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.
The drought can be blamed for a number of problems and the latest is a major decline in the duck population. A new survey shows lack of rain has led to poor habitats.
UPDATED: 6:45 p.m. - Containment has grown to 29 percent, and acreage burned to 17,622. Crews on the Washington Fire, three miles south of Markleeville, took advantage of light winds to increase containment.
California water regulators are again ordering some water rights holders to stop diverting water from rivers because of the drought. The order includes some rights for the city of San Francisco.
CAL FIRE increases staffing as the forecast of dry lightning and thunderstorms raises wildfire risk in northern California and western Nevada.
The Washington Fire has burned within about three miles of the small town of Markleeville in Alpine County. But crews have made protecting the community a priority.