The janitor allegedly saw a video of him disposing of household rubbish at work

A school janitor who commutes to work from Pennsylvania uses his Washington Heights public school as his personal trash can — all to save a few bucks, a whistleblower told The Post.

Juan Acosta – who lives 75 miles away in Stroudsburg – routinely arrives at PS 48 early Monday mornings with giant bags of trash that he dumps outside his workplace and stunning videos filmed by the whistleblower show over the past four years.

In footage captured by the source using his smartphone and reviewed by The Post, Acosta, 54, can be seen pulling up to the elementary school at West 186th Street and Broadway on 11 separate occasions since February 2019 – including three times in the last two months – and then opening the trunk and back seat of a black Hyundai Elantra to pull out white plastic bags of trash.

The janitor, who starts his shift around 6am, usually looks around to see if anyone is watching, and then blithely dumps the bags and loose trash at the curb, where the school’s trash is already piling up.

To add insult to injury, Acosta illegally parks next to a fire hydrant or along a crosswalk to do the unauthorized drop-offs. He then stalks back to his vehicle and makes an illegal U-turn to head for a parking lot, the videos show.

The whistleblower also provided The Post with photos of debris pulled from Acosta’s garbage bags – including private mail from the manager’s home address.

In Stroudsburg, community residents pay about $33 a month to have their trash picked up or to take it to a landfill themselves.

The whistleblower accused Acosta, who earns $133,864 annually and pocketed nearly $160,000 in overtime in 2021, of being so “cheap” and “obnoxious” that he appears to be hauling trash across three states to save $400 a year.

The tipster said he waited four years because he wanted to amass enough evidence so Acosta couldn’t talk his way out of disciplining. He claimed that Acosta illegally dumped garbage on many other occasions that he did not record.

“He thinks he’s untouchable – and that nothing applies to him,” he said. “That’s the air he carries – even at work.”

Acosta denied any wrongdoing, claiming he was simply moving trash from a nearby public school to PS 48. He blurted out, “That’s all I have to say,” before hanging up.

The whistleblower called his apology “a blatant lie” and said there was “no point” in transporting rubbish from one school to another in his private car.

The city sanitation department confirmed that it collects garbage and recyclables at all city schools.

After the videos were shown by The Post, Joshua Goodman, a spokesman for the Sanitation Department, said the agency’s law enforcement officers would review them. “An investigation is ongoing,” he said.

“Illegal dumping is a crime – a theft of public space and a disregard for our neighborhood,” he added.

Violators face a minimum fine of $4,000 and an illegal dump truck vehicle may be impounded.

The Department of Education did not respond to requests for comment, but referred the videos to the Special Inquiry Officer for city schools, sources said.

Sanitation Commissioner Jessica Tisch has made illegal dumping a “signature problem,” Goodman said.

“We now have about 50 cameras across the city at known landfill hotspots, and we’re capturing people pretty much every day.”