Disinfection Of Drinking Water

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"There are various ways in which drinking water supplies can become contaminated. The two major sources for drinking water are surface water and ground water. About half of the nation's water supplies are provided by ground water (3:39). In rural areas, this figure is as high as 97 percent, because most of the water in those areas is obtained directly from the ground through wells (6:61). Both of these sources are subject to contamination. For example, surface water is contaminated by the chemicals, pesticides and other pollutants which are dumped into the nation's rivers and lakes. Ground water is contaminated by waste from landfills and also by leakage from hazardous-waste sites (6:61). The Environmental Protection Agency (EPA) is aware of the "serious health risk" which is posed by this situation and has issued strict standards for the reduction of contaminants in ..."

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