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By bacteriologic standards, water for drinking (i.e., potable water) should be free of coliforms and enterococci and contain not more than 500 organisms per milliliter. The term "coliform," which refers to lactose-fermenting, enteric, gram-negative bacilli, is now obsolete except in sanitary bacteriology where these coliforms are used as "indicator" organisms. They are chosen because they are present chiefly in sewage and not elsewhere, are reasonably abundant, and are easy and inexpensive to grow.

(Morello. Laboratory Manual and Workbook in Microbiology: Applications to Patient Care, 9th Edition. McGraw-Hill Learning Solutions, 092007. 36).

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