Potable water is water that is safe for human consumption: drinking, cooking, brushing teeth, and every other use where water enters the body. The word comes from the Latin for drinking, and in the water industry it is the standard technical term for finished drinking water. When operators, engineers, and regulators say potable, they mean water that has been treated, tested, and verified to meet the health-based standards that apply to public water supplies.
The distinction between potable and non-potable water organizes the entire drinking water profession. Source water drawn from a river, lake, or aquifer is not considered potable until it has passed through treatment and disinfection. Water systems also carry non-potable water for purposes like irrigation or industrial use, and keeping potable and non-potable systems strictly separated is a core operational responsibility, since any connection between them can put the public at risk.
For certification candidates, potable is a word to internalize early because exam questions and job descriptions use it constantly. Water treatment operators produce potable water; water distribution operators protect its quality on the way to the customer. Understanding what it takes to make water potable, and to keep it that way through miles of pipe, is the conceptual heart of both series on the drinking water side.
Related terms
| Raw water | Untreated source water entering a treatment plant from a river, lake, reservoir, or aquifer. |
| Water treatment | The processes that convert raw source water into safe drinking water, and the certification series covering them. |
| Water distribution | The network that delivers finished drinking water to customers, and the certification series for operating it. |
| Disinfection | The treatment step that inactivates disease-causing microorganisms in water or wastewater. |
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