Abstract
The Trump administration is proposing several options for limiting perchlorate in drinking water, including leaving the chemical unregulated. Perchlorate interferes with thyroid metabolism, which can damage the nervous system of infants and young children. More than 16 million US residents have perchlorate in their drinking water. The substance is used in solid rocket propellant, fireworks, vehicle-airbag inflators, and flares. The US Environmental Protection Agencyproposed on May 23 to set a maximum contaminant level of 56 parts per billion of perchlorate in drinking water. In contrast, California set its maximum contaminant level for perchlorate at 6 ppb in 2007. In its proposal, the EPA is seeking feedback from the public on a limit of 56 ppb plus three other regulatory options: a limit of 18 ppb, a limit of 90 ppb, or simply not regulating perchlorate in drinking water. Eric Olsen of the Natural Resources Defense Counsel, an environmental group that
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