The mandatory reduction includes residents and businesses. Commercial water customers are required to reduce irrigation by 30 percent for landscaping. It also bans the washing of cars or boats without a nozzle, and prohibits the washing of outdoor surfaces unless necessary for health and safety.
Roseville says outdoor irrigation accounts for more than half of a typical home's water use, and says reducing that is the quickest way to reach the 20 percent goal.
The city gets most of its water from Folsom Lake, which is extremely low due to the drought. Earlier this year, the city turned on its groundwater wells in order to conserve water from the lake, but turned them off this month after more rain and snow fell in Northern California. The city of Sacramento has also implemented a mandatory 20 percent reduction.
While Roseville is calling the reduction "mandatory," water customers will not be hit with a surcharge or penalty if they do not meet that target.
Roseville, the largest city in Placer County, operates its own utility, which serves most of the 127,000 residents. Officials backtracked on a February proposal that would have used surcharges to compel reductions
Water conservationists criticized Roseville's approach, saying that without an enforcement or penalty structure, customers were unlikely to heed the call. But city leaders expect that education and outreach will translate into cutbacks.
The Associated Press contributed to this report.
California Communities Respond To Drought
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.
(AP) — Storms brought deep snow to the mountains that feed the vital Colorado River this season, but the dried-out landscape will soak up some of it before it can reach the river.
(AP) - California water managers say they're easing cutbacks as spring storms boost reservoirs in the state's five-year drought.