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.
Californians fell short of their monthly mandatory water conservation goals for the first time in October. Regulators say the state is still on course to meet to meet its overall target.
Fire agencies are planning to begin prescribed fire operations Monday in the Lake Tahoe Basin. There are at least 10 prescribed burn projects scheduled.
A movement around the U.S. encourages people to skip the shopping malls Friday and spend time in nature. Some national parks and state parks in California are waiving entry fees.
The latest U.S. Drought Monitor showed no change to drought conditions in California over the past week. But, the report does not include the storm that brought rain to valleys and snow to the Sierra Nevada this week.
Two million Sacramento-area water users conserved 27 percent in October, the same rate as September.