Welcome to the home page of the Main San Gabriel Basin Watermaster, an agency charged with administering adjudicated water rights and devoted to the management and protection of groundwater resources, within the watershed and groundwater basin known as the Main San Gabriel Groundwater Basin in Los Angeles County, California.

To learn more, please visit: www.thewatersthatconnectus.com 

Key Well Level

Historic Low:           169.4 ft.                        November 21, 2018

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Historic High:          295.30 ft.*                               July 20, 1983

Current Level:         200.8 ft.                    As of October 23, 2020
 
                                                  Since entry of judgment, 1973

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