Peshtigo

## Summary

The municipal water system serving the City of Peshtigo tested clean under the EPA's fifth Unregulated Contaminant Monitoring Rule, with no PFAS compounds detected above the Minimum Reporting Level in any sample. That result, however, exists alongside a well-documented contamination history that has made Peshtigo a nationally recognized name in PFAS reporting. Beginning in the mid-2010s, PFAS contamination linked to fire-suppression foam training activities at a Tyco Fire Products (now Johnson Controls) facility was found in private drinking water wells in the unincorporated Town of Peshtigo, a separate jurisdiction from the city. Under a Wisconsin Department of Natural Resources enforcement action, Tyco has provided bottled water and point-of-entry treatment systems to affected households. The critical distinction for readers is this: the contamination story centers on private wells in rural areas surrounding the city, not on the Peshtigo Waterworks municipal supply.

## What the data shows

Peshtigo Waterworks (PWSID WI4380442), the municipal system serving approximately 3,400 city residents, was tested under UCMR 5, the EPA's most recent round of nationwide monitoring for emerging contaminants. Across all 29 PFAS compounds included in the UCMR 5 panel, every result came back as a non-detect, meaning no compound was found at or above the EPA Minimum Reporting Level in any sample collected. No compound approached the federal limit, and no compound was flagged for follow-up.

## What residents should know

Customers of Peshtigo Waterworks can take some reassurance from these results, but the UCMR 5 data covers only the municipal distribution system and says nothing about private wells in the surrounding Town of Peshtigo or elsewhere in Marinette County. Residents on private wells should not assume their water shares the municipal system's results; those households should contact the Wisconsin DNR or their county health department for guidance specific to their situation. City water customers who want the most current information, including any updates since UCMR 5 testing was completed, should contact Peshtigo Waterworks directly. Anyone with concerns about home filtration options can consult their utility or review filter guidance from a certified water quality resource.