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Summary of the Public Health Goal for Dalapon

 

A Public Health Goal (PHG) of 790 ppb is developed for dalapon in drinking water. U.S. Environmental Protection Agency’s (U.S. EPA’s) Maximum Contaminant Level (MCL) is 200 ppb. Dalapon is not currently registered for use as a pesticide active ingredient in California. We calculated a PHG for dalapon of 790 ppb based on an adjusted no-observed-adverse-effect-level (NOAEL) of 8.45 mg/kg-day for increased kidney-to-body weight ratio in male rats, an uncertainty factor of 300 and a relative source contribution of 80%. Therefore, OEHHA calculates a PHG of 0.79 mg/L (790 ppb) for dalapon in drinking water.