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

Clean Wisconsin calls on PSC to reject appeal that would reopen data center tariff case

Clean Wisconsin is urging the Public Service Commission (PSC) to reject a recent petition to reopen its AI data center tariff case.

See News
Aerial view of the construction of data center complex, large AI center structure surrounded by cooling and power systems

Latest News

Expert Insights

6 steps for private well owners to keep their drinking water safe

If you think your well may be contaminated, here are some steps you should take to protect you and your family from the health risks associated with polluted drinking water.

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Expert Insights

Podcasts

Who’s Behind the Avalanche of AI Data Center Moratoriums?

What the rain and snow are telling about PFAS pollution in the Upper Midwest.

Listen Now
The Defender Episode 78: Who's Behind the Avalanche of AI Data Center Moratoriums?

Latest Podcast Episode

Health Briefs

PFAS and Health: Contamination in Private and Public Wells in Wisconsin

Once PFAS get into the environment or our bodies, they do not break down, and environmental contamination continues to build as more PFAS are introduced to the environment. Any exposure to PFAS can pose health risks.

View Health Brief

Pollution & Your Health

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