The Silver Lake Reservoir will be drained this summer as part of a Los Angeles Department of Water and Power project to build a new water pipeline beneath it.
The Los Angeles Times reports that the lost drinking-water storage is being replaced by a new underground reservoir near Griffith Park called Headworks. The open-air reservoir no longer meets federal standards for storing drinking water.
DWP director of engineering for water systems Susan Rowghani says crews will begin draining it toward the end of June or beginning of July. Portable units will treat the about 400 million gallons of water in the reservoir and put it back into the city's drinking-water system.
The Silver Lake Reservoirs was last drained in 2008 because the water was contaminated with bromate, a carcinogen.