Nonpotability

Part of speech: noun

Definitions

1. The quality of being unfit for human consumption, particularly in reference to water or beverages
2. Describing a substance that poses health risks and should not be ingested
3. Characterizing liquids or materials that fail to meet safety standards for drinking purposes

Etymology: "Nonpotability" is a straightforward formation rather than a historical curiosity: it is built from the English prefix "non-", meaning "not," attached to "potability," which itself comes from "potable." That adjective entered English in the 15th century from Old French "potable," borrowed from Late Latin "potabilis," a derivative of Latin "potare," "to drink." Its original sense was simply "drinkable," and the word was used for liquids generally, not only water. The suffix "-ity" turns the adjective into a noun meaning a state or quality, so "potability" names the quality of being fit to drink. Adding "non-" reverses it, giving the quality of not being fit to drink. The compound is a modern technical-style noun, most common in water-quality reports, public health notices, and regulatory language, where "non-potable" is used to mark water that must not be consumed.