The New York Department of Consumer Affairs accused Whole Foods Market on Wednesday of overstating the weight of some prepackaged products sold in the company’s stores in the city.

Tests of 80 different prepackaged products bought in the company’s nine New York stores showed that all were labeled with erroneous weights, the department said.

In one case, the department said consumers buying vegetable platters priced at $20 each were overcharged an average of $2.50. In another example, eight packages of chicken tenders priced at $9.99 a pound on average cost $4.13 more than they should have.

John Hempfling, chief litigator for Whole Foods, said the company had been working to address the city’s concerns since December, walking officials through its auditing and training programs and having them meet with regional executives.