Action Alert: 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

Thousands sign petition to pause AI data center approvals in Wisconsin

Petition calls for a comprehensive state plan to ensure AI data center development will not harm communities

See News

Latest News

Expert Insights

Clean Wisconsin expands advocacy work in Washington

With so many new anti-environmental policy shifts happening at the federal level, it is more vital than ever that Wisconsinites have an environmental advocate in Washington, D.C.

Read More

Expert Insights

Podcasts

What to know about PFAS pesticides

A look what could soon be sprayed on food and farm fields across Wisconsin.

Listen Now
Defender Episode 62: What to know about PFAS Pesticides

Latest Podcast Episode

Health Briefs

Neonicotinoids and Human Health

Previously thought to pose no risk to humans, there is increasing evidence that neonicotinoids may have harmful health effects.

View Health Brief

Pollution & Your Health

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