It’s not just toxic chemicals. Radioactive waste was also dumped off Los Angeles coast – the Los Angeles Times
For decades, a graveyard of corroding barrels has littered the seafloor just off the coast of Los Angeles. It was out of sight, out of mind — a not-so-secret secret that haunted the marine environment until a team of researchers came across them with an advanced underwater camera…Startling amounts of DDT near the barrels pointed to a little-known history of toxic pollution…but federal regulators recently determined that the manufacturer had not bothered with barrels. (Its acid waste was poured straight into the ocean instead.)…
History of DDT ocean dumping off L.A. coast even worse than expected, EPA finds – Los Angeles Times
After an exhaustive historical investigation into the barrels of DDT waste reportedly dumped decades ago near Catalina Island, federal regulators concluded that the toxic pollution in the deep ocean could be far worse — and far more sweeping — than what scientists anticipated.