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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 community members 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 industries to rebuild what was lost.

• Emergency support for crisis zones

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

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'Thirty years ago, this river was forgotten. Because we organized, native fish are returning. I watch the difference daily.' — Dr. Robert L.

The science is clear: healthy water systems feed us, sustain us, and deserve our protection. We predict risks so policy can shift.