Tap Water Results

Michigan PFAS results from EPA's final data

Report published Nov 14, 2026 · EPA UCMR 5 final data file of Oct 15, 2026 (samples collected 2023–2025) · Method · National results →

5 Michigan water systems serving 219,330 people had PFAS above a 2024 federal limit in EPA's final round of nationwide PFAS testing: 2% of the 311 Michigan systems tested, compared with 11% nationally.

311
systems tested (serving 6.8 million people)
43
had at least one PFAS detected
5
had an average above a federal limit
219,330
people served by those systems

Highest PFOA or PFOS averages in Michigan

  1. Independence Township Water System Independence charter · PFOS
    9.7 ppt
  2. Dundee Water System Dundee · PFOA
    8.22 ppt
  3. Gladstone Water System Gladstone · PFOS
    7.47 ppt
  4. Kalamazoo Water System Kalamazoo · PFOS
    6.55 ppt
  5. Fremont Water System Fremont · PFOA
    4.6 ppt
  6. Otsego Water System Otsego · PFOA
    2 ppt
  7. Spring Lake Township Water System Spring Lake · PFOA
    1.2 ppt
  8. Grand Haven Water System Grand Haven · PFOA
    1.18 ppt
The 8 Michigan systems with the highest PFOA or PFOS entry-point average (whichever is higher) in EPA's 2023–2025 testing, in parts per trillion.
Chart data as a table
Systemppt
Independence Township Water System · Independence charter · PFOS9.7
Dundee Water System · Dundee · PFOA8.22
Gladstone Water System · Gladstone · PFOS7.47
Kalamazoo Water System · Kalamazoo · PFOS6.55
Fremont Water System · Fremont · PFOA4.6
Otsego Water System · Otsego · PFOA2
Spring Lake Township Water System · Spring Lake · PFOA1.2
Grand Haven Water System · Grand Haven · PFOA1.18

Largest systems above a limit

#SystemPeople servedAbove the limit forPFOA avgPFOS avg
1Kalamazoo Water System
Kalamazoo
Above: PFOS
192,992PFOS2 ppt6.55 ppt
2Independence Township Water System
Independence charter
Above: PFOA, PFOS, PFHxS, Hazard Index
11,790PFOA, PFOS, PFHxS, Hazard Index5.95 ppt9.7 ppt
3Dundee Water System
Dundee
Above: PFOA
5,400PFOA8.22 ppt–
4Gladstone Water System
Gladstone
Above: PFOS
4,632PFOS–7.47 ppt
5Fremont Water System
Fremont
Above: PFOA
4,516PFOA4.6 ppt–

Which limits were exceeded

PFASFederal limitSystems above itPeople served
PFOA
21,706 people
4 ppt321,706
PFOS
209,414 people
4 ppt3209,414
PFHxS
11,790 people
10 ppt111,790
PFNA10 ppt00
GenX (HFPO-DA)10 ppt00
Hazard Index
11,790 people
1111,790

"–" in the table above means not detected. A system can be above more than one limit. EPA proposed in May 2026 to rescind the PFHxS, PFNA, GenX and Hazard Index limits. That proposal is not final.

Michigan has its own PFAS rules. EGLE promulgated MCLs for seven PFAS in August 2020 under the state Safe Drinking Water Act. Details. This report compares results with the federal limits only.

Data and how to cite it

Suggested citation:

Tap Water Results, "Michigan PFAS results from EPA's final UCMR 5 data" (published Nov 14, 2026, EPA data file of Oct 15, 2026). https://tapwaterresults.com/pfas/michigan/

You're welcome to quote and republish these figures with a link back. Questions from reporters: see contact.

Method

For each system we average each entry point's UCMR 5 results (non-detects count as zero, complete sets of samples only) and compare the highest entry-point average with the 2024 federal limit, using EPA's rounding. This is how EPA compares UCMR 5 results to the limits in its own data summary, and our national counts match EPA's published table within 2% (how we check). Results are monitoring data from 2023–2025, not compliance determinations, and treatment installed since then is not reflected. Full method.

Questions

How many Michigan water systems have PFAS above the limit?

5 of the 311 Michigan community water systems EPA tested in 2023–2025 (2%) had at least one entry-point average above a 2024 federal PFAS limit. They serve 219,330 people. Nationally the share is 11%.

Are these systems violating the law?

Not yet. Systems have until 2029 to meet the 2024 limits, and EPA has proposed moving the PFOA and PFOS deadline to 2031 and rescinding the other limits. EPA's UCMR 5 results are monitoring data and do not determine compliance.

Which systems were tested?

EPA's UCMR 5 tested every community water system serving more than 3,300 people and a representative sample of smaller ones. Systems that were not tested have no federal result, which is not the same as having no PFAS.

All Michigan water systems → · National results → · PFAS results for every state →

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