I wonder if the southern Ca birds are viable because of debris they commonly ingest requiring surgery. N Ca and S Or has a more pristine environment, relatively speaking. I believe it's colorful plastics and such. I believe more require surgery from ingesting debris than from lead poisoning. Anyway, it doesn't seem sustainable in terms of counting as a safe population under ESA given the mass of humanity in close proximity. I believe Snake River, Upper Columbia, Grand Canyon, N. CA are better long term prospects.
Condors and Trash
Yes, condors, like other animals such as albatross, have been known to eat trash. In fact, trash ingestion was found to be the leading cause of death for wild condor nestlings in a study published in 2012 (Rideout et al., Journal of Wildlife Diseases). Why condors ingest trash is unknown, but condor biologists think nestlings are exposed to trash items that have been brought back to the nesting area intentionally by their parents. (If you are interested to learn more about this topic, look up this paper “Why do condors and vultures eat junk: The implications for conservation” by Houston D, Mee A, McGrady M. published in the Journal of Raptor Research volume 41, pages 235-238 2007.)
We have seen condor nestlings ingest items such as coins, bottle caps and even a light bulb filament!