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.
As the California drought worsens, more rodents are encroaching on homes and farms in search of water. Animal shelters are advertising feral cats as a 'green' pest control alternative to poisons or traps.
The City of Sacramento wants to create a groundwater master plan that would include drilling more wells.
At least seven large holes have appeared on the Sacramento State campus in recent days. The construction is part of a new special runoff filtration system.
The California Department of Water Resources released a video this week and suggested that the state faces a scary future and potential fifth year of drought.
Citrus growers in California's Central Valley say they expect to fallow between 7 and 9 percent of the state's 270,000 acres of citrus trees because of the drought.