St John in Kurow is desperately short of volunteers and a public meeting is being held in the town next month to address the issue.
Only four volunteers service the area within the Ohau turn-off to the top of the Lindis Pass, down to Duntroon and including the Hakataramea Valley.
Station manager Jon Brocas said the station had good resources and was well supported but St John in Kurow was still struggling with numbers.
A meeting will be held in the Kurow Memorial Hall on September 3 at 7.30pm.
People interested in keeping the service in the district have been urged to attend.
Mr Brocas said it was not a hard job and it was not a "gory" job.
The station had two callouts last month and three in June.
People were needed who were ready to commit themselves.
The town had always been very supportive of the ambulance service, he said.
Volunteer Kate White said the service would not survive unless volunteers came forward.
There was a complacency that "it'll be OK" because the ambulance from Oamaru or the rescue helicopter would cover, but that was not always possible, she said.
