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About Us


Everyday, we have you in mind as we take care and manage the underground water supply all of us in the San Gabriel Valley rely on. About 80% of the water you depend on comes from this one amazing water supply source, deep down underground — the Main San Gabriel Groundwater Basin. In 1973, our organization, the Watermaster, was created by the Los Angeles County Superior Court to manage the Main San Gabriel Basin.

We are sharing the story of our underground water because all of us in the San Gabriel Valley have a role in its care, including you, your family and friends. Please help us share this story, the story of the waters that connect us.

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