The Unregulated Contaminant Monitoring Rule, which is part of the Safe Drinking Water Act Legislation, directs states to develop sampling plans to identify contaminants of emerging concern that may merit future regulatory consideration as part of the US Environmental Protection Agency's (USEPA) Contaminant Candidate List (CCL) process. Many of the traditional analytical methodologies used for regulatory compliance, however, lack the sensitivity and selectivity needed to detect organic contaminants of anthropogenic origin. Recently, the US Geological Survey (USGS) developed analytical methods for the determination of more than 100 contaminants typically found in domestic, industrial, and agricultural wastewaters. Examples of these unregulated contaminants include pharmaceuticals, antibiotics, homones, personal care products, and various industrial and commercial products. These newly developed analytical methods have been used by the USGS in cooperation with the N.J. Department of Environmental Protection to evaluate the occurrence of contaminants of emerging concern in New Jersey's streams and drinking water supplies. Results from this study indicate that organic contaminants representing a broad spectrum of uses and origins can enter and persist in environmental waters and subsequently occur in finished drinking water supplies. This study provides information that will be useful for designing future monitoring efforts and for setting research and regulatory priorities. Includes abstract only.