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Volatile organic compounds in the nation's ground water and drinking-water supply wells - a summary

National findings on the occurrence of 55 VOCs in ambient, untreated ground water are based on data collected or compiled as part of 98 aquifer studies within the NAWQA Program during 1985-2002 from about 3,500 wells that were selected randomly and distributed across broad areas. The aquifer studies were located throughout the conterminous United States as well as in Alaska and Hawaii. The NAWQA analysis was based on one sample per well. The resulting assessment provides an aquifer-scale resource characterization of the occurrence of VOCs. Findings can be used to make decisions regarding water-resource protection and water-supply management at regional and national levels.