The Taihape water treatment plant is making "slow gains" towards being full so that maintenance can be carried out.
On Sunday the Rangitīkei District Council urged Taihape residents to conserve water due to recent rain putting pressure on the water treatment plant.
Taihape gets its water from the Hautapu River and, when it rains, more sediment makes the water dirtier and it needs more treatment to make it into clean drinking water.
Rangitīkei District Council chief executive Peter Beggs said the irony was the recent rain meant they had to conserve water.
Beggs said Taihape residents were being asked to reduce their water usage because the reservoir must be full in order to carry out maintenance.