What is the ppb level in drinking water that equates to the NOEL as defined by the NAS Committee?
EPA uses standard default conversion factors for body weight (70 kilograms) and tap water consumption (2 liters per day) to translate RfDs to drinking water equivalents in ppb. For most people in a population, these assumptions are conservative since most people do not drink this much water each day (i.e., 2 liters per day is the 84th percentile of the adult drinking water rate, meaning 84 percent of the population drinks less than this amount each day).
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