The U.S. Environmental Protection Agency announced it will conduct comprehensive reviews of cleanup work at nine National Priorities List Superfund sites across Wisconsin this year.
Each site will undergo a five-year review to ensure that ongoing or completed remediation efforts continue to protect public health and the environment. Upon completion, a report for each site will be available online on the respective site's website.
"As required by the Superfund law, five-year reviews are a critical checkpoint to verify that completed cleanups are still doing their job—protecting people, drinking water, and ecosystems—and to course-correct if new data or site conditions warrant action. We will conduct these reviews transparently and share the results so residents can be assured that EPA is maintaining strong, science-based oversight," said EPA Region 5 Administrator Anne Vogel.
The agency listed the following sites for five-year reviews starting in 2026: N.W. Mauthe Co., Inc. (Appleton), Hunts Disposal Landfill (Caledonia), City Disposal Corp. Landfill (Dunn), Ripon City Landfill (Fond Du Lac County), Janesville Ash Beds (Janesville), Janesville Old Landfill (Janesville), Hagen Farm (Stoughton), Tomah Armory (Tomah), and Tomah Fairgrounds (Tomah). Web links provided by EPA include detailed information on each site's status, previous assessments, and cleanup activities.
Five-year reviews are generally required when hazardous substances remain on site above levels that permit unlimited use and unrestricted exposure. The process allows EPA to evaluate whether implemented remedies remain protective of human health and the environment. The agency retains responsibility for determining the protectiveness of each remedy. More information about these activities is available according to the official roster page.
