Abstract
The US Environmental Protection Agency must set a limit for perchlorate in drinking water, a federal appeals court ruled May 9 . The ruling restarts the clock for the EPA to propose regulations to control the chemical under the Safe Drinking Water Act (SDWA). The EPA determined in 2011 that perchlorate in drinking water should be regulated. The chemical, which is used to make rocket fuel, military weapons, and fireworks, inhibits the thyroid from taking up iodine. A lack of iodine during pregnancy is linked to abnormal brain development in the fetus, and iodine deficiency in lactating people is associated with neurodevelopmental problems in their children. But the EPA never proposed a perchlor- ate drinking-water regulation. In 2020, under the administration of Donald J. Trump, the agency decided it didn’t need to regulate the chemical . The EPA has long faced pressure from other federal agencies, including the Department of
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