The Environmental Working Group (EWG)'s Tap Water Database reveals which states have water utilities that serve residents drinking water with levels of arsenic above the legal level outlined by the Environmental Protection Agency (EPA). According to EWG's database, in 29 states, one or more water utilities have levels of arsenic higher than the EPA's maximum contaminant level (MCL) of 10 parts per billion (ppb)—the level which the agency deems legal and acceptable based on cost, feasibility and