Drinking water may be obtained from surface water or groundwater. Treatment of drinking water is designed to eliminate pathogens and harmful chemicals. In the United States, total and fecal coliforms are the most commonly used indicator organisms.
■ Describe two methods of water testing.
■ Which would be more likely to cause illness, a water sample that tested positive for coliforms or one that tested positive for E. coli O157:H7?
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