Quality of water from public-supply wells in the United States, 1993-2007
Subtitle: overview of major findings
By: by Patricia L. Toccalino and Jessica A. Hopple
Contributors: Hopple, Jessica A.; Geological Survey (U.S.)
Edition: 1st ed.
Series: Circular -- 1346; U.S. Geological Survey circular -- 1346.
Publisher: U.S. Geological Survey
Published: 2010
Place of publication: Reston, Va
Language: eng
ISBN-13: 9781411327801
Notes: Includes bibliographical references.
Table of contents: title: NAWQA's approach to assessing the quality of water from domestic wells; title: Major findings; title: More than one in five (22 percent) source-water samples from public wells contained one or more contaminants at concentrations greater than human-health benchmarks; title: Contaminants from natural sources accounted for about three-quarters of contaminant concentrations greater than human-health benchmarks in source-water samples; title: Contaminants that originate entirely or primarily from man-made sources accounted for about one-quarter of contaminant concentrations greater than human-health benchmarks in source-water samples and were detected in nearly three quarters of the samples, predominantly in samples from unconfined aquifers; title: Many organic contaminants detected in source water also were detected in finished water at similar concentrations; title: Human-health benchmarks are not yet available for many organic contaminants including some that were frequently detected in source water; title: Contaminants usually co-occured with other contaminants in source and finished water, and mixtures of two or more contaminants at concentrations greater than one-tenth of individual human-health benchmarks were dominated by inorganic contaminants; title: The most complex mixtures in source water, those with the greatest number of contaminants, were most often detected in samples from unconfined aquifers.