What does the presence of coliform indicate?

The presence of coliform bacteria in water indicates potential contamination and the possible presence of pathogenic organisms. Coliforms are commonly found in the environment, including in soil and vegetation, but their presence in drinking water suggests that there may be a pathway for fecal contamination. This could point to the presence of harmful microorganisms that pose health risks, such as viruses or bacteria that can cause illness. Monitoring for coliform bacteria is a critical part of water quality assessments, as it serves as an indicator of the overall sanitary quality of the water, helping to ensure public health safety.

Options that suggest the water is safe for drinking, represent low water quality standards, or indicate normal levels of bacteria do not address the critical role that coliform presence plays in signaling potential health risks associated with water quality.