What is the primary concern when using a non-potable water source to fill a potable water truck?

The primary concern when using a non-potable water source to fill a potable water truck is the risk of contaminating the aircraft's potable water system with harmful bacteria, viruses, parasites, or chemicals, potentially causing illness among passengers and crew. Non-potable water is water that is not safe for human consumption because it may contain contaminants that can pose a health risk. Even if the non-potable water appears clean, it may still harbor pathogens or toxins that can cause waterborne diseases. Introducing non-potable water into the aircraft's potable water system can compromise the safety of the entire water supply, potentially affecting a large number of people. Therefore, it is essential to use only approved potable water sources to fill potable water trucks and to follow strict sanitation procedures to prevent contamination.