Stop unchecked data center development

Healthier Future for Wisconsin

ABOUT CLEAN WISCONSIN

Bold Action for a
Cleaner Wisconsin

Your Environmental Voice Since 1970

Since 1970, we’ve defended Wisconsin’s air, water, and land with bold action. From landmark legal wins to groundbreaking research, we turn environmental challenges into lasting progress.

Our Mission: Clean Wisconsin works to combat climate change and pollution in our air, water and land to ensure a healthy future for every Wisconsin community.

Our Accomplishments

A Legacy of Environmental Victory

Real progress, real impact. From cleaner air to safer water, we’re making Wisconsin a healthier place to live—one victory at a time.

Explore Key Victories
3

foundational cases that established the right to sue for the environment.
40

percent reduction in Mercury emissions from WI power plants
20

percent of the Earth ‘ s freshwater resources protected through the Great Lakes Compact
6

gigawatts of clean wind and solar energy approved in Wisconsin.

Our Approach

Science & Analysis

We’re not just advocates—we’re experts. As the only environmental group in Wisconsin with a dedicated science team, we have the knowledge and credibility to fight smarter and win bigger. Backed by research and legal expertise, we turn advocacy into impact.

Leading with Science

Our Approach

Legal Action

For decades our legal team has fought and won high-impact cases to protect Wisconsin’s air, water, and natural places—from curbing agricultural runoff to challenging weak air pollution permits. When policy fails, we use the power of the courts to defend the environment and public health.

Defending Wisconsin’s Environment

Our Approach

Policy Advocacy

We work with lawmakers, agencies, and communities to advance environmental policies that protect Wisconsin’s air, water, land, and climate—guided by science and driven by our shared vision for a clean Wisconsin.

Shaping Policy

Our Approach

Community Engagement

From severe storms to smoke-filled skies, climate change is already affecting communities across Wisconsin. Clean Wisconsin partners with local governments and community organizations to prepare for extreme weather, reduce pollution, and build long-term resilience—starting with the people most impacted.

Community Engagement in Action

Our Approach

Amplifying Your Voice

Real change starts with people who speak up. Clean Wisconsin helps people across the state take meaningful action—whether it’s contacting legislators, attending hearings, or organizing in their communities to protect our air, water, and climate.

Amplifying Your Voice

Meet the Team

The Experts Behind the Advocacy

It takes more than passion to protect Wisconsin’s environment—it takes knowledge, strategy, and experience. Our team of scientists, attorneys, policy experts, and advocates works every day to defend our state’s air, water, and land.

Meet the Entire Team

STAY INFORMED

Updates from the Front Lines

Press Releases

Line 5 accident causes release of freshwater in Wisconsin’s Northwoods

“We are seeing in real time the risk our state bears so Enbridge can use our Northwoods as a pass through for its pipeline.”

See News
Line 5 accident site. Photo: Devon Cupery

Latest News

Expert Insights

Our vision of a data center policy framework

Wisconsin doesn’t need data centers; data centers need Wisconsin. If tech companies want to build and operate data centers in Wisconsin, they need to be good neighbors.

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Expert Insights

Podcasts

Why You Should Be Hyped About Hazelnuts!

In this episode Amy heads out to Sheboygan County to find out why farmers and environmental advocates are so excited about Wisconsin’s hazelnuts.

Listen Now
The Defender Podcast Episode 89: Why You Should Be Hyped About Hazelnuts

Latest Podcast Episode

Health Briefs

How does contaminated sediment affect our health?

Pollutants in lake, river, and stream sediment enter aquatic food webs and accumulate in fish, contributing to Wisconsin’s fish consumption advisories to protect against unsafe exposure to contaminants like mercury, PCBs, and PFAS.

View Health Brief

Pollution & Your Health

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