9707938d_Their_Potential_Health_Effects___Contaminant_in_Drinking_Water
[Contaminant] Total Coliforms (including fecal coliform and E. Coli) [MCL or TT1 (mg/L)2] 5.0%4 Not a health threat in itself; it is used to indicate whether other potentially harmful bacteria may be present5
Coliforms are naturally present in the environment; as well as feces; fecal coliforms and E. coli only come from human and animal fecal waste.
Overview of Contaminants & Their Potential Health Effects
Sources of Contaminant in Drinking Water