CDC provides guidelines on suspect water supplies. Centers for Disease Control and Prevention.
D017088:AIDS-Related Opportunistic Infections / Q000453:epidemiology* / Q000276:immunology; D000328:Adult; D002487:Centers for Disease Control and Prevention, U.S.; D002648:Child; D003457:Cryptosporidiosis / Q000453:epidemiology* / Q000635:transmission; D016785:Cryptosporidium parvum / Q000302:isolation & purification*; D004196:Disease Outbreaks / Q000517:prevention & control*; D006266:Health Education; D006801:Humans; D016867:Immunocompromised Host / Q000276:immunology; D007223:Infant; D014481:United States / Q000453:epidemiology; D014871:Water Microbiology; D014881:Water Supply / Q000592:standards*