Parts of Waikato are having to restrict how much water they use due to the hotter weather.
Hamilton, Waipa and Waikato district are only permitted to use sprinklers for four hours a day after consumption jumped up to 20 per cent.
Sprinklers are now only permitted to be used between 6am to 8am and 6pm to 8pm, while hand-held hoses can be used any time.
The three councils run a Smart Water alert system with 1 being the most minor measures and 4 the most drastic, and bans any use of outside water systems.
Smart Water co-ordinator Sally Fraser said the increase is due to pools being filled up and sprinklers being turned on.