As of Dec 5, the advisory has been lifted at Thetis Lake. However, blue-green algae blooms are unpredictable and may occur at any time.
The CRD, in consultation with Island Health, has lifted the blue-green algae advisory at Thetis Lake, located in Thetis Lake Regional Park. Water samples collected indicated a “below detection limit” result for cyanotoxins. The extended absence of blue-green scum combined with test results are good indicators that the bloom is over.
Park users are reminded to watch for the distinctive blue-green sheen that can appear on the lake surface at any time. These blue-green algae are known toxin producers. Ingesting water containing the blue-green algae may cause a range of symptoms, including headaches and abdominal pain in humans, and can lead to lethal liver damage in dogs.
Please visit www.crd.bc.ca/alerts and Twitter @crd_bc for updates on active alerts. To learn more about blue-green algae visit these sites:
• Healthlink BC
• Health Canada
Thetis Lake Regional Park map (PDF)