A Wellington City Councillor says he's frustrated to see yet another example of the capital's water infrastructure failing. 

Heavy rain flooded the city's wastewater treatment plant's lower floors, causing sewage to leak into Tarakena Bay, writing off equipment and forcing the plant to shut down. 

Untreated wastewater is currently flowing into the southern coast, with Wellington Water saying it could take days to fix. 

Wellington Eastern Ward Councillor Sam O'Brien told Ryan Bridge it's an ongoing issue, and this isn't an isolated thing. 

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