The City of Shoreline tests our lakes and ponds when potential toxic algae blooms are found. Toxic algae can look many different ways and should always be reported to the City at (206) 801-2700. Below are examples of blue green and clumping algae that could be toxic. Toxic algae can also appear to look oily, like a paint spill across the lake or pond. For more information, see: https://buff.ly/3NzcTh4
Original source can be found here.
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