UPDATE: Increase Found In Lake Burien’s Toxic Algae; Warning Issued
On Wednesday (Sept. 1st), we received an update from Miller/Walker Creek Basin Steward Dennis Clark that new tests show an increase in the toxic algae found last week in Lake Burien (read our previous report here).
According to Clark, a lake resident took another water sample from Lake Burien on Monday, Aug. 30th, and had it analyzed by King County. Preliminary analysis shows an increase in the algae toxin (microcystin) from 5.72 to 9.4 micrograms per liter – a 64.3% increase.
This new concentration is above the state’s proposed recreational guideline “caution level” of 6 micrograms per liter and should be taken seriously.
Small children and dogs should be kept out of the water to avoid ingestion of the algae.
King County staff encourage people to continue to follow the other recommendations listed here (PDF file).
Owing to the upward trend in the toxin concentration from Aug. 16 to Aug. 30, King County will begin analyzing samples on a weekly basis while recreation use of the lake remains high.
All updates on the toxin concentrations in Lake Burien will be posted at the Miller/Walker Creek basin webpage here (we’ll also post them as we get them).