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The quality of our nation's waters : quality of water from public-supply wells in the United States, 1993-2007 : overview of major findings
- Author / Creator
- Available as
- Physical
Details
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- Creator
- by Patricia L. Toccalino and Jessica A. Hopple
- Format
- Books
- Language
- English
- Contributors
- Publication
-
- Reston, Va. : U.S. Geological Survey, 2010
- Physical Details
-
- v, 58 pages : illustrations (chiefly color), color maps ; 28 cm
- ISBNs
- 9781411327801, 1411327802
- OCLC
- ocn606053977
- Includes bibliographical references (pages 44-50).
- NAWQA's approach to assessing the quality of water from domestic wells -- Major findings -- More than one in five source-water samples from public wells contained one or more contaminants at concentrations greater than human-health benchmarks -- Contaminants from natural sources accounted for about three-quarters of contaminant concentrations greater than human-health benchmarks in source-water samples -- 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 two-thirds of the samples, predominantly in samples from unconfined aquifers -- Many organic contaminants detected in source water also were detected in finished water at similar concentrations -- Human-health benchmarks are not yet available for many organic contaminants including some that were frequently detected in source water -- 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 -- The most complex mixtures in source water, those with the greatest number of contaminants, were most often detected in samples from unconfined aquifers