Non-potable water may be used for which of the following applications?

Non-potable water is water that is not safe for human consumption but can be used for various applications where high-quality drinking water is not necessary. In the context of plumbing, using non-potable water for flushing water closets and urinals is a common practice.

This application is beneficial for conserving potable water resources, especially in areas where water might be limited or where there is a push for sustainable practices. Water used for flushing is typically sourced from greywater or reclaimed water, which has been treated to a level suitable for this purpose but is still not safe for drinking.

Flushing toilets and urinals with non-potable water helps to utilize water that has already been used in other household or industrial processes, thereby reducing overall fresh water demand without compromising hygiene in restroom facilities.

On the other hand, using non-potable water in kitchen sinks and other food-related applications is not advisable due to the high risk of contamination and food safety issues. Mop sinks might be an option for non-potable water usage in some cases, but they typically require potable water for sanitary cleaning practices. Fire protection systems typically require potable water to ensure the effectiveness and safety of fire suppression equipment.