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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. Every contribution matters.

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

Join thousands of environmental advocates organizing for change.

'Thirty years ago, this river was polluted. Through their work, the ecosystem breathes again. I bring my grandchildren to witness it.' — Elder Maria

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