He’s flush with cash.

A NYCHA plumber who’s one of New York City’s highest-paid employees is in hot water after claiming he worked nearly 2,600 hours of overtime.

Plumbing supervisor Jakub Markowski, 41, faces an investigation by the city more than a year after The Post exposed him as New York City government’s biggest overtime hog, clogging his bank account with a staggering $332,000 in extra pay during the 2025 fiscal year.

A spokesperson said the city Department of Buildings opened a probe into Markowski — who drew a whopping $465,000 paycheck from the city — after receiving a complaint into his “business practices.”

Markowski, who lives in an upscale apartment building off the Rockaway Beach boardwalk, didn’t return a request for comment. His wife Elizabeth Markwowska, 63, perhaps unsurprisingly, said he was working.

“He works seven days a week,” she told The Post from their home Wednesday.

Plumbing supervisor Jakub Markowski, 41, is under investigation. Instagram/Jakub Markowski

Markowski also ran two private businesses – Super Plumbers Corp. NYC and Dynamic Blue Water Mechanical — as he drew his stinks-to-high-heaven paycheck from the  New York City Housing Authority, state records show.

In addition to the DOB investigation into Markowski’s business practices, officials said they also conducted a sweep of active plumbing jobs in which he was the permit holder to make sure they were completed safely.

The sweep found no violations, DOB officials said.

Markowski ranks as the fifth-highest-paid city employee, according to records and the Empire Center watchdog. 

Without his whopping  2,558 hours of overtime logged, Markowski’s gross regular pay during the 2025 fiscal year would have stood at a respectable $118,000.

He would have had to work an average of seven extra hours a day for 365 days straight to draw his outsize paycheck, the New York Times reported.

When The Post first uncovered Markowski’s exorbitant pay, officials with NYCHA attributed his outsize overtime to “extensive plumbing and heating demands that are mandated and monitored by law.”

Elizabeth Markwowska, Jakub’s wife, speaks to The Post. Dennis A. Clark for NY Post

NYCHA didn’t comment further Wednesday.

But questions over Markowski’s taxpayer-paid overtime and dual private sector plumbing businesses prompted a complaint from the Plumbing Foundation of New York nonprofit trade group, according to the Times report.

“Enabling one individual to run a private plumbing business while serving as a city plumbing supervisor and accruing more overtime than any other city employee is beyond wasteful, and it raises serious concerns about the integrity, safety and oversight of NYCHA’s building operations,” April McIver, the group’s executive director, told the Times.

The city’s Department of Investigation is scrutinizing Markowski, but wouldn’t specify whether their probe is focused on his overtime, business or both.

“This is an ongoing matter at DOI and we decline further comment,” a spokesperson said.

A woman in the Maspeth building that houses both businesses said she didn’t have any information. A small sign for Super Plumbers Corp. in the window listed Markowski’s name inside.

Markowski’s wife, Markwowska, said he kept someone else in charge at his two plumbing businesses.

She was unaware he was the city’s highest-paid plumber, or what he did with his money.

“He comes home late. He works overtime. He works very hard,” she said.

“He treats me like a woman. Very nice guy.”