Do you have a different link that talks about that? The Wikipedia article says there were no health issues.
“Despite the cost and the number of personnel involved in the cleanup, traces of contamination remained forty years later. Snails were observed with unusual levels of radioactivity.[31] Additional tracts of land were also appropriated for testing and further cleanup. However, no indication of health issues has been discovered among the local population in Palomares.[29]”
It's kind of hard to believe that measurable affects were found among the snails but it hasn't contributed to a case of cancer here or there over the years.
Human cancer that is, although I do feel for the snails.
Palomares is in Spain. Fifty years later, it's still an issue for the people living there.