Evaluation of Contaminants in Private Residential Well Water Pavillion, Wyoming, Fremont County

摘要

On March 19, 2010 the United States Environmental Protection Agency (EPA) Region 8 requested that the Agency for Toxic Substances and Disease Registry (ATSDR) evaluate potential public health risks from contamination identified in domestic wells located in Pavillion, Fremont County, Wyoming. EPA sampled residential, municipal water supply, and temporary monitoring wells in two phases as a part of a site assessment conducted under the Comprehensive Environmental Response Compensation and Liability Act (CERCLA) authority. EPA Region 8s investigation was intended to determine whether constituents of concern were present in the wells, and if possible, to evaluate any potential sources, including the predominant activities in the area agriculture or gas development. Sources considered included agricultural use of pesticides and fertilizer, household impacts such as nitrates from septic tanks, and natural gas production and extraction activities. Based on EPAs request and the need to prioritize public health concerns, the exposure pathways examined in this health consultation are the ingestion of drinking well water and inhalation of contaminants from vapors while showering. Other potential exposure pathways exist for exposure to water contaminants, including watering livestock and irrigation of crops, which were not addressed in this health consultation. EPA continues to investigate groundwater in the Pavillion area. ATSDR recognizes that a need to reevaluate the findings of this report may emerge as additional data becomes available.