Tap Water Results

Minnesota 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 →

10 Minnesota water systems serving 270,387 people had PFAS above a 2024 federal limit in EPA's final round of nationwide PFAS testing: 5% of the 197 Minnesota systems tested, compared with 11% nationally.

197
systems tested (serving 4.2 million people)
88
had at least one PFAS detected
10
had an average above a federal limit
270,387
people served by those systems

Highest PFOA or PFOS averages in Minnesota

  1. Hastings Water System Hastings · PFOA
    21.1 ppt
  2. Waite Park Water System Waite Park · PFOS
    16.5 ppt
  3. Woodbury Water System Woodbury · PFOA
    12.8 ppt
  4. Lake Elmo Water System Lake Elmo · PFOA
    10.6 ppt
  5. Brooklyn Park Water System Brooklyn Park · PFOA
    10.1 ppt
  6. Sauk Rapids Water System Sauk Rapids · PFOS
    9.45 ppt
  7. Cloquet Water System Cloquet · PFOS
    8.1 ppt
  8. Stillwater Stillwater · PFOS
    7.55 ppt
  9. Newport Water System Newport · PFOA
    6.2 ppt
  10. Becker Water System Becker · PFOS
    4.55 ppt
  11. South Saint Paul Water System South St. Paul · PFOA
    3.8 ppt
  12. Brooklyn Center Water System Brooklyn Center · PFOS
    3 ppt
  13. Princeton Water System Princeton · PFOS
    2.45 ppt
  14. White Bear Township Water System White Bear Lake · PFOA
    2.3 ppt
  15. Alexandria Water System Alexandria · PFOS
    2.2 ppt
The 15 Minnesota 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
Hastings Water System · Hastings · PFOA21.1
Waite Park Water System · Waite Park · PFOS16.5
Woodbury Water System · Woodbury · PFOA12.8
Lake Elmo Water System · Lake Elmo · PFOA10.6
Brooklyn Park Water System · Brooklyn Park · PFOA10.1
Sauk Rapids Water System · Sauk Rapids · PFOS9.45
Cloquet Water System · Cloquet · PFOS8.1
Stillwater · Stillwater · PFOS7.55
Newport Water System · Newport · PFOA6.2
Becker Water System · Becker · PFOS4.55
South Saint Paul Water System · South St. Paul · PFOA3.8
Brooklyn Center Water System · Brooklyn Center · PFOS3
Princeton Water System · Princeton · PFOS2.45
White Bear Township Water System · White Bear Lake · PFOA2.3
Alexandria Water System · Alexandria · PFOS2.2

Largest systems above a limit

#SystemPeople servedAbove the limit forPFOA avgPFOS avg
1Brooklyn Park Water System
Brooklyn Park
Above: PFOA, PFOS
89,995PFOA, PFOS10.1 ppt9.45 ppt
2Woodbury Water System
Woodbury
Above: PFOA, PFOS, PFHxS, Hazard Index
82,643PFOA, PFOS, PFHxS, Hazard Index12.8 ppt4.85 ppt
3Hastings Water System
Hastings
Above: PFOA, PFOS
23,222PFOA, PFOS21.1 ppt4.55 ppt
4Stillwater
Stillwater
Above: PFOS
19,462PFOS2 ppt7.55 ppt
5Sauk Rapids Water System
Sauk Rapids
Above: PFOA, PFOS, PFHxS, Hazard Index
13,835PFOA, PFOS, PFHxS, Hazard Index6.55 ppt9.45 ppt
6Cloquet Water System
Cloquet
Above: PFOS
12,864PFOS–8.1 ppt
7Lake Elmo Water System
Lake Elmo
Above: PFOA
10,978PFOA10.6 ppt–
8Waite Park Water System
Waite Park
Above: PFOA, PFOS, PFHxS, Hazard Index
8,354PFOA, PFOS, PFHxS, Hazard Index5.45 ppt16.5 ppt
9Becker Water System
Becker
Above: PFOS
5,034PFOS2.15 ppt4.55 ppt
10Newport Water System
Newport
Above: PFOA
4,000PFOA6.2 ppt–

Which limits were exceeded

PFASFederal limitSystems above itPeople served
PFOA
233,027 people
4 ppt7233,027
PFOS
255,409 people
4 ppt8255,409
PFHxS
104,832 people
10 ppt3104,832
PFNA10 ppt00
GenX (HFPO-DA)10 ppt00
Hazard Index
104,832 people
13104,832

"–" 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.

Minnesota has its own PFAS rules. Lowest MDH values (PFOA cancer-based, noncancer 0.24). For PFHxS, MDH recommends EPA's 10 ng/L over its 47 ng/L HRL (June 2025). Details. This report compares results with the federal limits only.

Data and how to cite it

Suggested citation:

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

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 Minnesota water systems have PFAS above the limit?

10 of the 197 Minnesota community water systems EPA tested in 2023–2025 (5%) had at least one entry-point average above a 2024 federal PFAS limit. They serve 270,387 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 Minnesota 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.