Environment

Where is California water use decreasing?

Produced by Molly Peterson, Aaron Mendelson & Chris Keller | Updated July 1, 2015

Californians reduced their May water usage by 28.9 percent. The drop marks the greatest increase in month-to-month savings since Governor Jerry Brown called for residents to conserve water, according to data released by the state water board on Wednesday.

The increase in savings comes one month before the June reporting period, when mandatory conservation measures begin. Statewide, Californians must decrease their water use by 25 percent.

The South Coast Hydrologic Region reduced its May water usage by 25.7 percent.

Cooler weather may have helped the state achieve the May water savings. Average May temperatures statewide this year were 3.1 degrees cooler than in May 2013. The state also received nearly a quarter-inch more precipitation this May than in the comparison month.

Climate was even more helpful in the South Coast region, where average temperatures were 4.9 degrees cooler in May 2015 than in May 2013. Precipitation in the region also increased by .44 inches.

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About the data: These charts show the daily per capita residential water use rate in California as calculated by the State Water Resources Control Board. The charts cover the May 2015 reporting period, and are compared to the previous month unless specified. Since the per capita measure (which reflects gallons of water used per resident per day) does not take into account rainfall, temperature, humidity and population density, the State Water Resources Control Board discourages comparisons between water suppliers.

Central Coast

Daily per capita residential water use increased in May 2015 to an average of 72.54 gallons in the Central Coast hydrologic region. That number is compared to the April 2015 daily per capita residential water use of 71.54. Click here to see proposed reductions for this region. Use the chart below to see how the 29 agencies in this region performed.

Colorado River

Daily per capita residential water use decreased in May 2015 to an average of 157.32 gallons in the Colorado River hydrologic region. That number is compared to the April 2015 daily per capita residential water use of 158.46. Click here to see proposed reductions for this region. Use the chart below to see how the 15 agencies in this region performed.

North Coast

Daily per capita residential water use increased in May 2015 to an average of 63.90 gallons in the North Coast hydrologic region. That number is compared to the April 2015 daily per capita residential water use of 60.05. Click here to see proposed reductions for this region. Use the chart below to see how the 15 agencies in this region performed.

North Lahontan

Daily per capita residential water use increased in May 2015 to an average of 83.38 gallons in the North Lahontan hydrologic region. That number is compared to the April 2015 daily per capita residential water use of 66.29. Click here to see proposed reductions for this region. Use the chart below to see how the 5 agencies in this region performed.

Sacramento River

Daily per capita residential water use increased in May 2015 to an average of 117.83 gallons in the Sacramento River hydrologic region. That number is compared to the April 2015 daily per capita residential water use of 103.95. Click here to see proposed reductions for this region. Use the chart below to see how the 41 agencies in this region performed.

San Francisco Bay

Daily per capita residential water use increased in May 2015 to an average of 66.39 gallons in the San Francisco Bay hydrologic region. That number is compared to the April 2015 daily per capita residential water use of 65.43. Click here to see proposed reductions for this region. Use the chart below to see how the 46 agencies in this region performed.

San Joaquin River

Daily per capita residential water use increased in May 2015 to an average of 113.64 gallons in the San Joaquin River hydrologic region. That number is compared to the April 2015 daily per capita residential water use of 105.75. Click here to see proposed reductions for this region. Use the chart below to see how the 29 agencies in this region performed.

South Coast

Daily per capita residential water use decreased in May 2015 to an average of 80.95 gallons in the South Coast hydrologic region. That number is compared to the April 2015 daily per capita residential water use of 90.16. Click here to see proposed reductions for this region. Use the chart below to see how the 175 agencies in this region performed.

South Lahontan

Daily per capita residential water use increased in May 2015 to an average of 119.28 gallons in the South Lahontan hydrologic region. That number is compared to the April 2015 daily per capita residential water use of 113.91. Click here to see proposed reductions for this region. Use the chart below to see how the 17 agencies in this region performed.

Tulare Lake

Daily per capita residential water use increased in May 2015 to an average of 132.77 gallons in the Tulare Lake hydrologic region. That number is compared to the April 2015 daily per capita residential water use of 127.24. Click here to see proposed reductions for this region. Use the chart below to see how the 28 agencies in this region performed.

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