Although Southern California is not included in the state’s drought-emergency proclamation, Gov. Gavin Newsom Thursday urged residents across the state to voluntarily cut their water use by 15% amid worsening conditions across the West Coast.

He also called on businesses to slash their water use. According to the governor’s office, a 15% cut in water use would save 850,000 acre-feet of water — enough to supply more than 1.7 million households for a year.

Newsom said residents have responded to drought conditions before, and he was confident they would take steps again to ease their water use.