Which parameter indicates water turbidity and thus water clarity?

• A. Residual Disinfectant
• B. Turbidity
• C. pH
• D. Taste/Smell Indicators

Answer: (B)

Turbidity is the measure of how clear or cloudy water appears, caused by suspended particles like silt, clay, algae, or organic matter. This parameter directly reflects water clarity, which is why it’s used to gauge how transparent the water is. Higher turbidity means more light is scattered and blocked, which can affect aesthetics and indicate potential contamination. It also matters because suspended particles can shield microorganisms from disinfection, impacting treatment effectiveness. The other factors measure different properties: residual disinfectant shows how much disinfectant remains, pH indicates acidity or basicity, and taste/odor indicators reflect sensory changes but not cloudiness. So turbidity best indicates water clarity.