More than half of the continental US is currently experiencing some level of drought, and about a quarter is in severe drought or worse. In recent years, the western and southwestern US has been in a seemingly continual state of reduced rainfall and snowpack. Droughts have many well-known, potentially catastrophic consequences, from crop failures to water shortages to wildfires. Yet they can also have more direct human health impacts by not only affecting how much water there is, but also the quality of that water.