arbor tap water safe to drink?

Ann Arbor Water System has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.

Who supplies water in Ann Arbor, MI?

7 public water systems serve parts of Ann Arbor. The largest is Ann Arbor Water System (123,851 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Ann Arbor tap water have PFAS?

Ann Arbor Water System had 3 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.

Do Ann Arbor homes have lead pipes?

Census estimates put 63% of Ann Arbor homes as built before 1980 (Michigan: 62%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Ann Arbor Water System's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.