FIREFIGHTERS throughout Victoria continue to oppose the CFA hierarchy's move to carve up established groups into new regions.

Many are warning the changes could lead to disenchantment with the organisation.

CFA volunteers in both remote rural areas and those in semi-urban areas are affected by the plans to restructure CFA regions to align with municipal boundaries.

Volunteers are calling on the CFA's top brass to heed their warnings that if grassroots volunteers are ignored, they will leave.

Bass Coast group officer Damien O'Connor said the planned changes had the potential to jeopardise the survival of the 10 brigades within his group.

Mr O'Connor said the issue was also distracting volunteers from the primary task of firefighting and was harming the volunteer spirit post-Black Saturday.

CFA plans to split the Bass Coast group's Dandenong headquarters between Warragul and Sale.

"So instead of going on a one-hour drive, which people from this area do regularly for CFA things, now we'd have to go two or three hours away," Mr O'Connor said.

"If this goes ahead, unfortunately we would definitely see people leaving the CFA, in one form or other, and many would take a step back.

"It is harder and harder to recruit volunteers, so this is the last thing we need."

Mr O'Connor said volunteers believed the CFA and State Government were wrong to try to make these changes before the Royal Commission into the Black Saturday bushfires concluded, given that further change was likely.

Issues with boundary realignments also remain unresolved in other parts of the state.

In the Casterton group some brigades have recently voted in favour of remaining in their current region, instead of moving to Horsham.

Nationals MP Ken Jasper said there was also opposition to boundary realignment in North East regions, such as Yarrawonga.

CFA chief executive officer Mick Bourke said the new regional boundaries would be of lasting benefit.

"Consultation has already been going on around the state and this is an ongoing process," Mr Bourke said.

"We are talking with our members to work through the changes so they have every opportunity to have a say in the final outcomes.

"We are asking our members to work with us through any potential challenges, and we will continue to do that until we get it right.

"Through the consultation to date our members, in the main, are saying, 'this makes sense, get on with it'."