Maine is suing biochemical giant Monsanto for allegedly knowingly selling products containing harmful chemicals that have contributed to contamination in the state.

The latest lawsuit targeting the company over the manufacture and sale of products with polychlorinated biphenyls, also known as PCBs, was filed on Thursday in state court. It alleges that Monsanto knew about the danger of PCBs years before they were banned but continued to make and sell products containing them.

Monsanto, which is now owned by Bayer, said it discontinued production of PCBs five decades ago and never manufactured or disposed of PCBs in Maine.

The company also said it conducted hundreds of studies over the years on the safety of PCBs “and provided warnings to its customers based on the state-of-the science at the time.”

Vermont was the first state to sue Monsanto last year over PCB contamination of natural resources, followed by dozens of school districts in the state. Bayer agreed to pay $698 million to Oregon to end a lawsuit over PCB pollution in 2022.