The National Capital Authority advised the high powered jet will remain off to protect the public from exposure as winds can create fine mists and cause lake water to travel to foreshore areas.

Recent weather conditions have promoted the abundant growth of the algae and pet owners have been warned to keep their animals clear of the lake waters.

"Blue-green algae is naturally occurring in fresh water but the increased levels of blue-green algae we are seeing may be due to cool nights and bright sunny days. Given the right conditions, blue-green algae numbers can increase quickly," NCA chief executive, Malcolm Snow said.

"We remind the public that by keeping gutters and drains clean of leaf waste and grass clippings, less nutrients are washed into the lake. Over time green waste increases the nutrient load which often aids blue-green algae growth."

The jet will not operate while elevated algae levels are present and will remain closed until further notice.

Secondary contact recreation activities such as rowing, fishing, boating and canoeing will still be permitted.

However ACT Health's has advised the public to avoid such activities unless they are experienced and informed of the associated risks of contact with algae.

Symptoms of blue-green algae exposure may include skin/mucosa irritation, flu-like symptoms, and gastrointestinal illness.