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People are being warned not to swim in or drink water from two central Alberta lakes-Pigeon Lake and Lac La Nonne-where toxic blue-green algae has shown up | WikiMedia. ADVERTISEMENT. PIGEON LAKE, Alta.- People are being warned not to swim in or drink water from two central Alberta lakes where toxic blue-green algae has shown up. Alberta Health Services has issued advisories for Pigeon Lake, south of Edmonton, and Lac La Nonne, northwest of the city.People are urged to see a doctor if they come in contact with affected water and suffer adverse health effects.lberta Health Services has issued advisories for Pigeon Lake, south of Edmonton, and Lac La Nonne, northwest of the city. People are urged to see a doctor if they come in contact with affected water and suffer adverse health effects.