In water quality testing, coliform bacteria are used as what?

In water quality testing, coliform bacteria are used as what?

• A. Pathogens
• B. Indicators
• C. Nitrifiers
• D. Algae

Answer: (B)

Coliforms are used as indicators of water quality because their presence signals potential fecal contamination. They’re commonly found in the intestines of warm-blooded animals, so detecting them in water suggests that fecal matter—and possibly enteric pathogens—could be present, even if those pathogens aren’t directly detected. They’re relatively easy and quick to measure with standard lab methods, making them practical screening tools for sanitary quality. They are not themselves pathogens (nor nitrifiers or algae), but their presence triggers further testing and corrective actions to protect public health.

Coliforms are used as indicators of water quality because their presence signals potential fecal contamination. They’re commonly found in the intestines of warm-blooded animals, so detecting them in water suggests that fecal matter—and possibly enteric pathogens—could be present, even if those pathogens aren’t directly detected. They’re relatively easy and quick to measure with standard lab methods, making them practical screening tools for sanitary quality. They are not themselves pathogens (nor nitrifiers or algae), but their presence triggers further testing and corrective actions to protect public health.