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About Us

The Council for Watershed Health (CWH) is a 501(c)3 non-profit organization founded 20 years ago by environmental advocate Dorothy Green. Our mission is to advance the health and sustainability of our region's watersheds, rivers, streams and habitat - both in natural areas and urban neighborhoods. We do this through science-based research, education and inclusive stakeholder engagement. Our 2025 Vision is for a Los Angeles region that is a model of sustainable, urban watershed management. The region's watersheds are managed to promote ecological, social, and economic health, with clean waters, reliable local water supplies, restored native habitats, ample parks and open spaces, integrated flood management and revitalized rivers and urban centers. 

What is a Watershed?


No matter where you live and how much or how little water is nearby, you live in a watershed.


A watershed is simply the land where water flows on its way to a common stream, river, or lake. A watershed can be very large (e.g. draining thousands of square miles to a lake or the ocean), or very small that drains to a pond. A watershed that nests inside of a larger watershed is a subwatershed. EPA

You can learn more about the health of your watershed by visiting the EPA's How is My Waterway.

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