The National Capital Authority (NCA) has issued an Extreme Alert Level for blue-green algae in East Basin in Lake Burley Griffin.

At present, the blue-green algae levels in this water are at the Extreme Alert Level. As exposure to this level of blue-green algae carries an increased risk of adverse health effects, the water is closed to primary-contact recreation.

Primary-contact recreation means recreation that involves whole-body water contact or submersion of the head. Examples include swimming, diving, waterskiing and windsurfing.

Secondary-contact recreation (such as rowing, fishing, boating and canoeing) will still be permitted, however people should not engage in secondary-contact recreation unless:

• they are experienced;
• they are informed of the algae risks and what to do if contact occurs;
• they do not engage in primary-contact during the recreation; and
• showering facilities, with suitable water, are available for washing after the recreation.

Clothing that has been in the water should also be washed to remove any blue-green algae residue.

Water event organisers should ensure that there are adequate showering facilities and that all participants are experienced and are aware of the blue-green algae alert level and the associated exposure risks.

Pet owners should not allow their animals to swim in or drink the water, as blue-green algae can make pets very ill or even result in death.

Algae levels can change quickly depending on the weather and water nutrient levels. Water users should look for algae warnings signs at major water entry points to see the current algae alert level.