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 visiit www.thewatersthatconnectus.com
Key Well Level
Historic Low: 169.4 ft. November 21, 2018
Historic High: 295.30 ft.* July 20, 1983
Current Level: 231.9 ft. As of May 26, 2023
Since entry of judgment, 1973
Designee to Receive Future Notices for Defendant BofA N.A. Trusteeof the William Knight Living Trust
February 21, 2019
SAN GABRIEL VALLEY BENEFITS FROM SEASON'S RAINFALL, BUT GROUNDWATER LEVELS REMAIN EXTREMELY LOW.
After a multi-year drought, and low rainfall totals in 8 of the past 10 years, rainfall in the San Gabriel Valley has been trending above average this winter. READ FULL NEWS RELEASE
Snowcapped mountains are pretty typical in California — just not the peaks that got a dusting this week.
A series of storms has brought a rare wet winter to the state, sending snow levels plunging and creating some surreal scenes Californians won’t soon forget: a blanket of white covering vineyards in Napa Valley. Plows clearing California 17 between Santa Cruz and San Jose. Peaks in the San Francisco Bay Area with an alpine feel. Even San Francisco’s Twin Peaks got some snow.
How L.A. went from bone-dry to sopping wet "For instance, the Key Well level at the Main San Gabriel Groundwater Basin in Los Angeles County dropped to a historic low of 172.2 feet in October. The historic high was more than 295 feet, achieved in 1983 after one of the wettest winters in recorded California history.
The U.S. Drought Monitor recently revised its map to show no signs of drought conditions in Northern California because of recent rains. The map has been criticized by some experts for oversimplifying the situation in California who say weekly changes in weather patterns don’t mean the drought is over.“
May 11, 2016
On May 11, 2016 the Board held a hearing to review the preliminary Operating Safe Yield recommendation given by its staff engineer on 4/6/16 and to receive any public comments. There being none, and the staff engineer's recommendation not having changed, the Board moved to approve the Final Determination of the Operating Safe Yield: 150,000 AF for fiscal year 2016-2017. 130,000 AF each subsequent year for fiscal years 2017-18, 2018-19, 2019-20, 2020-21.
UPDATE: State Water Project Allocation Set: 60%
April 21, 2016
On April 21, 2016, the California Department of Water Resources announced to all State Water Project Contractors that the initial 2016 SWP allocation of 10% would now be increased to 60%. Download the Notice for more informaiton.
April 6, 2016
The Board received the following preliminary Operating Safe Yield recommendation from its staff engineer: 150,000 AF for fiscal year 2016-2017. 130,000 AF each subsequent year for fiscal years 2017-18, 2018-19, 2019-20, 2020-21.
March 1, 2016
Download the most recent draft of the San Gabriel Basin Salt and Nutrient Management Plan.
February 23, 2016
Letter from Executive Officer, Anthony Zampiello, to all Parties to the Watermaster Judgment addressing questions regarding the 2014 Sustainable Groundwater Management Act.
Watermaster 2014-15 Annual Report
October 30, 2015
Preliminary Operating Safe Yield 2015-16: 150,000 AF
April 1, 2015
The Board received the following preliminary Operating Safe Yield recommendation from its staff engineer: 150,000 AF for fiscal year 2015-2016. 130,000 AF each subsequent year for fiscal years 2016-17, 2017-18, 2018-19, 2019-20.
Key Well Hits Historic Low
On June 13, 2014, the Baldwin Park Key Well hit surpassed the previous historic low of 189.2 ft and continues to fall