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.

Administration of Air and Water Resource and Solid Waste Management Programs, Groundwater & Lakes Pollution, Environmental policy, Water pollution control, United States. Geological Survey, Drinking water

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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.

Waste Management and Remediation Services, Water Pollution, Research, Water quality management, Southern California, Organic wastes

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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.

United States, Government domestic functions, Mining industry, Natural resources, Mineral industry

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