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Long-term trends in nitrate concentration in Iowa water supplies

Donald B. McDonald and Roger C. Splinter
Journal (American Water Works Association)
Vol. 74, No. 8, Organic Contaminants in Groundwater (August 1982), pp. 437-440
Stable URL: http://www.jstor.org/stable/41271300
Page Count: 4
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Long-term trends in nitrate concentration in Iowa water supplies
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Abstract

Long-term water quality studies of surface waters and groundwaters in Iowa have shown increases in nitrate concentrations in surface supplies and shallow wells. Nitrate concentrations in deeper wells have remained low and have exhibited no appreciable increases since 1950. The application of nitrogenous fertilizers to agricultural land appears to be the primary source of nitrates in water supplies.

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