Used as an indicator that other potentially harmful bacteria may be present3

Coliforms are naturally present in the environment; fecal coliforms and E. coli come from human and animal fecal waste.




Turbidity, a measure of water cloudiness, is used to indicate water quality and filtration effectiveness (e.g., whether disease-causing organisms are present). Higher turbidity is associated with higher levels of microorganisms such as viruses, parasites and some bacteria. These organisms can cause symptoms such as nausea, cramps, diarrhea, and associated headaches.

Soil runoff

Viruses (enteric)

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