Raleigh firefighters worked 117,000 hours of overtime in a year.
After a WRAL investigative report, Mayor Pro Tempore Stormie Forte has asked the fire chief and city manager to address the issue and offer possible modifications.
"We need to address appropriate staffing levels, firefighter burnout, voluntary overtime, and some other issues," she said.
President of the Raleigh Professional Firefighters Association Andrew Davis told reporters conducting the probe that the extra overtime hours were resulting in burnout.
Although the overtime hours are voluntary and some appreciate the additional income, he hoped the city would focus on adding additional positions, which they have not done in more than 10 years, despite the growing population.
A firefighter training academy is set for February.