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Hello and Welcome!
Main San Gabriel Basin Watermaster
Here, you can learn about the story, projects, and people who take care of the waters that connect us — our groundwater in the San Gabriel Valley within Los Angeles, California. Our aim with this website is to invite you into the story of the Main San Gabriel Basin and share how we are taking care of it every day.
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A Message From Us
In the San Gabriel Valley, 1.5 million people are connected to one source of water, our groundwater. Since 1973, we at the Main San Gabriel Basin Watermaster have administered this basin's water rights and managed and protected its water resources in all phases of our ongoing drought cycle. For our water, we are taking action together — with our partners and community members — because our groundwater is our common cause and common ground.
Morris Dam
Our Water Levels Now
Groundwater Levels
Groundwater levels change in response to demand and where we are in the drought cycle. We track our groundwater levels on a regular basis at a designated location called the ‘Key Well’. Our groundwater's historic high, low, and current levels are:
Historic High: 295.3 FT
Date: July 20, 1983
Historic Low: 169.4 FT
Date: November 21, 2018
Current Level: 247.6 FT
Date: July 11, 2025
Industry Updates
Check out the links below to stay up-to-date on relevant information related to our groundwater and how we manage it.
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