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?
Check out our Action Center!
Make a Difference for Wisconsin's Future!
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Local News and Information
Dark Skies, Bright Future Program
July 24, 2026
From light pollution to warming night temperatures, the impact of the Sierra Club Wisconsin’s work stretches around the clock. Joins us online for a special online program July 29, as part of our Dark Skies, Bright Future fundraiser. We’ll take a...
Coexisting with Ecosystem Engineers
July 21, 2026
Wisconsinites have an opportunity to weigh in on the management of another beneficial keystone species in our state.
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...