Where does all of our water go? Ca water use data by category

According to the USGS, Californians withdrew an estimated total of 38 billion gallons of water per day in 2010 (the most recent data year of their study), compared with 46 billion gallons per day in 2005.

http://ca.water.usgs.gov/water_use/2010-california-water-use.html

  • Surface water withdrawals in California were 25 billion gallons per day (67%), compared with 35 billion gallons per day (76%) in 2005.
  • Groundwater withdrawals accounted for 13 billion gallons per day (33%), compared with 11 billion gallons per day (24%) in 2005.
  • About 82% of all California water withdrawals were from fresh-water sources, compared with 72% in 2005.
    • In both 2005 and 2010, about 74% of all fresh water withdrawals were for irrigation.
    • 95% of all saline water withdrawals were for thermoelectric power generation, compared with 98% in 2005.
    • 38 billion gallons of water withdrawals per day were distributed among 8 categories:

    • Irrigation: 60.7% (23,056 million gallons per day)
    • Thermoelectric power generation: 17.4% (6,601 million gallons per day)
    • Public supply: 16.6% (6,307 million gallons per day). Average daily gross per capita use was 181 gallons (total Public Supply withdrawals divided by population served).
    • Aquaculture: 2.6% (973 million gallons per day)
    • Industrial: 1.0% (400 million gallons per day)
    • Mining: 0.7% (272 million gallons per day)
    • Livestock: 0.5% (188 million gallons per day)
    • Self-supply domestic: 0.5% (172 million gallons per day). Average daily per capita use was 69 gallons.
    • The 58 counties in California use differing proportions of water sources in the 8 (or less) categories.