The Santa Susana Field Laboratory (SSFL) in Ventura County, California, is one of the most contaminated sites in the state. During its nearly 60 years of operation, the nuclear reactor and rocket testing site experienced several accidents—including a partial nuclear meltdown in 1959—that polluted the soil and groundwater with radioactive and chemical waste.

Since the SFFL was declared a superfund site in 1989, researchers have been working to understand the risk it poses to public health. Previous investigations focused on cancer incidence among residents living within 5 miles (8 kilometers) of the site, but a study published today in the…

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