https://twitter.com/kroesserstrat/status/861323503395647488/

As if the East River wasn’t toxic enough.

A Con Edison substation spewed gallons of oil into the polluted waterway — prompting a clean-up effort that delayed ferry commuters Tuesday, according to reports.

“The East River route will be subject to delays for the remainder of the day as a result of an oil spill on the East River,” NYC Ferry announced on Twitter.

Officials set up a “safety zone” blocking all water vessels from the area while cleaning up mineral oil that gushed from the company’s substation on John Street in DUMBO Sunday, Gothamist reported.

A “catastrophic” transformer failure caused a 37,000-gallon tank of dielectric fluid — mineral oil used to prevent electric discharges — to leak into the river at around 12:20 p.m. Sunday, Coast Guard Chief Warrant Officer Allyson Conroy told the site.

A Con Edison rep said the firm responded swiftly to the oil spill, which could be seen in the water as far away as Queens.

“Some oil entered the East River and Con Edison responded immediately, placing boom, absorbents and skimmers in the river. Our own employees and environmental contractors are working on the cleanup, and we are working cooperatively with the U.S. Coast Guard and the New York State Department of Environmental Conservation,” Con Ed spokesman Allan Drury said in a statement.

The company hadn’t said Tuesday how much of substance was released into the river, he said.

New Yorkers should expect East River ferry service all day Tuesday, according to NYC Ferry.

Ferries and boats are forbidden from entering the East River south of Dupont Street in Greenpoint and east of Brooklyn to East 25th Street in Manhattan and north of Buttermilk Channel.