A discarded cigarette is suspected to have sparked the blaze that called Papamoa's duty firefighting crew away from the brigade's annual honours night dinner on Saturday.
Chief fire officer Allan Bicker said a passing police patrol spotted the blaze in sand dunes about 9.30pm and raised the alarm.
Volunteers and guests had just finished eating their meal at the function in the fire station when the call came in.
It meant that the duty crew, who had been abstaining from alcohol, were on their way to the fire within a couple of minutes.
Mr Bicker said a 5sq m section of dunes between Grant and Alexander Places was burned in the scrub fire.