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
Summer Wrap-Up: Protecting Forests, Line 5 Disasters, and No to Data Center Gas Plants
September 8, 2026
It’s been an incredible summer, with some highs and some lows. Read below for our summer recap. Thank you to all the incredible people who helped shape a progress-filled summer, from our in-office volunteers to our birddogging team members to our...
Clean Wisconsin, Sierra Club Take Legal Action to Defend Federal Air Pollution Safeguards
August 31, 2026
Clean Wisconsin, Sierra Club Take Legal Action to Defend Federal Air Pollution SafeguardsLast week, Clean Wisconsin and Sierra Club filed motions to intervene and for summarydisposition in a case at the U.S. Court of Appeals for the Seventh Circuit...
Enbridge’s Line 5 has another frac out as reroute challenge and intimidation concerns escalate
August 21, 2026
Another frac-out on Enbridge’s Line 5 reroute construction has been reported at Trout Brook in Marengo, Wisconsin. It is only the latest drilling spill to have occurred during reroute construction, following a 1,900 gallon spill earlier this summer...