Latest test results have enabled Seqwater to reopen Lake Borumba to boats and paddle craft but blue-green algae levels mean the lake will remain closed to skiing.
Water quality results received, show algal and toxin levels have dropped to the point that the lake can be opened to some activities, including boating, fishing and paddling.
The levels will need to drop further before skiing can resume, as this activity involves primary contact with the water.
Seqwater Chief Executive Officer Peter Dennis said water quality tests continued to be fast-tracked in an effort to reopen the lake as soon as possible.
"We will keep checking water quality and re-open the lake to all activities as soon as it is safe to do so," Mr Dennis said.
"The decision to close a lake to any activities is not one we take lightly. We are very conscious of the impact water-based recreation closures have on the community, including local business. Public safety is our priority."
The Seqwater website (www.seqwater.com.au) and Facebook and Twitter pages will be updated as lake conditions change.
Visitors are asked to observe signage at Lake Borumba and follow the direction of Seqwater staff.
For more information, a fact sheet on blue-green algae is available on our website www.seqwater.com.au/about/publications/fact-sheets.