The city's Department of Consumer Affairs says one out of two food stores it inspected in the city was overcharging its customers.
According to the DCA Commissioner Jonathan Mintz, the agency checked out 983 supermarkets across the five boroughs over the past year to see if mistakes were made at the cash register.
"The results of our inspection were very troubling," Mintz said. "We're very unhappy with what we're seeing out there."
Inspectors checked whether items were priced correctly, weighed correctly and taxed correctly.
The DCA issued 516 violations as a result of the study. The supermarkets could face more than $380,000 in fines to the city.
Mintz said because of the results of the sweep, inspectors will do double the number of inspections in the coming year.
DCA officials says the most common violation was for a lack of item pricing.