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Wausau Ground Water Contamination

Site Information
  • Wausau, WI (Marathon County)
  • EPA ID#WID980993521
  • Alias(es): Wausau Water Supply
Contact Information

Community Involvement Coordinator
Susan Pastor (pastor.susan@epa.gov)
312-353-1325 or 800-621-8431, ext. 31325

Remedial Project Manager
Sheri Bianchin (bianchin.sheri@epa.gov)
or 800-621-8431, ext. 4745


(where to view written records)

Marathon County Public Library
300 North First Street
Wausau, WI 54403


The Wausau groundwater site, located in the northern section of the city of Wausau, potentially affects six of the city’s production wells.   The wells provide drinking water for about 35,000 people on both sides of the Wisconsin River.

In 1982, three of the wells were found to be contaminated with high levels of volatile organic compounds, or VOCs. In 1984, a temporary carbon filter system was installed on one of the wells until two air strippers were installed. There are two sources associated with contamination. The first source is an old municipal landfill, located south of City Well Six on the Marathon Electric property along the west bank of the Wisconsin River. The second source is on the Wausau Chemical facility property, located southwest of City Well Three along the east bank of the river. Contaminated soil at both areas were treated and capped.

EPA’s cleanup included several extraction wells and treatment systems, two soil vapor extraction systems, a landfill cap, land and groundwater-use restrictions, and groundwater monitoring.

Site Updates | News Releases | Fact Sheets || Technical Documents || Legal Agreements || Public Meetings

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Site Updates

May 2015

EPA completed a review of the site's cleanup in April 2015. This type of review is required at least every five years where the cleanup is complete but hazardous waste remains managed on-site.  These reviews are done to ensure that the cleanup continues to protect people and the environment. 

The review included:

The review found that the cleanup continues to protect people and the environment, however, more information as to whether it is protective in the short-term won’t be available for about a year. In the long-term, follow-up actions such as land-use restrictions will be required.  The next scheduled review will be in 2020.

Legal Agreements

Technical Documents

Five Year Reviews

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