Which of the Following Statements About Municipal Water Supply Treatment

Which of the following statements about municipal water supply treatment for safe human consumption is FALSE?

A) Surface water picks up many pathogenic and nonpathogenic microbes from rain water contamination
B) Animal feces are a source of many microbes contaminating reservoirs
C) Indicator microbes are usually fecal coliforms like E. coli that live in the colons of animals and suggest that more dangerous microbial contaminants could be present
D) The presence of indicator organisms confirms the presence of pathogenic contaminants