Introduction The U.S.A. government mandates that all suppliers of water must test their water supply for contaminants yearly. Water companies run tests constantly checking for contaminants in the reservoir (main water supply) their water comes from. There are many types of water contaminants. Looking for an indicator organism, an organism that is only present when certain contaminants are present, checks for most water contaminants. (Evans, 2001, p. 8) Water-borne diseases are one type of contaminant …showed first 75 words of 656 total…

…showed last 75 words of 656 total…