May 5: Voters agree to form Contra Costa County Water District with a vote of 8,932 to 1,068.
May 9: CCCWD is incorporated
July 17: Ralph D. Bollman is elected to serve on the Board of Directors, and will continue to serve as president for 32 more years.
August 26: The federal Central Valley Project is to be carried out by the U.S. Bureau of Reclamation.
October 19: Construction starts on the first unit of the Central Valley Project, the Contra Costa Canal.
November 7: Groundbreaking ceremonies in Oakley marking the initial construction of the CVP.
July 8: The bureau pumps first water into the first 20 miles of the Canal.
August 18: Contra Costa Canal's first water delivered to the city of Pittsburg. A mammoth 3-day "Water Fiesta" is held in Pittsburg that includes numerous parades and a soap box derby race.
Contra Costa Canal Construction suspended due to WWII.
October 15: Contra Costa Canal construction resumes.
September 4: The entire 48-mile Contra Costa Canal is completed with dedication ceremonies held at Martinez Reservoir.
Voters in October approve $13.8 million general obligation bonds to purchase California Water Service Company's Contra Costa holdings.
February 17: CCWD purchases California Water Service Company's Central Costa County holdings for $12 million and immediately assumes responsibility for Central County drinking water.
June 2: Voters approve fluoridation for the treated water district.
November 5: Ground breaking ceremonies for Contra Loma Reservoir.
May 13: Ground breaking ceremonies for the Bollman Water Treatment Plant.
November 3: Dedication ceremonies held for Contra Loma Reservoir.
May 3: Bollman Plant produces first treated water.
February 17: District Center is dedicated in memory of Thomas Carlson, the attorney responsible for forming CCCWD.
Driest year in California history, CCWD and other Northern California water agencies ration water.
July: Fencing completed along the Contra Costa Canal.
November 18: Water district drops "county" from its name to be known as the Contra Costa Water District.
15-mile-long regional trail system along the Contra Costa Canal is completed.
May 6: CCWD celebrates 50th anniversary of incorporation.
November 8: Voters pass bond for funding of Los Vaqueros Reservoir Project.
CCWD's second water treatment plant, Randall-Bold, is completed in Oakley. The plant is jointly owned by CCWD and the Diablo Water District.
Ground is broken on the $450 million Los Vaqueros Reservoir Project, the first dam built in California in more than 15-years.
May 2: Dedication ceremony held for completion of Los Vaqueros Reservoir. The reservoir can store up to 100,00 acre-feet of water, ensuring high water quality for District customers.
The Bollman Water Treatment Plant is upgraded and now has a capacity of up to 75 million gallons of water per day.
September 9: Fishing access opened at Los Vaqueros Reservoir
A 21-mile, 42-inch diameter pipeline is completed to bring treated water from Randall-Bold Water Treatment Plant in Oakley to Central County.
62% of the District's voters approve the continuation of studies that could lead to the expansion of Los Vaqueros Reservoir.
Randall-Bold Water Treatment Plant is upgraded and now has a production capacity of up to 50 million gallons of water per day.
CCWD imposes drought restrictions on customers due to state-wide drought conditions, who respond by cutting water use by 20%.
July 20: The District's fourth intake -- the Middle River Intake -- is dedicated. It's located on Victoria Island, east of Discovery Bay.
CCWD begins enlarging Los Vaqueros Reservoir to a capacity of 160,000 acre-feet.
July 13: CCWD dedicates enlarged reservoir.
April 20: Los Vaqueros Marina hosts reopening celebration. Watch a video.
CCWD asks customers to voluntarily cut their water use to 15% of historic average due to state-wide drought conditions.
Driest year in California history. District asks customers to save 25 percent when compared to 2013 use. District customers respond and are among the thriftiest in the state, cutting use by 37 percent.
District rescinds drought restrictions.
Wettest year in state history, Los Vaqueros Reservoir is filled to its highest level ever, storing 156,000 acre-feet.
In fiscal year 2018, CCWD's renewable projects yielded a 17% reduction in greenhouse gas emissions from the previous year.
The Contra Costa Canal Transfer Act becomes law.
The Association of Metropolitan Water Agencies presented Contra Costa Water District with a 2020 Sustainable Water Utility Management Award, saying the agency is recognized as a statewide leader in water affairs with a focus on preserving Delta water quality and developing regional water supply reliability.
District calls for a voluntary 10% reduction in water use after two consecutive dry years.