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
(AP) - The latest figures show Californians' water use is still on the rise since the state lifted mandatory conservation for the drought.
(AP) - President Barack Obama has signed a bill authorizing water projects across the country, including $170 million to address lead in the drinking water in Flint, Michigan, and $558 million to provide relief to drought-stricken California.
Rivers in the Sacramento area were reaching levels not seen in a decade on Thursday night.
California state agencies have released a long-term plan for water conservation. The proposal makes permanent some emergency water conservation measures already in place to deal with the state’s drought.
California regulators hear from residents and farmers concerned about a plan to provide more water for threatened fish in the San Joaquin River and its tributaries.