Popular Auckland beaches have been deemed too dangerous to swim at after wastewater contamination has led to sewage in the water.
Safeswim has advised against swimming at the beaches along Castor Bay on the east coast of the North Shore.
As of 9am on December 14th, the wastewater overflow sensor read "very high risk" at Castor Bay, the Wairau Outlet, Milford, and Milford South.
The black flag at these beaches is expected to stay raised until at least 7pm on Friday the 15th.
A black flag lets people know there is a very high risk of illness from swimming at these beaches.
While the black flags will not be physically present at the beaches, people are advised to check the Safeswim website for updates.
While overflows are more common in wet weather, they can happen in dry weather if pipes are damaged or blocked.
Additionally, Judges Bay in Parnell and the Weymouth beaches in South Auckland currently have a very high water risk due to sewage contamination
Judges Bay has no projected end to the black flag while Weymouth is expected to be safe late Thursday.
Ten other Auckland beaches have long-term alerts against swimming because water quality tests have consistently failed to meet national standards, including Green Bay, Piha North Lagoon, and Fosters Bay.
In October, Watercare apologised to Aucklanders after a sinkhole spewed wastewater into the Waitematā Harbour.
