Timber and shingles from the sewage system are accused of causing a foul odor in the capital after raw sewage was spilled on Lambton Wharf last week.
Wellington Water’s investigations following Friday’s spill concluded that the unusual material that caused the blockage was likely from a construction site.
Last week, a wave of sewage opened a manhole cover on Woodward St around 4 p.m. and a steady stream of yellow-colored liquid hit Lambton Quay.
As a result, about 10 cubic meters of sewage ended up in the port.
* Former mayor responds to criticism of the condition of Wellington’s pipes
* Residents of central Wellington were asked to only flush the toilet if “essential” after a pipe burst
* Main pipe burst pouring silt onto Wellington CBD
The water service provider was working to see if he could confirm where the materials were coming from.
The inspections showed that the main sewage line had not been damaged.
Wellington Water reminded the public that materials other than feces, urine and toilet paper should not be dumped into the wastewater system.