Levin and Ōhau residents are being asked to turn off the tap while they brush their teeth despite having just come out of the wettest December on record.
While 283.2mm of rain fell in the Levin region last month, just 18.6mm had been recorded in the first three weeks of the new year.
That meant Horowhenua District Council was now advising all residents connected to the town water supply that water restrictions were in place for Levin and Ōhau until further notice.
The restrictions in Levin and Ōhau are due to flows in the Ōhau River dropping below 1500 litres per second and town water demand at above 11,000 cubic metres per day.
HDC had issued some suggested water saving tips: