Which of the following statements is true concerning the presence of coliform organisms in drinking water?

The presence of coliform organisms in drinking water indicates a potential contamination of fecal origin, which can include pathogens that are harmful to human health. Therefore, when coliform bacteria are detected, the water is deemed unsafe for consumption and should be considered unsanitary. This reflects a significant public health concern, as these organisms serve as indicators for the possible presence of more dangerous microorganisms that can lead to gastrointestinal illness and other health issues.

While the other statements may contain elements related to drinking water, they do not accurately represent the health implications of coliform presence. The second statement precisely addresses the unsanitary conditions implied by coliform contamination, making it the most accurate choice in this context.