It's not just toxic chemicals. Radioactive waste was also dumped off Los Angeles coast
Briefly

It's bad we have potential low-level radioactive waste just sitting there on the seafloor. It's worse that we have DDT compounds spread across a wide area of the seafloor at concerning concentrations.
Records show that from the 1940s through the 1960s, it was not uncommon for local hospitals, labs and other industrial operations to dispose barrels of tritium, carbon-14 and other similar waste at sea.
Read at Los Angeles Times
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