Coliform bacteria presence indicates what in water treatment?

The presence of coliform bacteria in water treatment serves as a crucial indicator of potential fecal contamination. Coliforms are a group of microorganisms commonly found in the intestines of warm-blooded animals, including humans. When they are detected in water, it raises significant concerns, as it suggests that fecal material may be present, which can harbor harmful pathogens and pose health risks to humans.

Monitoring coliform levels is a standard practice in water quality testing because it helps to assess the safety of drinking water and the effectiveness of water treatment processes. While coliforms themselves are not necessarily pathogens, their existence in a water supply indicates that there could be a pathway for pathogenic bacteria or viruses to enter, thus necessitating further investigation and potential remedial measures to ensure public health safety.

The other choices do not accurately reflect the meaning of coliform presence: good water quality is not indicated by coliforms; high nutrient levels relate more to issues like eutrophication; and excess filtration does not directly pertain to the significance of coliform presence.