Risk of nitrate in groundwaters of the United States - a national perspective
Article Abstract:
The US Geological Survey's National Water Quality Assessment Program was established to study the factors that affect nitrate contamination of the country's water supply. Input and aquifer vulnerability factors such as atmospheric sources, fertilizer, and soil drainage characteristics were mapped across states to predict patterns of potential nitrate risks. Results showed that some parts of the western, midwestern and northeastern US run a high risk of shallow groundwater contamination by nitrates due to factors such as well-drained soils, high nitrogen input, and low woodland to cropland ratios.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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Natural and anthropogenic nitrate contamination of groundwater in a rural community, California
Article Abstract:
Identification of the contributing factors to the contamination of groundwater supplies in rural communities is essential in the management of an area's water resources. Data from samples of groundwaters, rocks, and soil from Sierra Pelona Valley in Southern California reveals the presence of more nitrates from human sources than from natural ones. Data shows the presence of human wastes, animal wastes, and decay of vegetation. Natural sources of nitrates exist in the form of soil, nitrates and decay of natural vegetation, but are relatively lesser than anthropogenic sources.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
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Nutrients in groundwaters of the conterminous United States, 1992-1995
Article Abstract:
The U.S. Geological Survey's National Water Quality Assessment Program reports the presence of nitrate in 71% of groundwater samples collected from 50 sites all over the nation.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 2000
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