Forever Chemicals
If you served in Wisconsin or have spent your life here, you may simply want to understand the water you have been drinking. That is a fair thing to ask, and the grounding answer starts with the Wisconsin Department of Natural Resources, the DNR, which regulates public drinking water and set its own PFAS standards before the federal rule arrived. PFAS earn the nickname forever chemicals because they linger, which is exactly why this monitoring exists. The figures below summarize what testing across the state's larger systems has found. They describe systems, not your specific tap, and they are here to review calmly when evaluating an address.
EPA's UCMR 5 program (2021–2024) tested 53 public water systems in Wisconsin for 29 PFAS compounds; 6 reported at least one detection and none exceeded the 2024 federal limit of 4 ppt for PFOA/PFOS (a 11% detection rate). Detections vary by water system — check the utility serving a specific Wisconsin address.
Wisconsin is among the states that set their own enforceable PFAS drinking-water standards ahead of where the federal rule landed: the Wisconsin Department of Natural Resources (DNR) adopted state limits for PFOA and PFOS in public drinking water in 2022, working through its drinking-water program. The April 2024 federal rule (4 ppt for PFOA and PFOS) now sits alongside that state action. For residents, the meaningful detail is that one named agency, the DNR, has owned this issue across both water and the broader environment for years rather than waiting on Washington.
Numbers below come straight from EPA UCMR 5 monitoring (2021–2024). Every public water system in Wisconsinserving more than 3,300 people had to test for 29 different PFAS — here's what they reported.
53
Water systems tested
UCMR 5 (2021–2024)
6
Systems with any PFAS detected
11% detection rate
0
Systems exceeding 2024 MCL
Above 4 ppt PFOA/PFOS
5
Distinct PFAS compounds detected
Of 29 monitored under UCMR 5
0
TRI-reporting PFAS facilities
EPA Toxics Release Inventory 2024
0
DoD PFAS installations
Military PFAS contamination sites
These are the Wisconsinutilities where EPA testing found PFAS the most often or at the highest levels. Being on this list doesn't automatically mean today's tap water is unsafe — some systems have added treatment since these samples were taken — but it means a conversation with the utility is worth having before you move in.
| Water system | Detections | Max value (ng/L) | vs 2024 MCL |
|---|---|---|---|
| MONONA WATERWORKS | 5 | 0.01 | Below MCL |
| MADISON WATER UTILITY | 1 | 0.01 | Below MCL |
| MT HOREB WATERWORKS | 2 | 0 | Below MCL |
| STOUGHTON WATERWORKS | 1 | 0 | Below MCL |
| VERONA WATERWORKS | 1 | 0 | Below MCL |
| MCFARLAND WATERWORKS | 1 | 0 | Below MCL |
PFAS isn't one chemical — it's a family of thousands. Here are the specific compounds EPA picked up most often across Wisconsin water systems. PFOA and PFOS are the two with the strictest federal limits (4 parts per trillion).
Looking at a specific Wisconsincity? Each page below pulls the same federal data narrowed to that water system — useful whether you're relocating, buying, organizing your neighborhood around getting cleaner water, or just trying to find out what's in the tap and what's around you.
Read the figures above as a careful snapshot rather than the final word. Behind them is a federal monitoring effort that covers a defined set of PFAS compounds and only at public systems serving more than roughly 3,300 people, sampled between 2021 and 2024. The gaps are real: private wells and many small rural systems were never required to test, so quiet there is an open question, not reassurance, and the Wisconsin DNR offers well-testing guidance for exactly that situation. A detection from 2022 is also a moment in time, not necessarily today's tap. That Wisconsin set its own standards while the federal acronyms were still being sorted out is a small mercy for anyone tired of waiting on agency alphabet soup.
For veterans and military families, the relevant history is firefighting foam, AFFF, used for years at installations to fight fuel fires. The PFAS it carries can migrate into groundwater and persist long after the foam is gone. Where installations appear above, that marks where the public record has noted a connection worth understanding, not a verdict on your household or your service. The steady next step is the address-level report, which speaks to a specific property rather than the whole state.
Yes. EPA UCMR 5 monitoring (2021–2024) tested 53 public water systems in Wisconsin; 6 had at least one PFAS detection. Detections vary by water system — check your specific serving utility.
Yes, Wisconsin is among the states that acted ahead of the federal rule. The Wisconsin Department of Natural Resources adopted its own enforceable PFAS drinking-water standards for public systems in 2022. The April 2024 federal rule, with limits of 4 ppt for PFOA and PFOS and 10 ppt for PFHxS, PFNA, and GenX, now also applies, so systems work within both.
The Wisconsin Department of Natural Resources (DNR) handles PFAS across both drinking water and the broader environment. It set state drinking-water standards for PFOA and PFOS in 2022 and tends to address PFAS in groundwater and at contaminated sites as well, layering its own work alongside the federal limits.
The Wisconsin Department of Natural Resources, or DNR, is the state's lead environmental agency, overseeing air, water, land, and drinking-water programs. On PFAS it acted relatively early, which is why Wisconsin appears among the states with their own enforceable drinking-water standards.
Use VetMyAddress to see the PFAS detections reported for the public water system serving any Wisconsin address, alongside nearby military bases and industrial PFAS sources. The data comes from EPA UCMR 5, EPA TRI, and the DoD PFAS installation report.
In April 2024 the EPA set the first enforceable federal limits for PFAS in drinking water: 4 parts per trillion for PFOA and PFOS, and 10 ppt each for PFHxS, PFNA, and HFPO-DA (GenX), plus a Hazard Index for certain mixtures. Public water systems must complete initial monitoring by 2027 and come into compliance after that.
No. The federal limits apply to public water systems. Private well owners are responsible for their own testing and treatment, which is especially worth doing near a known PFAS source like a military base or industrial site.
State numbers tell you the pattern. An address report tells you what's actually in the water at yourkitchen sink — the matched utility, the PFAS detections on file, and every military or industrial source nearby. Whether it's for your family, your neighbors, or peace of mind.
Data sources: EPA UCMR 5 bulk data · EPA TRI 2024 · DoD PFAS installation report