People calling ambulances when their health concerns could be dealt with by their primary health carer was another issue, he said.
"Part of our increasing workload is from an increase in calls that don't need an ambulance. We're doing a lot of work at the moment around educating people around when and when not to call ambulances."
The Northland team was fully staffed but always needed more volunteers, particularly in rural areas, he said.
New Zealand Ambulance Association chairman Mark Quin said a huge challenge lay ahead.
The service increasingly needing to be a "jack of all trades" was also putting pressure on the system, he said.
"Often we're the default [healthcare provider] - especially in weekends and after hours. In some cases, people are unable to access a GP so they call an ambulance.
"Another increasingly big area of or work is mental health. It's another area that lacks services, particularly after hours and during weekends."
Further Government support wouldn't go astray, he said.
"The fire service and police are fully funded by the Government. We're equal in our position in the community so we should be fully funded for the benefit of the public."