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
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...
Wisconsinites say no to data center gas plants
August 12, 2026
This summer, the Public Service Commission (PSC, the agency that regulates electric and water utilities), held public input opportunities about two proposed methane gas plants, which are sometimes called "natural gas plants" by industry who want to...
Announcing: Thirsty Power: Coal and gas will leave us high and dry
July 30, 2026
A new report from the Sierra Club, Thirsty Power: Coal and gas will leave us high and dry analyzes Wisconsin’s current power generation, the water needed for that power, and the potential impacts on Wisconsin’s water as Big Tech tries to build more...