The ACT government has lowered its blue-green algae alert for Lake Tuggeranong.
The lake has been reopened for secondary contact activities, which include rowing, fishing, boating and canoeing.
But the lake remains closed for activities that involve whole body water contact including swimming, diving and windsurfing.
Pet owners should also not allow their animals to swim in or drink the water. The Environment and Sustainable Development Directorate said the lake remained closed for primary contact activities because the level of blue-green algae was still considered extreme.
Anyone concerned about possible symptoms of blue-green algae exposure should contact their local doctor.