Sources of information for these facts include, but are not limited to, the United States Environmental Protection Agency and the American Water Works Association.


  • In a 100-year period, an average water molecule spends 98 years in the ocean, 20 months as ice, about two weeks in lakes and rivers, and less than a week in the atmosphere.
  • One gallon of water weighs about 8.5 pounds.
  • Water is the only substance on Earth found naturally in three different forms – solid, liquid and gas.


  • Humans can survive only 5 to 7 days without water.
  • The human body is made of 70% water and your brain is 95% water.
  • The average person loses 16 ounces of water from their body a day just by breathing.


  • The Earth has the same amount of water today as it did 3 billion years ago.
  • 1% of the Earth’s water is available for drinking, 97% is salt water and the remaining 2% is frozen in glaciers.
  • 75% of the Earth’s surface is covered with water.
  • About 35% of the Earth’s freshwater supply is found underground.


  • At five to ten gallons a minute, a 10-minute shower can use as much as 100 gallons of water.
  • If everyone in the United States flushed the toilet just one less time per day, we could save a lake full of water about one mile long, one mile wide and four feet deep.
  • Toilets use the most water in our homes.
  • If everyone in the United States used just one less gallon of water per shower every day, we could save some 85 billion gallons of water per year.
  • A dairy cow must drink four gallons of water to produce one gallon of milk.
  • A tomato is 95% water.
  • One gallon of gasoline can contaminate 750,000 gallons of water.
  • Americans drink more than 1 billion glasses of tap water per day.
  • 75% of a living tree is made of water.