This in from the NCA:
The National Capital Authority advises parts of Lake Burley Griffin are closed to primary contact activities following a sewage leak at Yarralumla Bay.
Yarralumla Bay, Yarralumla Beach, Weston Park East and Black Mountain Beach are closed to recreation activities that involve whole-body water contact or submersion of the head.
The NCA will monitor water quality and will re-open the areas as soon as clear test results are received.
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Warning signs will be posted around the exclusion areas.
More information will be posted on this site as soon as possible. We apologies for the inconvenience.