What classification should water be given when coliform organisms are detected?

Water that has detectable coliform organisms is classified as unsanitary because the presence of these microorganisms indicates potential contamination. Coliform bacteria are generally used as an indicator of the microbiological quality of water; they suggest that there may be pathogens present that can cause illness. For potable (drinking) water, strict safety standards are in place, and any detection of coliform organisms breaches these standards, signifying that the water is unsuitable for human consumption.

Regarding other classifications: potable water must be free from harmful microorganisms and pollutants, which is why the presence of coliform disqualifies it. Clean water could imply general clarity and absence of sediment, but it does not account for microbial safety. Water safe for recreational use also requires adherence to safety standards, including microbiological limits, thus would likely also be considered unsanitary if coliform organisms are present. Therefore, the appropriate classification in the presence of coliform organisms is unsanitary, reflecting the potential health risks associated with consuming or coming into contact with such water.