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.
Californians are exceeding Governor Jerry Brown's 25 percent conservation mandate.
(AP) - A group of nonprofit organizations and businesses has started a crowdfunding campaign to assist families affected by the state's drought and wildfires.
Extreme drought expanded in the Western U.S. and the drought is taking a toll on topsoil moisture in California.
(AP) - More people are drowning in two of Sacramento's rivers, and the drought may be partially responsible.
(AP) - State officials say strong water conservation figures for July show Californians are beginning to understand the dire need to cut back in a fourth year of drought.