San Leandro (Spanish for "St. Leander") is a city in Alameda County, California, United States. It is located in the East Bay of the San Francisco Bay Area; between Oakland to the northwest, and Ashland, Castro Valley, and Hayward to the southeast. The population was 91,008 as of the 2020 census. The San Leandro Hills run above the city to the northeast. In the lower elevations of the city, an upper regionally contained aquifer is located 50 to 100 feet (15 to 30 m) below the surface. At least one deeper aquifer exists approximately 250 feet (75 m) below the surface. Some salt water intrusion has taken place in the San Leandro Cone. Shallow groundwater generally flows to the west, from the foothills toward San Francisco Bay. Shallow groundwater is contaminated in many of the locales of the lower elevation of the city. Contamination by gasoline, volatile organic compounds and some heavy metals has been recorded in a number of these lower-elevation areas. More information...
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