But even with trash piling up on the streets and other city services understaffed, Mayor Cherelle Parker (D) would not agree to the demands made by AFSCME District Council 33, Philadelphia's largest blue-collar union.
Parker has offered a pay increase of 8.75% over the next three years, which she described as historic.
But DC 33 president Greg Boulware said that's far too little for municipal workers, many of whom are among the city's "working poor," to survive.
"It's not like as if our members are making $80,000, $90,000 a year," Boulware said. "A 2% increase on those would be significantly higher than it would be on somebody making $40,000-$45,000 a year. So, her math truly is not mathing, and you're clearly not paying attention to the working people that are going on in this city."
The average municipal worker in Philadelphia makes around $46,000, which is $15,000 less than the median income in the city and less than half of what a single adult needs to live comfortably, according to a study by SmartAsset.
"We got people that work and repair the water mains and can't afford their water bill," Boulware said at a rally last week. "We got people that repair the runways at the airport and can't afford a plane ticket. I don't want to be rich. We just want a comfort inside the city that we serve daily."
The union initially asked for an 8% raise for the next four years, which the city dismissed. This weekend, they pared their proposal down to 5%, but the city still did not budge.
Parker has insisted that her smaller proposed increases are merely what is "fiscally responsible," and that the city cannot afford to offer more.
The union has disputed this, pointing out that Parker herself is budgeted to receive a 9% increase to her salary of more than $240,000. That increase alone is nearly half the current salary that the average DC 33 member makes in a year.
As of Monday, negotiations have stalled, with no clear end in sight. With a throng of picketers behind him, Boulware told NBC 10, a local affiliate, that the union was working on a third proposal, and that negotiations may resume Tuesday. But he seemed to expect more obstinacy from the city.
"We've been there to be able to sit and meet and negotiate," he said. "It doesn't seem like the city quite honestly wants to entertain any of the questions that we have about things and actually have a true dialogue... That's how you negotiate and that's not truly what's been going on."
Despite the city's refusal to budge, momentum around the strike has continued to grow. On Friday, rapper LL Cool J dropped out of a 4th of July festival in the city, saying, "There is absolutely no way I can perform across a picket line."
Other AFSCME councils around Pennsylvania have joined pickets in solidarity. This includes Philadelphia's Council 47, which represents thousands of "white collar" city workers.
With mounds of trash accumulating on streets, sometimes becoming as "tall as people," the environmental activists with the Sunrise Movement have also joined in the effort to pressure the city. On Monday, activists hauled bags of trash into the lobby of City Hall, labeled with the words "Meet DC 33 Demands" written in yellow tape.
AFSCME, meanwhile, has stated its resolve to fight on as the strike has gained national attention.
"City workers are holding the line until they get a FAIR contract with the wages and benefits they deserve," the national union's account wrote on X Monday. "One day longer, one day stronger, no matter what it takes."
