Mayor de Blasio is almost as tall as the tales he tells.

Like the one he repeated Monday on knowing nothing about NYCHA’s efforts to hide its lead-paint scandals.

“If anyone had presented to me along the way that these reports from the Department of Health were being contested, that would have been the day that we started the process of turning all that around,” the mayor said at a Bronx press conference.

In fact, he had mountains of evidence “presented” to him.

The Daily News, for example, wrote in April 2015 about the Housing Authority’s habit of contesting every positive lead test: When a 2-year-old who’d spent his whole life in a Brooklyn project tested positive, NYCHA performed a test and declared the apartment lead-free.

(Numbers revealed this week show that NYCHA contested 95 percent of the “positive” tests it received from the city Department of Health from 2010 to 2018; private landords challenged just 4 percent.)

And NYCHA also shared key info. As early as May 2016, e-mails obtained by The Post show, NYCHA officials briefed top levels of City Hall that 202 kids had tests showing elevated lead levels in 2010-2015.

In April 2016, it was revealed that then-NYCHA chief Shola Olatoye had lied about conducting apartment inspections, which the agency had stopped from late 2012 through May 2016; de Blasio still insisted on defending her.

Meanwhile, according to now-ex-Investigations chief Mark Peters, the mayor was busy begging him to quash reports of his administration’s failures, including what Peters calls one “late-night screaming call.”

Indeed, Peters charges that de Blasio fired him because of his work “in exposing waste, fraud or abuse in city agencies” from NYCHA to Correction Department boss Joe Ponte’s abuse of his taxpayer-paid car.

The mayor says “it’s just false” that he ever pushed Peters to withhold a report — it was just heated conversations.

Hey, why stop lying now?