As a lead-paint crisis engulfed New York City’s public housing system last year, Mayor Bill de Blasio defended his administration by repeatedly pointing to data showing that the number of children citywide with high levels of lead in their blood was actually at historic lows.

On Thursday, however, the city’s comptroller issued a scathing report detailing how the city did not check for lead paint at 9,099 private residential buildings where 11,168 children tested positive for high levels of lead between 2013 and late 2018.

While the city’s Department of Health had compiled the children’s addresses, it never shared them with the housing department tasked with inspecting for lead, the report said.