Okla. Admin. Code § 380:40-1-21
Volunteer fire departments that exist as a subdivision of a larger municipal organization are within Oklahoma Department of Labor jurisdiction if that larger municipal organization employs one or more paid workers. In such cases, the inspection and enforcement jurisdiction of ODOL extends to all duties performed by any worker or volunteer on behalf of the Volunteer Fire Department. For purposes of this Chapter, "fire department" means any duly constituted fire department operating under the authority of Title 11 fire departments or Title 19 fire protection districts meeting the definition of employer. Industrial fire brigades are excluded from this definition. However, fire departments and industrial fire brigades are covered by regulations of other agencies. For purposes of injury and illness recordkeeping and the Public Sector Survey, injuries occurring to those employees who are classified as volunteers are not recordable and are not included in the survey.
Okla. Admin. Code § 380:40-1-21