JACKSON, Wyo. (Part 1 in a series of articles) — The groundwater in the Snake River Aquifer has been designated as a Sole Source Aquifer by the Environmental Protection Agency (EPA). It supplies drinking water for nearly the entire population of Teton County, and no alternative drinking water sources are available if it becomes contaminated. A substantial body of evidence confirms our aquifer is being contaminated, and many Teton County public drinking water systems lack basic protections to keep the water safe.