1852	Contra Costa Village, with a population approaching 2,000, is incorporated as the City of Oakland.
1870	Population of 15,000 served by several private water companies. The community is plagued by recurring droughts and lack of water storage. Anthony Chabot, who founded the Contra Costa Water Company in 1866, completes San Leandro Reservoir later to be renamed after him.
1890	Population increases to 47,000. A filter plant on San Leandro Reservoir begins operation.
1910	Population swells to 150,000 with more than 50,000 of the 100,000-plus refugees from the 1906 San Francisco Earthquake settling in the East Bay.
1919	San Pablo Reservoir completed by the East Bay Water Company (Inc. 1916).
1921	MUD Act adopted by the State of California.
1923	EBMUD is organized.
1926	Upper San Leandro Reservoir completed by the East Bay Water Co.
1928	Lafayette Reservoir completed.
1928	EBMUD purchases the East Bay Water Co.
1929	Pardee Dam, highest in the world at the time, and the Mokelumne aqueduct are completed. The first water deliveries from the Sierra Mountains to the East Bay occur June 23, 1929.
1930	Population of 460,000 served at 35 million gallons per day (MGD).  Pardee Reservoir filled for the first time.
1936	EBMUD sells 2,162 acres of watershed land to the East Bay Regional Park District for $656, 544. (Tilden Park, Roundtop and Lake Temescal)
1940	Population of 519,000 served at 44 MGD.
1949	Second Mokelumne Aqueduct completed.
1950	Population of 851,000 served at 109 MGD.
1951	Wastewater treatment system in operation.
1958	Pardee Reservoir opens to public recreation.
1960	Population of 978,000 served at 153 MGD.
1963	Third Mokelumne Aqueduct completed.
1964	Camanche and Briones reservoirs completed.
1966	Lafayette and Chabot reservoirs open to public for recreation.
1968	EBMUD signs agreement with the Bureau of Reclamation which opens to door for EBMUD to contract with the Bureau for 150,000 acre feet annually of American River water.
1970	Population of 1,100,000 served at 220 MGD.  Land use master plan adopted to protect watersheds.
1977	Driest year on record.
1980	Population of 1.1 million served at 184 MGD.
1983	Wettest year on record.
1988	Camanche Reservoir reaches lowest level since first filled.
1990	Population of 1.2 million served at 192 MGD.
1991	New administration building opens.
1993	Updated Water Supply Management Program adopted to guide water planning for the future.
1994	Seismic Improvement Program adopted to strengthen the water system over 10 years at a cost of $189 million.
1996	East Bay Watershed Master Plan adopted to protect biodiversity and water quality on 25,000 acres of EBMUD land.
1998	EBMUD converted from chlorine to chloramine as the water distribution system disinfectant to improve water taste and reduce unwanted disinfection byproducts.
1999	Wet Weather Program completed.
1999	$200 million in wastewater system revenue bonds authorized.
2001	$700 million in water system revenue bonds authorized.
2002	Completed upgrade of Mokelumne River Fish Hatchery
2003	EBMUD receives patent for safer biosolids (wastewater) processing
2004	Completed installation of 11-mile Southern Loop emergency pipeline
2004	Mokelumne Aqueducts flooded due to Jones Tract levee break
2005	EBMUD named to EPA Top 25 Green Power Partners list
2007	Claremont Tunnel seismic retrofit completed