A New York City Housing Authority plumbing supervisor who earned one of the largest paychecks in city government is now under investigation after claiming nearly 2,600 hours of overtime while simultaneously being connected to two private plumbing companies, the NY Post reports.

Jakub Markowski, 41, has come under official scrutiny more than a year after he was identified as the city’s biggest overtime earner. During the 2025 fiscal year, he collected an eye-popping $332,000 in overtime alone, helping boost his total city compensation to approximately $465,000.

City officials confirmed that the Department of Buildings launched an investigation into Markowski after receiving a complaint regarding his “business practices.”

Markowski, who resides in a luxury apartment building near the Rockaway Beach boardwalk, did not respond to requests for comment. His wife, Elizabeth Markwowska, 63, said there was a simple reason for his absence.

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

State records indicate that while employed by NYCHA, Markowski was also associated with two private companies, Super Plumbers Corp. NYC and Dynamic Blue Water Mechanical.

As part of the Department of Buildings’ inquiry, inspectors reviewed plumbing jobs for which Markowski was listed as the permit holder to ensure the work met safety requirements.

According to city officials, the inspection found no violations.

Payroll records compiled by the Empire Center show Markowski ranked as the fifth-highest-paid employee in all of New York City government.

His regular salary for fiscal year 2025 totaled about $118,000 before overtime. The remaining hundreds of thousands of dollars came from an extraordinary 2,558 hours of additional work.

According to The New York Times, reaching that total would have required Markowski to average roughly seven hours of overtime every single day of the year.

When questions first arose about the enormous payout, NYCHA defended the overtime, saying it resulted from “extensive plumbing and heating demands that are mandated and monitored by law.”

The unusually large overtime payments, coupled with Markowski’s ties to two private plumbing businesses, eventually prompted the Plumbing Foundation of New York, a nonprofit trade organization, to file a formal complaint, according to The New York Times.

“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 has also opened a probe involving Markowski but has not disclosed whether it is examining his overtime claims, his private business activities, or both.

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

A resident of the Maspeth building where both plumbing companies are registered said she knew little about the businesses. A sign displayed in the window for Super Plumbers Corp. identifies Markowski by name.

Markowski’s wife said her husband had placed someone else in charge of operating the two companies.

She also said she had no idea he was New York City’s highest-paid plumber and did not know what he did with his earnings.

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

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