The earth is estimated to hold about 1,460,000,000 cubic kilometers of water. The breakdown of where all that water resides is estimated as follows:
Since 1950, the USGS has collected and analyzed water-use data for the United States and its Territories. That data is revised every 5 years.
The water cycle, also known as the hydrologic cycle, describes the continuous movement of water on, above, and below the surface of the Earth.
Most states have set fish (and wildlife) consumption advisories and recommended consumption levels. The state agency responsible for these limits varies.