How were the sampled domestic wells selected?
The domestic wells in this study were sampled for NAWQA ground-water studies that were parts of integrated assessments of the water resources within selected hydrologic systems across the Nation. The NAWQA study areas, account for more than half of the Nations population and water use. The ground-water studies represent typical hydrogeological settings within more regionally extensive aquifers used for water supply (principal aquifers). The wells were randomly located within the targeted sampling areas of the ground-water studies. The sampled wells represent typical aquifer conditions and were not focused in areas of known contamination.
