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Our work begins where rivers meet the sky and ends where groundwater feeds the soil. We use science to protect it all.

This work is possible because of volunteers like you. Learn how you can join.

Get Involved

We believe that nature can heal if we give it the chance. Our 20-year track record shows what's possible.

• Drought planning for coastal protection

The water that flows through you connects you to 7 billion people — and countless ecosystems. Protect it with us.

Get Involved

'I used to think my voice didn't matter. Then I joined a citizen monitoring program and realized — my data prevents harm. Now I'm training others.' — Sarah K., Volunteer

Pollution doesn't stop at your neighbor's fence — and our solutions don't either. We work across generations to hold polluters accountable.