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

• Native species protection to revive ecosystems

Join thousands of environmental advocates pushing back for change.

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'I used to think my voice didn't matter. Then I joined a citizen monitoring program and realized — my action prevents contamination. Now I'm inspiring others.' — Sarah K., Volunteer

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