People are asked to avoid watering gardens and businesses are asked to conserve water.
A search was launched for Fletcher Wong after he was reported missing from the music festival.
People have been moved to a nearby assembly point.
Fletcher Wong was reported missing on Tuesday.
He was last seen leaving the festival site at 2am on Tuesday.
All occupants of the vehicle have died.
A Gisborne sheep that evaded capture for five years has finally been shorn, producing a record-breaking fleece.
She's been dubbed "Gizzy Shrek".
Gisborne District Council says it is investigating.