If a well is pumped at a faster rate than the aquifer around it is recharged by precipitation or other underground flow, then water levels in the well can be lowered. Droughts, seasonal variations in rainfall, and pumping affect the height of the under groundwater levels. The water level in the aquifer that supplies a well does not always stay the same. How does the water level in my well change? It provides drinking water for more than 98 percent of the rural population who do not get their water delivered to them from a county/city water department or private water company. Groundwater is the source of about 33 percent of the water that county and city water departments supply to households and businesses ( public supply). Groundwater, which is found in aquifers below the surface of the Earth, is one of the Nation's most important natural resources. If dry weather persists and water-supply problems develop, the dry period can become a drought. When rainfall is less than normal for several weeks, months, or years, the flow of streams and rivers declines, water levels in lakes and reservoirs fall, and the depth to water in wells increases. Groundwater decline is a real and serious problem in many places of the Nation and the world. Likewise, many aquifers, especially those which don't have abundant recharge, are affected by the amount of water being pumped out of local wells.
Groundwater levels first are dependent on recharge from infiltration of precipitation so when a drought hits the land surface it can impact the water levels below ground, too. The water levels in aquifers is not often a constant. The time lapse video showing drought in the western United States.
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