Ōpōtiki District Council is asking people to avoid the unnecessary discharge of wastewater as its wastewater pump stations have become inundated with stormwater.
In a Facebook post the council said this was having an effect on some household bathrooms and toilets.
It asked people to avoid flushing toilets unnecessarily.
It has provided portaloos for those that are having issues with their wastewater at the Rawinia Rangi Reserve (the old Rose Garden playground).
Meanwhile, police are reminding motorists to drive to the conditions in the Rotorua area due to bad weather.
There is a slip on State Highway 5, Ngongotaha Valley, and surface flooding across the area.
Metservice has issued heavy rain warnings for Coromandel and Bay of Plenty from Te Puke westward, for 27 hours from 3am Saturday to 6am Sunday.
Between 100mm and 130mm of rain is expected, peaking at 10mm to 20mm per hour.
A similar "orange" warning is in place for Bay of Plenty, east of Te Puke and Gisborne north of Tolaga Bay, for 24 hours from Friday with up to 170mm expected, MetService predicts.
The highest rates of rainfall will be in the ranges east of Whakatāne, meteorologists believe.
According to police, driving to the conditions means increasing your following distance because it takes longer to stop in the rain, taking care while on the road, delaying unnecessary travel, using headlights and slowing down.
