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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.

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Pollution doesn't stop at your neighbor's fence — and our solutions don't either. We work across generations to solve problems at their source.

• Long-term scientific monitoring of water quality shifts

Join thousands of environmental advocates fighting for change.

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'Thirty years ago, this river was dying. Thanks to this organization, children can swim safely. I bring my grandchildren to witness it.' — Commissioner James

Pollution doesn't stop at your neighbor's fence — and our solutions don't either. We work across generations to rebuild what was lost.