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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. Every contribution matters.

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

• Flood resilience for coastal protection

The water that flows through you connects you to 7 billion people — and billions more organisms. Join the fight.

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'I used to think my voice didn't matter. Then I joined a citizen monitoring program and realized — my action prevents contamination. Now I'm inspiring others.' — Jennifer M., Community Monitor

We believe that nature can heal if we remove barriers. Our decade of victories shows that change happens.