Some Ōpōtiki residents have been told to avoid flushing their toilets as the region is drenched by rain.
The Bay of Plenty town is one of many under an orange heavy rain warning today.
Ōpōtiki District Council said people need to "avoid unnecessary discharge of wastewater" as the system struggles with the deluge.
"Our wastewater pump stations have become inundated with stormwater and this is having an effect on some household bathrooms and toilets," a statement read.
"Portaloos will be available at the Rawinia Rangi Reserve (the old Rose Garden playground) for those that are having issues with their wastewater."
The region's roads are also suffering, with State Highway 35 closed between Ōpōtiki and Te Araroa until further notice due to "multiple slips".
"Our crews have encountered multiple slips and continue clearing them. The road is likely to remain closed for several hours," a Tweet from Waka Kotahi NZTA Waikato Bay of Plenty read.
Drivers are told to avoid the area and consider using the lengthy alternative via State Highway 2 through the Waioeka Gorge.
The Ōpōtiki District Council said crews are working hard to make urgent fixes but advised motorists to be patient.
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