(May 15, 2024, 1:19 PM EDT) -- LOS ANGELES — Pomona, Calif., has sued the Dow Chemical Co. and Shell USA Inc. in California federal court arguing that they are liable for groundwater contamination from 1,2,3-trichloropropane (TCP), which they “knowingly and willfully manufactured” when they knew or should have known that the toxic chemical pollutes drinking water supplies....