A report has revealed Wellington Water is majorly missing performance targets

The median response time for attendance to urgent callouts was 23 hours between July and the end of September, falling well short of its one-hour target.

Wellington Water estimates it needs 600 thousand dollars of additional operating funding to clear a backlog of leak jobs.

It's now facing increasing pressure while it deals with a wastewater pipe collapse in the city.

Mayor Andy Foster has put the poor performance down to the bedding in of a new sub-contractor.