Which of the following is TRUE about total coliforms and E. coli?

The statement that detection of E. coli probably indicates contamination from sewage is accurate because E. coli is a type of fecal coliform bacteria that originates primarily from the intestines of warm-blooded animals, including humans. When E. coli is found in water, it is a strong sign that fecal contamination has occurred, suggesting that the water may harbor pathogenic microorganisms often found in sewage. This makes E. coli a key indicator in water quality assessments, particularly for drinking water safety.

While detecting total coliforms indicates general microbiological contamination potentially from various sources, the presence of E. coli adds a layer of specificity linked to fecal waste. Hence, finding E. coli in a water sample is more concerning and implies a higher risk regarding the potential for pathogens that could lead to illness.

The other statements provide different perspectives on coliform detection, but none emphasize the direct correlation between E. coli and sewage contamination as effectively as this one.