The company said the case "lacks merit." Democratic Gov Jay Inslee and Attorney General Bob Ferguson announced the lawsuit at a news conference in downtown Seattle Thursday, saying they expect to win hundreds of millions or even billions of dollars from the company.
"It is time to hold the sole US manufacturer of PCBs accountable for the significant harm they have caused to our state," Ferguson said, noting that the chemicals continue to imperil the health of protected salmon and orcas despite the tens of millions of dollars Washington has spent to clean up the pollution.
The suit arrives just days before Monsanto shareholders vote whether to accept a USD 57 billion buyout offer from Germany's Bayer.
The extraordinary meeting of shareholders takes place just outside of St Louis on Tuesday.
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PCBs, or polychlorinated biphenyls, were used in many industrial and commercial applications, including in paint, coolants, sealants and hydraulic fluids. Monsanto, based in St Louis, produced them from 1935 until Congress banned them in 1979.
According to the US Environmental Protection Agency, PCBs have been shown to cause a variety of health problems, including cancer in animals as well as effects on the immune, nervous and reproductive systems.
PCBs have not been produced in the US for four decades, and Washington is now pursuing a case on a contingency fee basis that departs from settled law both in Washington and across the country. Most of the prior cases filed by the same contingency fee lawyers have been dismissed, and Monsanto believes this case similarly lacks merit."
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