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Assessment Guidance for Perchlorate Published 2006
This guidance replaces previous Office of Solid Waste and Emergency Response guidance regarding perchlorate under the National Oil and Hazardous Substances Contingency Plan, 40 CFR Part 300. Following the National Academy of Sciences' National Research Council review, EPA adopted a reference dose (RfD) for perchlorate of 0.0007 milligram/kilogram-day (mg/kg-day), and this guidance applies that to EPA's CERCLA program. This RfD leads to a Drinking Water Equivalent Level (DWEL) of 24.5 micrograms/liter (ug/L) or 24.5 parts per billion (ppb).
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