The New South Wales Rural Fire Service (RFS) says it has withdrawn its support for police at an anti-coal seam gas protest on the state's north coast, after public criticism.

The RFS catering truck was providing back up support for police at an anti-CSG protest site yesterday near Kyogle.

Police had requested the catering service be there for local police and a tactical squad, which had been called in to protect Metgasco's drilling equipment and activities.

Don Durrant resigned yesterday in protest against the RFS's role.

Mr Durrant says he has been a volunteer for almost 30 years and supporting a coal seam gas company is not what he signed up for.

"I was amazed that they would do that, that they would be called to do that and accept that task," he said.

"I've never known that before, never heard of it.

"We do things at fetes, or whatever, at the school we do certain things to raise money for our brigades, but we don't go out and aid gas companies, foreign-owned gas companies in our land."

The RFS says it is a contentious local issue and should not involve its volunteers.

Superintendent Michael Brett from the Northern Rivers RFS says he is disappointed to hear about the resignation.

"People that were there were volunteers, were members of the community and they just thought that what we were doing was probably not in the best interest of the community," he said.

"The RFS being a community-based organisation has to really look at that very closely and the decision was made yesterday afternoon that we would have to withdraw our services."