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.
(AP) - The latest figures show Californians' water use is still on the rise since the state lifted mandatory conservation for the drought.
(AP) - President Barack Obama has signed a bill authorizing water projects across the country, including $170 million to address lead in the drinking water in Flint, Michigan, and $558 million to provide relief to drought-stricken California.
Rivers in the Sacramento area were reaching levels not seen in a decade on Thursday night.
California state agencies have released a long-term plan for water conservation. The proposal makes permanent some emergency water conservation measures already in place to deal with the state’s drought.
California regulators hear from residents and farmers concerned about a plan to provide more water for threatened fish in the San Joaquin River and its tributaries.