The Sacramento Bee reported Thursday that the San Juan Water District board of directors approved the move this week.
The district serves more than 265,000 people in the Sacramento suburbs, including the communities of Citrus Heights, Orangevale and Folsom.
Most of its water comes from Folsom Reservoir, which the newspaper says has shrunk perilously low amid one of the driest winters in California history.
District General Manager Shauna Lorance says the call for conservation is not mandatory, but it could become so next month if the area doesn't get rain soon.
The district also is extending a request for a 20 percent cut in all water use that has been in place for months.
A University of the Pacific economic forecast shows that drought has had a "relatively mild" impact on California's economy.
Another water district in Sacramento County is offering cash rebates for customers to remove grass.
NOAA’s Climate Prediction Center and meteorologists in other countries show that strong-to-moderate El Niño conditions are present in the tropical Pacific. But it won't end the drought in California.
Stream fishing around Lake Tahoe and western Nevada is struggling because of the drought. But fishing may actually be better at the lake itself.
The U.S. Forest Service has wrapped up its hiring for firefighters to work on California's 18 national forests this summer.