San Joaquin County is a county located in Central Valley of the U.S. state of California, just east of the San Francisco Bay Area. As of the 2010 census, the population was 685,306. The county seat is Stockton. The City of San Joaquin, despite sharing its name with the county, is located in Fresno County, not San Joaquin County.
San Joaquin County was one of the original counties of California, created in 1850 at the time of statehood.
The county takes its name from the San Joaquin River. In the early 19th century Lieutenant Gabriel Moraga, commanding an expedition in the lower great California Central Valley, gave the name of San Joaquin (meaning Joachim) to the San Joaquin River that springs from the southern Sierra Nevada. San Joaquin County is also home to the site of the San Joaquin Valley's first permanent residence.
Between 1843 and 1846, during the era when California was a province of independent Mexico, five Mexican land grants were made in what became San Joaquin County: Campo de los Franceses, Pescadero (Grimes), Pescadero (Pico), Sanjon de los Moquelumnes and Thompson.
From 2007–present, the TV Show Sons of Anarchy takes place in San Joaquin County.
Tracy tire fire
On August 7, 1998, a tire fire ignited at S.F. Royster's Tire Disposal just south of Tracy on South MacArthur Drive, near Linne Rd. The tire dump held over 7 million illegally stored tires and was allowed to burn for over two years before it was extinguished. Allowing the fire to burn was considered to be a better way to avoid groundwater contamination than putting it out. The cleanup cost $16.2 million and wound up contaminating local groundwater anyway.