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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 donations 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 hold polluters accountable.

• Long-term scientific monitoring of water quality shifts

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, the ecosystem breathes again. I bring my grandchildren to witness it.' — Dr. Robert L.

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