Why must ice used for food storage be from a clear potable source?

Ice used for food storage must be sourced from a clear potable water supply primarily to avoid contamination from non-potable sources. Potable water is defined as water that is safe for human consumption. If the ice is made from non-potable water, it poses a significant health risk, as it can harbor pathogens, chemicals, or other harmful substances that could contaminate food and lead to foodborne illnesses.

Using ice from a clear potable source guarantees that it has been treated and meets safety standards, ensuring that the ice does not introduce any contaminants when it comes into contact with food. This practice is crucial in maintaining food safety and protecting public health aboard navy ships, where the potential for outbreaks can be heightened due to limited medical facilities and close quarters.

While the clarity of the water may be important in indicating safety, the most critical reason remains the necessity for the water to be potable, preventing any harmful organisms or substances from affecting food stored with the ice.