It’s time to cut back on water use. The Truckee Meadows Water Authority has had to supplement the Truckee River with water from Boca Reservoir, which itself is at about 15% capacity. TMWA says customer demands for water have been increasing with the hot, dry weather . Right now , without being supplemented,there’s not enough water in the Truckee River to keep treatment plants online. Currently 40% of the water in the Truckee River is coming from Boca Reservoir.The TMWA is asking residents to cut water use by at least 10 percent.