Wisconsin
Marinette
Good news: No PFAS detected above reporting limits in your water system.
- Population served
- 11K
- Systems tested
- 1
- Compounds detected
- 29
- Above federal limits
- 0
Source: EPA UCMR 5 · Samples collected 2023–2026
What was found in Marinette’s water
MARINETTE WATERWORKS
Serves 11K people · SW
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
About PFAS contamination in Marinette
## Summary
Marinette's municipal water system has earned an A grade, the highest possible rating, meaning the city's drinking water is currently meeting federal safety standards for PFAS contamination. Testing screened for 15 different PFAS compounds across the Marinette Waterworks system, and none were reported at concentrations that exceed any applicable federal limits. No compounds were found above the EPA's 10 parts per trillion threshold for regulated substances such as PFHxS, PFNA, and HFPO-DA. The contamination source in the area has been identified as Tyco/Johnson Controls manufacturing operations.
## What the data shows
Marinette Waterworks was tested for 15 PFAS compounds in total, including both federally regulated substances and compounds for which no federal limit has yet been established. Concentrations were not reported for any of the 15 compounds, indicating levels were either undetected or below reporting thresholds — a result that supports the A grade. Three of the tested compounds — PFHxS, PFNA, and HFPO-DA — carry an EPA limit of 10 parts per trillion, and none triggered a violation. The remaining 12 compounds currently have no federal limit set.
## What residents should know
Despite the strong grade, residents should be aware that the Tyco/Johnson Controls facility has been identified as a contamination source in the area, and ongoing monitoring remains important. A settlement with Tyco/Johnson Controls is currently providing funds to address contamination, and Marinette's system is paired with neighboring Peshtigo in that remediation effort. Residents are encouraged to contact Marinette Waterworks directly for the most current testing results and information about any future monitoring updates.
About this summary: Narrative text on this page was drafted by an AI model (claude-sonnet-4-6) from EPA UCMR 5 data and reviewed before publication. The numeric data above is reported by water utilities directly to the EPA. If you spot an error, email data@checkyourwater.org.
What Marinette residents can do
Marinette's water meets federal PFAS standards based on EPA UCMR 5 testing. To stay informed:
- Read your utility's annual Consumer Confidence Report (CCR) — request a copy if you don't receive one.
- Sign up for water quality alerts from your utility.
- If you're on a private well, get it independently tested for PFAS.
- Reduce PFAS exposure from non-water sources: avoid non-stick cookware, stain-resistant fabrics, and grease-resistant food packaging.
Primary contamination source: Tyco/Johnson Controls manufacturing
Settlement information: Tyco/Johnson Controls settlement funds flowing; paired with Peshtigo
How Marinette compares
Marinette is one of 2 communities we track in Wisconsin where PFAS levels exceed federal limits.
Where this data comes from
- Testing program: EPA Unregulated Contaminant Monitoring Rule, 5th cycle (UCMR 5)
- Testing period: 2023–2026
- Federal limits: EPA Maximum Contaminant Levels (MCLs) finalized April 2024
- Methodology: Read how we calculate grades
- Raw EPA data: EPA UCMR Occurrence Data
This data reflects EPA testing. Your water utility may have more recent results — contact them directly for the most current information.