The Police Protective League stated its intention to allocate several million dollars towards advertising and mailers to campaign against Measure FD. Union President Ricky Mendoza expressed concerns about the tax being a "permanent tax" with no specified end date, emphasizing that while the union supports public safety and hiring firefighters, the perpetual nature of the tax is an "affordability issue."

Firefighters' union president Doug Coates defended Measure FD as a critical public safety decision for the city, urging voters to approve it. He suggested that opposing the measure would put the public at risk, particularly in vulnerable communities. The firefighters' union has also called for a special meeting to potentially authorize an additional $3 million in spending to support the measure, having already invested over $2 million.

Internal polling cited by the firefighters' union indicates Measure FD is positioned to gain majority support, but they acknowledge the need for a robust response to opposition from the police union and potential negative campaigns. The measure requires a simple majority to pass and would increase the city's sales tax to 10.75%, costing an average of $86 per person annually. If approved, the Fire Department, which has a budget nearing $1 billion, could see an additional $345 million each year, potentially enabling the construction of 30 new fire stations and an increase of approximately 1,400 personnel by 2050.