WASHINGTON, Sept. 29 -- The U.S. Department of the Interior Geological Survey issued the following abstract of an article: * * * Anthropogenic and geogenic factors affecting groundwater arsenic and potential drinking water exposure in the San Luis Valley, Colorado September 29, 2026 Groundwater arsenic is a serious health threat in many regions with limited surface water drinking supplies. In the San Luis Valley, Colorado, USA, where most residents rely on groundwater for drinking water, elevated groundwater arsenic concentrations (>-5 ug/L more PR