Olympia- A Blue-green Toxicity Advisory has been posted for Black Lake. Preliminary tests found toxin from blue-green algae in samples taken September 22. The tests indicate the algae toxin, microcystin, is likely at concentrations above the recreational guidance value established by the Washington State Department of Health.
Warning signs have been posted at Kenneydell Park, the public boat launch, and at other parks and public access points.
Heath impacts related to blue-green algae toxins can include:
- Nausea, vomiting, or acute liver failure;
- Irritation of the gastrointestinal tract, skin or other exposed tissue;
- Muscle cramps, twitching, paralysis, cardiac failure, or death in animals.
Lake residents and users are advised not to swim in or drink lake water from the affected areas. Pets and children should be kept away from the lake. People fishing are advised to practice catch and release while the advisory is in effect.
Additional samples will be collected weekly to determine when the toxin is no longer present. The lake will remain posted until toxin concentrations fall below the advisory level.Additional information about toxic blue-green algae can be found at:www.co.thurston.wa.us/health/ehadm/swimming/swimming_index.html orwww.ecy.wa.gov/programs/wq/plants/algae/index.html-30-