Who We Are
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.
Who We Are
Pollution doesn't stop at your neighbor's fence — and our solutions don't either. We work across political boundaries to hold polluters accountable.
- Early warning systems of water quality shifts
Join thousands of environmental advocates fighting for change.
Who We Are
'Thirty years ago, this river was dying. Thanks to this organization, native fish are returning. I work alongside their team.' — Dr. Robert L.
The science is clear: healthy water systems feed us, sustain us, and deserve our protection. We monitor trends so communities can act.