Harmful algal bloom advisory issued for Hayden Lake

A public health advisory was issued Thursday for the upper end of Hayden Lake near Sportsman’s Park and the bay north of Sportsman’s Park point on the northern arm of the lake, according to a news release from Panhandle Health District in partnership with the Idaho Department of Health and Welfare and Idaho Department of Environmental Quality.

Recent water sampling by DEQ indicates the presence of cyanobacteria, also known as a harmful algal bloom. 

The advisory is based on the field observations, water sample results, potential public health impacts and the recommendation of DEQ. The public should take precaution throughout the lake as the harmful algal bloom can spread and move with wind and water traffic, a press release said.

Private domestic water system owners utilizing the lake as a drinking water source are cautioned that potentially present cyanobacteria cannot be removed by boiling or filtering the water. 

Cyanobacteria are a natural part of Idaho’s water bodies. When temperatures rise, their populations can bloom and toxic chemical compounds, or cyanotoxins, can be released into the water. Caution should be taken anywhere the water appears discolored or murky as algal blooms can spread or move with wind and water currents. 

These blooms have the potential to produce dangerous toxins, especially when accumulated in high concentrations. 

Physical appearance of these blooms can vary, presenting as discolored water, streaks or globs of scum and can cause thick green mats along lake shorelines. Pets, children, the elderly and people with compromised immune systems are most at-risk of harmful exposure.

The public is urged to use caution when recreating in or near the water if the appearance of an algal bloom is present.