The water that is beneath Earth’s surface

A body of rock or sediment that stores groundwater and allows the flow of groundwater

The percentage of the total volume of a rock or sediment that consists of open spaces

The ability of a rock or sediment to let fluids pass through its open spaces or pores

An area in which water travels downward to become part of an aquifer

Suitable for drinking

A microorganism, another organism, a virus, or a protein that causes disease; an infectious agent.

An artificial body of water that usually forms behind a dam.

Pollution that comes from a specific site.

Pollution that comes from many sources rather than from a single specific site; an example is pollution that reaches a body of water from streets and storm sewers

The accumulation of pollutants at successive levels of the food chain