A 33-year-old Manhattan man leaned over into the North Pool at the 9/11 Memorial & Museum on Monday afternoon and survived with just a leg injury — but was awaiting criminal charges, according to police.

The NYPD responded to the World Trade Center site in lower Manhattan around 1:30 p.m. after a Port Authority cop spotted the man leap into one of the two tiered reflecting pools at the memorial – and climbed down to grab him, police and law-enforcement sources said.

Video shows the man lying down in the 18-inch-deep waters in the pool’s central basin, peering into the opening in the middle.

He then slowly slides head-first and drops 20 feet into the lower part of the pool as witnesses gasp in horror, according to footage obtained.

Police said he suffered an injury to his left leg and was taken to Bellevue Hospital, where he was in stable condition.

The man, whose name is being withheld pending criminal charges, was taken into custody.

It was not immediately known why the man jumped.

The pair of reflecting pools at the memorial site mark the former footprints of the two Twin Towers before they were felled during the Sept. 11, 2001, terror attacks and now honor those who died that day.