Access Canberra has issued an extreme alert for blue-green algae in Lake Tuggeranong, while the National Capital Authority found water in Lake Burley Griffin was affected by blue-green algae in a water quality report conducted on February 1.

Swim Guide has advised various locations along Lake Burley Griffin, such as Lotus Bay, are unsafe to swim in.

At Lake Tuggeranong, swimming and diving have been banned. These are categorised as primary-contact recreation, which includes activities where the whole body is in contact with the water or where the head is submerged in the water.

Rowing, canoeing and fishing - secondary contact recreation activities - are still allowed at the Lake Tuggeranong for individuals if:

Individuals should avoid contact with algal scum, and any clothing that has been in the water should be washed to remove blue-green algae residue.

The alert requires water event organisers to ensure participants are aware of the blue-green algae alert and risks of exposure. Organisers must provide appropriate shower facilities.

Pet owners must not allow their animals to swim or drink in the water as blue-green algae can cause illness or death in animals.

Canberrans are urged to keep up to date on algae warnings which are located at public access areas.

Anyone concerned about symptoms of blue-green algae exposure should contact their GP.

Access Canberra have also put out warnings for other popular waterfront destinations.

Bimbi Beach and Bargang Beach at Lake Ginninderra are closed to swimmers following detection of bacteria.

Murray's Corner at Paddy's Creek, Cotter Campsite at Cotter River, and various locations along Murrumbidgee river have been closed due to bacteria concerns.

For more information on blue-green algae visit www.environment.act.gov.au. For additional information about water quality go to City Services ACT.