John S. Zogorski Paul J. Squillace Michael J. Moran 2002 <p><span>Groundwater is an important and valuable resource in the U.S. To some extent, groundwater is used in all 50 states to provide drinking water. In 1995, more than 50% of the population, more than 130 million people, relied on groundwater for drinking water supplies (Solley et al., 1998). About 30%, or 42 million, of these people obtained their water from privately owned wells (U.S. Geological Survey [USGS], 1999). The remaining 90 million people relied on groundwater from public water suppliers for their drinking water.</span></p> application/pdf en Lewis Publishers MTBE in groundwater of the U.S.: Occurrence, potential sources, and long-range transport chapter