Which of the following is NOT a typical use for non-potable field water?

• A. Showering
• B. Washing clothes
• C. Flushing toilets
• D. Drinking water

Answer: (D)

Non-potable field water is water that hasn’t been treated to meet drinking-water standards, so it’s used for tasks where ingestion isn’t involved. The point is to conserve potable water by using non-potable water for things like toilet flushing and laundry. Drinking water, on the other hand, must come from a potable source because it has to meet strict health and safety standards to avoid exposing people to pathogens and contaminants. That’s why drinking water is not a typical use for non-potable water—the very purpose of non-potable water is to avoid using it for consumption.