What is the optimal turbidity goal for finished drinking water?

The optimal turbidity goal for finished drinking water is set at 0.1 NTU. This target is established based on health guidelines and the need to ensure the safety and aesthetic quality of drinking water. Turbidity, which refers to the cloudiness or haziness of water caused by large numbers of individual particles, can indicate the presence of pathogenic microorganisms. Maintaining a turbidity level at or below 0.1 NTU minimizes potential health risks and ensures that the water meets the standards required for safe consumption.

This turbidity level is recommended because it provides a clear indication of the water's filtration and treatment effectiveness. It also helps to prevent the growth of microorganisms, which can flourish in higher turbidity conditions. By striving for this low turbidity goal, water treatment facilities can effectively protect public health while also ensuring that the water is visually appealing and palatable.

Other options present higher turbidity levels that do not align with the strict safety and health standards set by regulatory agencies, which aim to minimize health risks associated with drinking water contamination.