Water testing this week has shown that levels of Escherichia coli (E. coli) were within recreational water quality objectives at most beaches monitored by Manitoba Conservation and Water Stewardship.
Bathers are advised to avoid swallowing lake water, wash their hands before handling food, and avoid swimming with an open cut or wound, or if they are experiencing illness.
On Lake Winnipeg, bathers should minimize water contact if lake levels are high and strong winds are blowing from the north. Research shows E. coli tend to be elevated during these conditions as they are washed out of the foreshore wet sand and into the bathing area.
Algal blooms were sampled from Oak Lake at the marina and on Lake Wahtopanah (Rivers Reservoir). The number of blue-green algae cells was above the recreational water quality guideline but the concentration of algal toxin was below the recreational guideline. First-level algal advisory signs were posted this week at the Oak Lake marina and on Lake Wahtopanah (Rivers Reservoir).
Algal blooms were observed and sampled today at East Grand Beach on Lake Winnipeg. Results are not yet available but will be posted on the department web site as soon as they are available.
Algal blooms are difficult to predict and may form and then disperse quickly, or last for several days or weeks. Warm and calm weather coupled with relatively high nutrient loads provide ideal conditions for blue-green algae to develop.
People are reminded to avoid swimming in water where severe algal blooms are visible and to prevent pets from drinking water along the shoreline where algal blooms are present.
Home and cottage owners who use lake water as a source for drinking water should be aware that most small treatment systems are unable to remove algal toxins. Therefore where blue-green algal blooms are present, avoid drinking the water or using it for other domestic purposes.
In addition, since infants consume more water relative to body weight, parents may wish to use an alternate drinking water source (e.g. bottled water) for preparing infant formula during the summer months if their lake is prone to blue-green algal blooms.
Information on beach water quality results, advisory signs posted at beaches, and swimmer and water safety is available online.
