Algae was discovered in the water before last weekend.
Alberta Health Services is advising the public not to swim in certain parts of Wabamun Lake.
Last Friday, health officials discovered blue-green algae in the waters.
AHS says those who are near the water with the algae present should avoid swimming and fishing in it and to keep their pets away from it too.
This advisory comes after health officials issued a water quality advisory for Wabamun Lake Provincial Park Beach a few weeks ago.
The Wabamun Lake advisory will remain in effect until further notice.