Welcome to the Sierra Club - Wisconsin Chapter.
We are Wisconsin's voice for the nation's oldest, largest and most influential grassroots environmental organization. Our members include 18,000 of your friends and neighbors. Inspired by Wisconsin’s beautiful lakes, forests, rivers, and other natural features, we work together to protect our communities and the planet.
Looking to take action on the most pressing issues in Wisconsin?
Make a Difference for Wisconsin's Future!
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Local News and Information
MEA and Sierra Club File Lawsuit After State Regulators Abandon Required Environmental Review for Port Washington Data Center
July 10, 2026
Today, Midwest Environmental Advocates (MEA) filed a lawsuit on behalf of the Sierra Club challenging a Wisconsin Department of Natural Resources (DNR) decision to issue permits for a massive data center campus in Port Washington without fully...
Line 5 Reroute: Construction Concerns
July 9, 2026
Enbridge drilling error raises questions and concernsThe last week of June news broke that during construction of the Line 5 reroute Enbridge’s construction contractor, Michels, had a “frac out” near Vaughn Creek, on the east side of the route. A...
Invasive Reed Canary Grass Removal
June 29, 2026
What is invasive reed canary grass? Reed canary grass (Phalaris arundinacea, or “RCG”) is an aggressive, invasive plant that outcompetes and smothers native plants, thus creating monocultures that reduce biodiversity and wildlife...