Residents near Nulki Lake south of Vanderhoof had reported a significant blue-green algae bloom affecting Nulki Lake at the end of August.
Northern Health confirmed that there are no public water systems regulated by them drawing water from the lake, and the Health Authority says they have been in contact with both the Nulki Lake Stewardship Group and Ministry of Environment about the current bloom.
However, risks remain for recreators and local homeowners in the area as cyanobacteria, commonly known as blue-green algae, is toxic to humans and animals, with exposure often leading to acute illness.
Photo of blue-green algae bloom in Nulki Lake submitted to Algae Watch BC on August 24th, 2025 // Courtesy: Algae Watch BC, Observation ID: AW11973
As such, the Health Authority has advised all residents living near all lake shores, as well as visitors to all lakes, to avoid all contact with blue-green algae blooms, including swimming where the algae is visible, and to avoid drinking untreated lake water. This goes for pets and livestock too, as even boiling lake water can not remove the toxins produced by cyanobacteria. If exposure occurs, authorities say to wash the affected area with tap water as soon as possible.
Blue-green algae blooms are a naturally occurring part of lake ecosystems, but officials from the Department of Environment note, a warming climate along with seasonal increases in nutrients within lake water has led to the blooms becoming more common.
Algae Watch BC is the monitoring body that collects reports from BC residents on Algae Blooms, and you can submit a report to them via an online portal.
Additionally, the Environmental Health branches of the Provincial Health Authorities are available to hear concerns about Algae blooms. For Northern Heath, that number is 250-565-7322.
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