Florida Wastewater Practice Test

What does the presence of coliform group bacteria indicate?

1. Presence of a high nutrient level

2. Presence of disease-producing organisms

3. Presence of heavy metals

4. Presence of organic matter

The correct answer is: Presence of disease-producing organisms

The presence of coliform group bacteria is important for assessing water quality, particularly in drinking water and wastewater. These bacteria are commonly found in the intestines of warm-blooded animals and can indicate fecal contamination. When coliform bacteria are detected in water, it suggests that there may be pathogens, or disease-producing organisms, also present, since they can originate from the same source (i.e., human or animal waste). The reason this is crucial for water testing is that coliforms serve as an indicator species; while they themselves may not always be harmful, their presence signals the likelihood that water may be contaminated with harmful microorganisms, putting public health at risk. Regular monitoring for coliforms helps ensure the safety of water supplies. On the other hand, while high nutrient levels, heavy metals, and organic matter are relevant factors in assessing water quality, they are not directly indicated by the presence of coliform bacteria. Nutrient levels and organic matter relate to the overall health of aquatic ecosystems and can contribute to different environmental issues like eutrophication, while heavy metals are specific pollutants with distinct sources and effects.