Napier City Council is urging the public to avoid contact with the water in the inner harbour.
About 11am Tuesday a staff member driving past the corner of West Quay and Pandora Road noticed a discharge from manholes in the area.
This discharge had run into the roadway, and into the stormwater network. "It was unclear whether the discharge had reached the inner harbour," a spokesperson said.
The cause appeared to have been a blockage in the wastewater network, which was later cleared by staff.
The source of the discharge is under investigation.
