The beleaguered Administration for Children’s Services has failed to deliver its annual report by the city’s deadline, an oversight mandate created by Bill de Blasio when he was a city councilman.

The ACS-reporting law was designed to provide detailed information of the agency’s work to both to the public and to the City Council.

The annual report was due by Feb. 14.

The agency’s quarterly report, due by Jan. 31, is also tardy.

The stat-heavy quarterly reports including the average caseload of ACS workers, the experience levels of staff and the number of the abuse and neglect reports are to go to the City Council Speaker.

“We’re finalizing the report and expect to post it shortly,” a de Blasio spokeswoman said.

An independent, state-mandated monitor, was named last month to oversee ACS after the recent deaths of several children including Zymere Perkins, 6, who was bludgeoned with a broomstick in September.

At the time of Zymere’s death, the average caseload per child protective specialist in Manhattan was 10.19, according to the third quarter report from ACS, the latest available. The city has said it wants to keep the caseload below 12 per worker.

ACS is under similar scrutiny now as it was in 2006 when 7-year-old Nixzmary Brown was beaten to death by her father. At the time, de Blasio sponsored the reporting law as chairman of the council’s General Welfare Committee.

The horrific death of the Brooklyn tot, who had been under the watch of ACS, led to a shakeup of the agency.