Water Pollution (Environmental Issues) by Yael Calhoun, David Seideman

By Yael Calhoun, David Seideman

Simply because clean water is proscribed in provide, making sure that water us secure for human use and intake is an immense situation. With the growth of and the dumping of chemical compounds and different waste items, water resources became smaller and extra risky.

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Sample text

In the mostly agricultural Lower Tennessee River Basin, for example, 52 different pesticides were detected in streams and rivers, and VOCs were detected in about 67 percent of sampled springs and wells that tap underlying carbonate aquifers. Nationally, at least one pesticide was found in about 94 percent of water samples and in 90 percent of fish samples from streams, and in about 55 percent of shallow wells sampled in agricultural and urban areas. The type and concentrations of contaminants that are found in urban and agricultural water resources are closely related to the chemicals that are used (such as fertilizers and pesticides) or that are released with waste products (such as sewage or manure).

Water quality is most affected in watersheds with highest population density and urban development. In agricultural areas, 95 percent of tested streams and 60 percent of shallow wells contained herbicides, insecticides, or both. In urban areas, 99 percent of tested streams and 50 percent of shallow wells had herbicides, especially those used on lawns and golf courses. Insecticides were found more frequently in urban streams than in agricultural ones. The study also found large amounts of plant nutrients in water supplies.

Toward this end, county extension agents are educating farmers and homeowners about their proper application and the availability of nutrient testing. To curtail the use of expensive and potentially harmful pesticides, the approach known as integrated pest management can be implemented. It involves the identification of specific pest problems and the use of nontoxic chemicals and chemicalfree alternatives whenever possible. For instance, aphids can be held in check by ladybug beetles and caterpillars can be controlled by applying neem oil to the leaves on which they feed.

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