Kerry County Council hasn’t recorded any deterioration of the algal bloom in Lough Leane.
The growth was identified on the Killarney shoreline in July and precautionary signage has been erected near Glenna Bay and around the lake.
Visitors to the area are being advised to exercise caution and not to allow dogs enter the water.
The growth was caused by the warm and humid conditions.
The council are continuing to monitor the situation.