Oil refineries are dumping massive amounts of toxic chemicals and heavy metals into the Great Lakes and the nation’s rivers with little, if any, oversight from government regulators, according to a new analysis that found some of the worst polluters are in the Chicago area.

During 2021 alone, 81 refineries in the United States that treat waste on-site released 1.6 billion pounds of chlorides, sulfates and other dissolved solids harmful to fish and other aquatic life, the nonprofit Environmental Integrity Project determined in its review of federal data.

The refineries also collectively discharged 60,000 pounds of selenium, an element that can mutate fish, and 15.7 million pounds of nitrogen, which contributes to water-fouling algae blooms and dead zones in important fisheries such as the Great Lakes, Chesapeake Bay and the Gulf of Mexico.

Most of the refineries are in low-income, predominantly Black and Latino communities that face disproportionate health risks from industrial pollution.

Some refinery pollution is legal because federal and state officials have failed to limit it, despite requirements in the 1972 Clean Water Act mandating a review of standards for various chemicals and metals at least every five years based on the latest science and improvements in water treatment technology.

“You have refineries that may look like they are complying with the law, but the standards are decades old and really don’t require very much,” said Eric Schaeffer, the group’s executive director and former chief of civil enforcement at the U.S. Environmental Protection Agency.

Three Chicago-area refineries — BP Whiting in Indiana, ExxonMobil Joliet and Citgo in Lemont — highlight the consequences of lax regulations and weak enforcement, Schaeffer said Thursday during an online news conference.

Even when limits are in place, oil companies often pay minimal fines for violating the law. Some aren’t penalized at all.

The Joliet refinery, on the Des Plaines River southwest of the city, exceeded its permitted levels of pollution 40 times between 2019 and 2021, federal records show. Neither federal nor state officials have sued ExxonMobil or fined the company for its repeated infractions.

Only three other refineries discharged more selenium than BP Whiting, located on the southwest shore of Lake Michigan about 8 miles from one of Chicago’s water intake cribs. Small doses of the element are healthy, but higher levels can cause hair and nail loss, gastrointestinal distress, dizziness and tremors.

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