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Level 4 water restrictions are now in place at Akaroa, Takamātua and Duvauchelle to counter the extra pressure on water supplies.
The level 4 restrictions mean there is a total ban on outdoor water use, and hand-held hoses, unattended hoses, sprinklers, and garden irrigation systems are not allowed. Using water to fill pools or paddling pools is also not allowed.
Gardens can still be watered by collecting indoor water already used for washing vegetables, dishwashing or bathing.
Akaroa, Takamātua and Duvauchelle have been on level 3 water restrictions since January.
Meanwhile, a boil water notice is still in place for Akaroa and Takamātua’s shared water supply due to the contamination of a local reservoir.
Christchurch City Council head of three waters and waste Helen Beaumont said the hot weather combined with a drop in the streams that supply drinking water to the townships has prompted the move to level 4.
"The streams that supply drinking water to Akaroa, Takamātua and Duvauchelle are extremely low following much lower-than-average rainfall this year," Beaumont says.
"We’re currently tankering a lot of extra water to Duvauchelle from Wainui every day because we can’t take any more from the local streams.
"We’ve increased the level of water restrictions to help maintain a reliable water supply to people living, working and visiting in the areas, and to make sure we’re complying with our resource consents to protect the streams that supply the drinking water."
The city council has set up electronic signs to advise people about the water restrictions.
Beaumont said the level 4 restrictions will remain in place until further notice.