Algae bloom ruled out as cause of Silver Lake Reservoir’s green water

Photo by Dan Gershon


Silver Lake  – Why did the water in  the Silver Lake Reservoir suddenly turn from Tahoe blue to Biscayne Bay green? At least it’s not an algae bloom, according to the Los Angeles Department of Water and Power, which has been testing the water.

“At present, the levels of algae we are seeing are not uncommon and would not be expected to have any adverse effects on wildlife or the ecosystem,” according to a statement from Ellen Cheng, media relations manager with the DWP.

Beyond that, however, the cause is still unknown. Cheng notes, however, that water can change color in the warmer months.

“Natural lakes and raw water reservoirs can typically change color, such as green to green blue in the spring and summer months. This can affect the water color but has no effect on the water quality,”

She added that this water is not being served to DWP customers since the Silver Lake Reservoir is no longer part of the city’s drinking water system.

DWP is continuing to monitor the water, and has long-term plans to install aeration and recirculation systems to help slow algae growth of in the water, Cheng said.

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