A view of the Palos Verdes Coast where Montrose dumped DDT decades ago

RANCHO PALOS VERDES, CA - SEPTEMBER 22: An aerial view of the Palos Verdes Shelf Superfund site, an area of contaminated sediment off the Palos Verdes Peninsula and Palos Verdes Point. Montrose Chemical Corp. dumped DDT, originally developed as an insecticide, between 1947 and 1971, and covers about 17 square miles of the ocean floor near Rancho Palos Verdes Tuesday, Sept. 22, 2020. Montrose discharged millions of pounds of DDT into Los Angeles County sewers, which empties two miles offshore in the Palos Verdes Shelf. Concentrations of DDT and PCBs in fish found in the Palos Verdes Shelf area continue to pose a threat to human health and the environment. (Allen J. Schaben / Los Angeles Times via Getty Images)