Toi Te Ora Public Health had been notified, Cairns said.
He urged households to consider how they disposed of fat and grease to help reduce overflows.
“Most wastewater blockages occur when things are flushed down toilets and sinks that shouldn’t be, like fats and cooking oils or wet wipes.
“Washing leftover fats, oils and grease down your sink can block pipes as it cools and turns hard. Running hot water afterwards just moves the problem further down our wastewater network.”
Cairns said leftover fat, oil and grease should be cooled and binned.
It could be poured into a non-recyclable container or newspaper and put in the rubbish, or cooled fat could be scraped from pots and pans straight into the bin.
Consider adding a strainer to a sink plug to catch food scraps and other solids that could join with fats to create a blockage, he said.