Reviewed By Elizabeth Klodas, MD, FACC 13 Million Americans Are Exposed to Dangerous Levels of Arsenic Through Drinking Water Exposure to arsenic, typically through drinking water, is linked to diabetes, according a study published in the Journal of the American Medical Association. Thirteen million Americans — and millions more worldwide — are exposed to drinking water contaminated with more inorganic arsenic than the Environmental Protection Agency has deemed safe. The EPA standard is 10 micrograms per liter. Researchers, led by Ana Navas-Acien, MD, PhD, of the Johns Hopkins Bloomberg School of Health, studied 788 adults who had their urine tested...