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Learn about the causes, effects, and solutions of water pollution in the US, including sewage, industry, agriculture, and urban runoff. Find out how the Clean Water Act regulates point source pollution and how nonpoint source pollution is more challenging to control.
Fluoride pollution from various industrial emissions can also contaminate water supplies. In a few areas of the United States, fluoride concentrations in water are much higher than normal, mostly from natural sources. In 1986, EPA established a maximum allowable concentration for fluoride in drinking water of 4 milligrams per liter (mg/L).
A partial list of major dams and reservoirs in the US, organized by state and with links to more information. Learn about the history, function, and impact of these water infrastructure projects.
Learn about the 50 states, the federal district, and the five major territories of the United States, their populations, areas, capitals, and histories. See a map, a table, and a series of articles on political divisions of the US.
The state’s underground storage capacity is estimated to be between 850 million and 1.3 billion acre-feet — significantly larger than the combined 50 million acre-feet in above-ground reservoirs.
The Ogallala Aquifer is a shallow water table aquifer beneath the Great Plains in the United States, one of the world's largest aquifers. See a map of its saturated thickness, regions of water level decline and increase, and groundwater withdrawal rates by county.
This is a list of rivers in the continental United States by average discharge (streamflow) in cubic feet per second. All rivers with average discharge more than 15,000 cubic feet per second are listed.
The inland waterways of the United States include more than 25,000 mi (40,000 km) of navigable waters, mostly in the eastern half of the country. The Mississippi River System is the most important waterway for ocean shipping and barge traffic, connecting Gulf Coast ports with major inland ports and the Great Lakes.