Simply put, groundwater is water that is stored underground in aquifers—dirt, sand, and rock. This water is stored between the particles of matter underground. These moist areas can be found close to the Earth’s surface or as many as thousands of feet underground.
Then you discover a spring or other form of water seemingly coming from nowhere, the source is often groundwater. This underground water makes its way into natural lakes and rivers and is often pumped out by wells for drinking and irrigation supply.
Over half of U.S. residents get their drinking water from groundwater.
As more residents populate the United States, more water is pumped out of underground aquifers. One of the problems arise when runoff from agricultural and industrial waste infiltrates and pollutes our groundwater. However, the biggest and most dangerous threat is over-drawing this limited resource.
Over-drawing our groundwater is such a dangerous problem because farmers are given subsidized water at low prices. This in turn negates the push to conserve water and save water. As a result, many farmers use inefficient irrigation techniques simply because they are easier and cheaper than retrofitting their equipment and saving money.