Sewage flowing into Wellington harbour is continuing to cause problems this morning.

Photo: RNZ / Emma Hatton

A collapsed pipe has caused more than five million litres of sewage to spill into the harbour since Friday morning. The burst underground pipe will be replaced by an overground pipe.

Wellington Water diverted a significant amount of the wastewater through an old pipe as a temporary fix, bring a stop the amount flowing into the harbour.

Crews have been working in dinghies to clean up along the shoreline.

It still isn't safe swim, particularly along the waterfront between the port and Oriental Bay, and will take about three days to clear up. Scorching Bay, which is around the corner, is safe to swim in.

Wellington Water chief executive Colin Crampton told Morning Report there was no more sewage flowing into the harbour.

"We've been able to remove all the wastewater from a big storage tank under the Michael Fowler Centre. We're now really satisfied there's no more wastewater going into the harbour."

He said it was tricky to run the pumps on the foreshore manually and use temporary pumps.

Crampton said sewerage pipes would run overground "right at the top of Willis St" for another two months acknowledging it could make business owners "grumpy". But he said they would be kept in the loop on any progress.

The pipe is 600mm in diameter and while it could be awkward to work around it, "people are going to have to live with that for a couple of months".

"Straight after Christmas, we will begin with the permanent solution. We're targeting the end of February, we'll have the new pipe put underground and it will all be back to normal."

Wellington Chamber of Commerce chief executive John Milford said some business owners were frustrated by the disruption.

"The questions have to be asked after we overcome the problem as to what caused this and is this more symptomatic of an under-investment in infrastructure or is it just an unfortunate incident."

Photo: RNZ / Kent Atkinson

Road closures

City traffic will continue to be disrupted with streets closed so urgent work can be done on fixing the wastewater system.

Parts of Willis and Ghuznee streets remain closed, and Vivian St will be closed overnight this week from 8pm to 8am.

Crews now closing off The Terrace at Salamanca Road. Road shut until 6pm @NZMorningReport pic.twitter.com/repZmQxijp — Emma Hatton (@emma_hatt) December 22, 2019

EMERGENCY WATER WORKS – VIVIAN ST

Due to emergency Wellington Water works, #SH1 Vivian St will be CLOSING between Victoria St and Marion St from Sat 21-28 Dec, 8pm-8am each night to allow further investigation works to take place. Please plan ahead and use an alternate route ^CR pic.twitter.com/xzcOEvdVhT — NZTA Wellington (@NZTAWgtn) December 22, 2019