Marine Corps Air Station Yuma (MCAS Yuma) occupies approximately 3,000 acres within the City and County of Yuma, Arizona. The City of Yuma, the nearest municipality, is located approximately one mile northwest of the Station. Both the City and the Station obtain their drinking water from the Colorado River through an irrigation canal. The City does not use groundwater for drinking water purposes. The nearest domestic groundwater well is approximately 0.8 mile downgradient from the Station.