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 minor improvement in California drought conditions last week, but long-term drought remains entrenched as the summer dry season is slightly more than a month away.
Outdoor burn permits are now required for most counties in Northern California.
Spring storms help Sierra Nevada snowpack, but there is no reduction in drought conditions in California and Nevada.
More "Spare The Air" alerts may be issued this year in the Sacramento region because the Environmental Protection Agency has lowered the federal ozone health standard.
Weather permitting, the Tahoe Douglas Fire Protection District and the U.S. Forest Service may continue prescribed fire operations starting Monday in areas around Lake Tahoe.