Unpaid violations start accruing penalties 30 days after they are issued. Those increase over time, and if the ticket remains unpaid for 180 days it is referred to a debt collection agency. The PPA successfully collects about 18.5 percent of violations referred to debt collection. One of the challenges, said Corrine O'Connor, a deputy executive director with the PPA, is the number of violators who are not Philadelphians and don't have any fear of being booted by the PPA.