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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 volunteers like you. Together we can turn the tide.

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We believe that nature can heal if we give it the chance. Our 20-year track record shows what's possible.

• Real-time data networks of water quality shifts

Join thousands of climate leaders fighting for justice.

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'Thirty years ago, this river was polluted. Thanks to this organization, 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 predict risks so communities can act.