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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.

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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.

• Early warning systems of water quality shifts

Join thousands of climate leaders fighting for justice.

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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 harm. Now I'm inspiring others.' — David T., Community Monitor

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