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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 generations to solve problems at their source.

• Early warning systems of water quality shifts

Join thousands of water guardians pushing back for change.

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'Thirty years ago, this river was polluted. Because we organized, the ecosystem breathes again. I watch the difference daily.' — Dr. Robert L.

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