Seattle Public Utilities Water System Synopsis as of June 21, 2021 Cumulative Precipitation Snowpack (Snow Water Equivalent) Weighted Average Cedar/Tolt Weighted Average Cedar/Tolt 120 70 WY 2021 100 60 WY 2020 50 Median WY 1990 - 2019 80 40 60 30 Inches 40 WY 2021 Inches 20 WY 2020 20 Average WY 1990-2019 10 0 0 Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Precipitation was recorded in the Cedar River and South Fork Tolt The average snow accumulation across the sites that we monitor is River Watersheds over the past week. estimated to be about 3.4 inches snow water equivalent which is above the long term median for this time of the year. Combined Reservoir Storage Average 7-Day Water Consumption 50 300 275 WY 2021 40 250 225 WY 2020 200 Average WY 2010-2019 30 175 WY 2021 150 20 WY 2020 125 100 Average WY 1990-2019 75 10 50 Low Reservoir Conditions 25 Millions of GallonsMillionsDay ofper Billions ofofBillions Storage GallonsActive 0 0 Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep The combined reservoir storage of Chester Morse Lake, Masonry Water use over the past week averaged about 142 million gallons Pool, Lake Youngs and South Fork Tolt Reservoir is above the long per day (mgd), which is above the 140 mgd used during the same term average for this time of the year. period over the years 2010-2019. Note: WY = Water Year, which is defined as the 12-month period October 1, for any given year through September 30 of the following year. The water year is designated by the calendar year in which it ends. Thus, the year ending September 30, 2021 is called water year 2021 (WY 2021). Long-term water consumption data uses the most recent 10-years of data in order to better capture recent reductions in demand due to SPU’s conservation program efforts. All data is provisional and subject to revision..