In 2002, the US Environmental Protection Agency (EPA) promulgated the final arsenic primary drinking water maximum contaminant level (MCL) of 10 micrograms per liter. In addition, some states have adopted even lower limits (5 micrograms per liter). Over the past decade, this regulation has prompted hundreds of municipalities to utilize numerous treatment technologies for the removal of arsenic. Among the various technologies available, the EPA identified adsorption with GFH Media from Evoqua Water Technologies as a Best Available Technology (BAT) for arsenic removal.