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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 scientists like you. Learn how you can join.

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

Every action counts — from small donations to big movements. We can still protect if we act together.

'Thirty years ago, this river was polluted. Thanks to this organization, native fish are returning. I work alongside their team.' — Professor Chen

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