What characteristic of a water source distinguishes it from potable sources in emergency situations?

In emergency situations, a key characteristic that distinguishes a water source from potable sources is its nonpotability. Nonpotable water is not safe for human consumption due to potential contamination with pathogens, chemicals, or other hazardous substances. This characteristic is critical because, in emergencies, water sources may become polluted, misidentified, or overwhelmed with debris, making them unsuitable for drinking.

Understanding nonpotability is vital for public health measures, as it guides responders in determining which sources can be safely used for drinking, cooking, and hygiene purposes. The implications of using nonpotable water can lead to waterborne diseases, making it essential to prioritize safety assessments and treatments for any water intended for human use.