Marshfield residents concerned about a recent spill into Mill Creek are being told the city drinking water supply is not affected, according to Marshfield Utilities.
The city was notified on Wednesday, Nov. 11, 2026, about a spill of an unknown substance from an unknown source. The material was released from the city storm sewer system at its outfall to Mill Creek within Wildwood Park.
Utilities officials said drinking water in Marshfield comes from groundwater wells, not from Mill Creek or the storm sewer system. Water is tested daily at the points where it enters the distribution system.
The area draining to that outfall includes downtown Marshfield, south of the CN railroad tracks. City staff are continuing to monitor the situation and are working with the Wisconsin Department of Natural Resources on the release, which sent an unknown volume of contaminated water into Mill Creek.
Anyone with information about where the spill started, what substance was involved, how it happened or who is responsible is asked to contact the Marshfield Public Works Department at 715-486-2034.
