Answer to my own question:
The first year of commercial oil production in California was 1876.
California is the fourth largest oil-producing state in the United States.
During 2001, California’s crude-oil production totaled about 293.7 million barrels of oil, or about 800,000 barrels a day. This is about one-half of the state’s daily oil consumption.
About 48,507 oil and gas wells are currently producing in California.
The deepest active onshore oil well in California is 14,570 feet deep.
28 California counties produced oil and gas in 2001.
California has an estimated reserve of 3.4 billion barrels of recoverable crude oil.
Nearly eight times more water than oil is produced from California's oil and gas fields. In fact, the volume of water produced each year matches the freshwater needs of the City of San Francisco.
Since injection operations began in California in the 1940s, more than 70 billion barrels of produced water have been injected into oil and gas zones and other nonpotable aquifers without causing any known degradation of fresh waters.
Link:
http://www.consrv.ca.gov/DOG/helpFaq.htm