Got to love the EPA and their knee jerk reactions.
"Multiple public comment periods followed the ruling and the response from various facets of agriculture was overwhelming. The MSMA task force, an alliance of chemical companies that manufacture the product, and the cotton industry formulated a response. Concerns were raised on a number of issues about the ruling, particularly that no information was provided regarding the type of arsenic detected in the water (i.e., organic or inorganic), the source of the arsenic found, and that there was no way to conclusively say that the arsenic was from applications of MSMA."