Mice, roaches, and flies have a regrettably great attendance record at some of the city's dirtiest public school cafeterias, according to a new report conducted by the State Senate and public school advocates.

Using data from the city's Department of Health and Mental Hygiene, the report identified 31 schools of the over 1,800 in the system throughout the five boroughs whose cafeterias have received the equivalent of a "C" in fiscal year 2015-16. Of these 31 schools, 11 are in Brooklyn, eight are in Queens, five are on Staten Island, four are in Manhattan, and three are in the Bronx.

The city grades public school cafeterias in the same way that it grades restaurants, but it doesn't convert the scores into publicly-accessible letter grades. In order for a cafeteria to obtain an "A" grade, it needs to score fewer than 13 points during its initial inspection. Cafeterias that score below an "A" can ask for re-inspection—if they fail to make the grade the second time around, they get a "B" if they score between 14 and 27 points or a "C" if they amass 28 or more points.

Ralph McKee Vocational High School in Staten Island scored a whopping 48 points, making it the dirtiest school cafeteria in the city. Brooklyn's P.S. 361 came in second place with 46 points, P.S. 16, also on Staten Island, was in third place with 44 points.

Inspectors found evidence of mice, flies, and roaches at all but eight of the 31 dirtiest schools. According to the report, mice-related violations are the most common of all vermin violations. In 2015-16, inspectors issued 442 mice-related violations to 320 different school cafeterias, the majority of them in Brooklyn.

Manhattan's Sixth Avenue Elementary School, however, had the most serious mice problem of all the schools inspected. In one inspection, the school was issued six different mice-related violations and inspectors found approximately 400 mice droppings throughout the school's cafeteria.

"The City preaches school safety over and over again, but as this report confirms, they overlook the most basic of safety concerns for our children," State Senator Tony Avella told Gothamist via email. "Parents should be able to send their children to school with the understanding that their children will return home in a better condition than when they left."

Department of Education spokesperson Toya Holness said the DOE will "work with the Department of Health to make the reports more easily accessible to the public."

A spokesperson from the Health Department told Gothamist that when compared to restaurants, public school cafeterias are relatively clean—85.6% of school cafeterias scored an A, while only 59% of city restaurants score that high.

"Letter grades at restaurants are popular because New Yorkers use them to choose where to eat, and that motivates the restaurants do to well," the spokesperson said. "Students can be confident that schools are serving food that is safe for them to eat."