Ms Lamont, who has been with the brigade for 18 years, launched a parliamentary petition last month, which states there is "a duty of care that is being missed, and volunteers are suffering".
To date, 33,150 people have signed in support.
Ms Lamont launched the petition because a local firefighter was affected by post-traumatic stress disorder (PTSD) following a horrific incident late last year.
They were unable to work as a result, and had no financial support.
"And through this I witnessed the impact it had on their life and I just could not stand back and watch people suffer like this, as a result of their community involvement."
The Otago Daily Times earlier reported Kingston’s Chief Fire Officer Peter Ottley had stepped down from his volunteer role, and had taken time off his paid employment, after being diagnosed with PTSD, triggered by a fatal crash between a bus and a car in December.
He was not eligible for ACC cover because his trauma stemmed from a volunteer role.
"Volunteers are not covered for the mental trauma or gradual workplace illness through ACC because they're not paid," Ms Lamont said.
"ACC defines ‘employment’ as working for financial gain.
"And there is no financial gain with a volunteer."
She said in the Wakatipu all firefighters were volunteers — between Queenstown, Frankton and Arrowtown, alone, there were about 100 of them.
Ms Lamont said her colleagues attended all sorts of fires, but increasingly responded to motor vehicle accidents and "a big proportion" of medical events.
"Anything that is considered a ‘purple call’, which is deemed to be life-threatening, the fire service responds to."
Often, that meant volunteers had to leave their paid employment to attend, and once the job was over, go back to work.
And in small communities, the chances were "fairly high" a person involved in a callout was someone they knew.
Regardless, volunteer firefighters were called out "over and over again", which started to "weigh heavy on you".
"What we'd like to see is some equality and fairness just across the board ... these volunteers, they stand together with their paid colleagues.
"They face the same traumas, the same risks, but when they're injured or they have a mental injury because of this service, they're treated differently.
"What we want is recognition of what the volunteer firefighters endure, that they receive the support and recognition that they deserve in their role as a volunteer.
"Changing the legislation would acknowledge that incredible contribution that comes from this wonderful group of people," Ms Lamont said.
The petition closes next Wednesday and will be presented to Labour’s ACC spokeswoman Camilla Belch next Friday during the National Firefighters’ Combat Challenge, in Wellington, at which about 400 firefighters will be competing.
Ms Lamont expects it to be presented in Parliament on May 6 after which it will be sent to the Petitions Committee.
It may stay there, or be sent to another committee. A decision will be then made whether to hear public submissions.
