When monitoring coliform bacteria, what is the significance of a positive test result?

A positive test result for coliform bacteria is significant because it indicates the potential presence of harmful microorganisms in the water supply. Coliform bacteria are used as an indicator of water quality, particularly concerning fecal contamination and the possible presence of pathogens. Since these bacteria are not harmful themselves, but their presence suggests that other dangerous organisms may also be present, additional sampling is essential to assess the extent of contamination and to evaluate the safety of the water.

Conducting further testing allows water operators to identify the specific source and type of bacteria present, determining whether remedial actions are necessary. This is crucial for ensuring that water remains safe for consumption and meets public health standards. If subsequent samples also show contamination, it may signal a more serious problem requiring further investigation or treatment strategies.