ly occuring metal and drinking water contaminant that enters tap water by corrosion of household plumbing systems and erosion of natural deposits.46.67 ppb120 ppbNo300 ppbNo1000 ppbFoaming agents (surfactants)Foaming agents (surfactants) are detergents or detergent-like substances used as cleaning agents in industrial and consumer goods such as personal care products; they are also used as inert i