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.
Some areas in the Sacramento region will have to reduce water use by 36 percent under proposed emergency drought rules from state water regulators. How urban suppliers will reach that goal varies. Enforcement is likely to increase everywhere.
(AP) - State regulators are ordering some farms to stop pumping from streams for the second year in a row.
As California enters the dry season, the latest U.S. Drought Monitor report shows one category expanding.
In spite of a California Appeals Court ruling, customers of private water suppliers may still have tiered rates based on usage, not on cost, and customers of private utilities may still see their rates go up.
California Governor Jerry Brown is calling on local water agencies to adjust their pricing structures as a way to promote conservation. But a state court ruling issued today could undermine those efforts.