Compton Fire Chief Jon Thompson was placed on paid administrative leave after city officials learned he could not provide the proper paperwork that showed firefighters were trained to use life-saving defibrillators.
Without the paperwork, the Los Angeles County Emergency Medical Assistance Agency ordered the Compton Fire Department pull all machines from their fire trucks.
"We are reporting in compliance with the county and providing adequate public safety," said Compton Mayor Aja Brown.
Brown added that the lack of proof was caused by "paperwork oversight" rather than a lack of training.
"It's critical that we uphold a standard and that we are accountable to our citizens," Brown said.
City Councilwoman Janna Zurita said she found out about the issue on Monday.
"When I became aware I called the city council members for a meeting which didn't happen," said Compton Councilwoman Janna Zurita. "We owe an explanation to the city of Compton."
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Former Fire Chief Rico Smith has taken over the department and will serve as interim chief.
Thompson will continue to be paid while on leave until the city manager determines what action to take next.