by Kitt Farrell-Poe, Lisa Jones-McLean, Scott McLean, March, 2010, College of Agriculture and Life Sciences, Cooperative Extension, The University of Arizona
Microorganisms in drinking water are responsible for most waterborne disease outbreaks. They are the most common disease-causing contaminant in private well water. Organisms known to cause disease include bacteria, protozoa, and viruses; some algae and helminths (worms) may also be capable of producing disease. These disease-causing organisms thrive in the intestines of warm-blooded animals. They are transmitted to drinking water if the feces of an animal contaminates a water supply that does not have suitable disinfection.
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