FOLLOWUP: Toxic Algae Levels Decreasing In Lake Burien

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We’ve been following the story about levels of toxic blue-green algae found in Lake Burien for a few months now (read our previous coverage here), and here’s the latest courtesy Dennis Clark, Miller/Walker Creek Basin Steward:

On Wednesday, November 3, a sample of clear lake water was taken from south shoreline of Lake Burien and analyzed for the presence of toxins in the algae.

Final results came from the lab today.  The concentration of the November 3 sample was 0.81 micrograms per liter.  This is a major decrease from two weeks previously, which generated a reading of 41 micrograms per liter for a scummy sample at the same location.  This latest reading continues a downward trend and is far below the 6 microgram per liter state-recommended caution level.

We will take another sample November 17 (two weeks after the November 3 sample).  If that sample also is below 6.0 micrograms per liter, we will conclude that the lake has ended its production of toxic algae for the season and we will cease sampling.

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