A natural underground layer, often of sand or gravel, that contains water.
A natural underground layer, often of sand or gravel, that contains water.
The water that systems pump and treat from aquifers (natural reservoirs below the earth’s surface).
Water in its natural state, ground water or surface water, prior to any treatment for drinking.
An aquifer that supplies fifty percent or more of the drinking water of an area.
Water in its natural state, prior to any treatment for drinking. See finished water.
The water that systems pump and treat from sources open to the atmosphere, such as rivers, lakes, and reservoirs.
The land area from which water drains into a stream, river, or reservoir.