YIKES! Metal Barrels Dumped Off the Coast of #LosAngeles Are Encircled by Mysterious White Halos—and Scientists Think They Finally Know Why
At least some of the barrels contain caustic alkaline waste, which has made the surrounding ecosystems inhospitable to most life forms, a new study suggests
Sarah Kuta - Daily Correspondent
September 12, 2025
Excerpts: "The barrels’ exact origins are murky. However, federal records from the Environmental Protection Agency [#EPA] show that from the 1930s to the early 1970s, government agencies allowed companies to dump various types of waste at 14 underwater sites off the coast of Southern California. For those four decades, manufacturers got rid of their #refinery waste, filter cakes and oil #drilling waste, chemical waste, garbage, #military explosives and #RadioactiveWaste at these dump sites."
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"Scientists were not able to identify the specific alkaline waste substances contained within the barrels. However, they point out that several industrial processes were known to produce alkaline waste, including #DDT manufacturing and oil refining, so the barrels might be linked to those.
"They also can’t estimate the full extent of the potential alkaline waste contamination. Roughly a third of the barrels identified so far have halos, but they don’t know if that ratio applies to all the barrels on the seafloor. Scientists also don’t know the exact number of barrels, though a previous estimate suggests there are more than 25,000.
" 'We don’t know how big the problem really is,' Gutleben tells the San Diego Union-Tribune.
"One thing seems certain: Given that the barrels were dumped more than 50 years ago and that they’re still having a major impact on the surrounding environment, the chemicals are likely here to stay. They represent a new type of “persistent pollutant” that takes a long time to break down, the researchers write in the paper.
" 'It could take several thousand years for the effects of caustic alkaline waste dumping in the San Pedro Basin to be resolved,' they add."
https://www.smithsonianmag.com/smart-news/metal-barrels-dumped-off-the-coast-of-los-angeles-are-encircled-by-mysterious-while-halos-and-scientists-think-they-finally-know-why-180987334/?utm_source=firefox-newtab-en-us
#ToxicWaste #WaterIsLife #OceanAreLife #CaliforniaCoast #Pollution #OilRefining #OceanPollution