New York City jail leaders haven’t been addressing “pervasive dysfunction” in the system — and the troubling situation hasn’t been getting any better under the Adams administration, the feds charged in a scathing new report.

The federal monitor overseeing Rikers Island sounded the alarm about about a “disturbing level of regression” at the lockup in its report filed Monday — that asks a federal judge to threaten to hold the Department of Correction in contempt as a way to force it to comply.

The 300-page filing in Manhattan federal court is the latest volley in an escalating back-and-forth between monitor Steve Martin and DOC Commissioner Louis Molina over rampant violence and excessive use of force in city lockups.

“There is no question that some progress has been made,” Martin wrote about the last nearly eight years of oversight, “but many of the initiatives required by the Action Plan remain incomplete or have not been addressed, and worse, there has been a disturbing level of regression in a number of essential practices.”

“The pace of reform has stagnated instead of accelerated in a number of key areas,” the monitor wrote.

The damning report continues to slam the DOC for an “inability or unwillingness to identify the objective evidence regarding the pervasive dysfunction and harm that continues to occur daily in the jails.”

Martin asks the judge to start the process of holding the city in contempt to “coerce compliance” — and suggests that further action should be necessary.

The troubled city jail system has recently been under threat of a federal takeover, which would be an extraordinary move.

In May, the monitor issued a special report, also a rare step, in which it slammed the DOC for its handling of five violent incidents over a six-day span of time and the agency’s lack of communication with the monitor in the hours and days following.

Molina had suggested that the monitor shelve the special report, saying it would cause “great harm [to the department] at a time when we are making great strides.” But Martin refused and issued the report in late May.

The DOC did not immediately respond to a request for comment Monday.