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Recent Spill of Unknown Substance Into Mill Creek in Marshfield Doesn't Affect City's Drinking Water

Saturday, November 14th, 2026 -- 11:00 AM

UPDATE:

We understand that news of the recent spill into Mill Creek may raise questions about the safety of our community's drinking water. We want to reassure you that this incident does not affect the drinking water supply, according to Marshfield Utilities.

Here's why:
  • Our drinking water comes from groundwater wells, not Mill Creek or the City's storm sewer system.
  • Our water is tested daily at the points where it enters our distribution system to monitor water quality and help ensure it meets drinking water standards.
  • The reported spill involves contaminated surface water released into Mill Creek through the storm sewer system. It is separate from the groundwater sources Marshfield Utilities uses to provide drinking water.
The Utility will continue to monitor information regarding this incident and coordinate as appropriate.

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Original Story Below:

On Wednesday, November 11, 2026, the City of Marshfield was notified regarding a spill of an unknown substance originating from an unknown source/location, ultimately being released from the City of Marshfield's Storm Sewer System at the outfall to Mill Creek within Wildwood Park.

The area of the City that drains to this outfall includes the downtown, south of the CN railroad tracks - see the attached storm sewer map. This spill has released an unknown volume of contaminated water to the surface waters of Mill Creek. City staff are continuing to monitor the situation and work closely with the Wisconsin Department of Natural Resources regarding this release.

Due to the unknown nature of this spill/release, the City is requesting that anyone with information about this spill/release, including where it originated from, the substance spilled, how the spill occurred, who is responsible for the spill, etc., contact the City of Marshfield Public Works Department at (715) 486-2034

If there are questions related to this spill/release event, please also contact the Public Works Department at (715) 486-2034.

Feel free to contact us with questions and/or comments.