The assault of a 17-year-old girl at a central Victorian fire brigade last year was "not an isolated event", but an example of cultural problems at the station, the Country Fire Authority (CFA) has found.

An investigation into the Eaglehawk Fire Brigade was launched in December after footage showed the young female volunteer being dragged under a fire truck and sprayed with water in November.

The CFA said the investigation had found the attack was part of a "pattern of poor behaviour" at the station.

It confirmed brigade captain Hayden Allen quit before he could be disciplined.

"If he had remained in the organisation he would have faced serious disciplinary action," the report said.

"In the event that he sought to return to CFA, his application to re-join would be denied."

The inquiry found the girl was targeted repeatedly by some of her colleagues, and in one instance was taped to a fire truck.

Two volunteers have been suspended, and others have been disciplined and counselled.

The investigation also found:

There were cultural problems at the brigade, including a lack of discipline and respect

There were cultural problems at the brigade, including a lack of discipline and respect The consumption of alcohol was a contributing factor in at least one incident

The consumption of alcohol was a contributing factor in at least one incident The brigade was let down by significant leadership deficiencies by its then-captain, who was involved in a number of incidents and displayed a lack of responsible leadership

After the November incident, concerns were raised immediately by another volunteer, but they were initially dismissed, the report said.

The volunteer raised the issue again three days later with two other senior members of the brigade, which led to the investigation.

The CFA said a number of changes would be made at the station and steps would be taken to "improve leadership and cultural issues".

"CFA does not tolerate any form of abuse, harassment or discrimination and all volunteers and staff are encouraged to utilise the range of wellbeing service provisions available to them, including the Complaints Hotline," the CFA said in a statement.

"It is vitally important that cultural problems inside the organisation are addressed and young CFA volunteers are supported and encouraged to continue the good work of CFA.

"CFA must collectively take a stand and work together to ensure that we grow into a modern and inclusive organisation for the future."