If you look at our U.S. Geological Survey (USGS) water-use data, you see it is presented in "million gallons per day" (Mgal/d). We will help you visualize how much a millions gallon is so you can better understand our water-use information.
• Water Science School HOME • Water Use topics •
A Million Gallons of Water -- How Much is it?
If you start browsing through USGS water-use information, you'll see water withdrawals and use are most often reported in "million gallons per day" (Mgal/d). You'll understand the data better if you can visualize how much a million gallons of water is. A good-sized bath holds 40 gallons, so a million gallons would be 25,000 baths. But, it might be easier to take a look at the pool and cube image.
If you were a swimming-pool builder and a customer asked you to build a pool that would hold a million-gallons, then they had better have a big yard! You would need to build a pool about 267 feet long (almost as long as a football field), 50 feet wide, and 10 feet deep. The cube on the right side shows you that 1 million gallons would form a cube that is 51.1 feet on each side.
Some helpful conversions:
- 1 Mgal/d = 1.547 cubic feet per second
- 1 Mgal/d = 694.4 gallons per minute
- 1 Mgal/d = 1.121 thousand acre-feet per year
- 1 million gallons = 3,785,412 liters
- 1 million gallons = 3.07 acre feet

How much do you think a million gallons (3,785,412 liters) of water weighs?
• At 8.34 pounds per gallon, a million gallons comes in at 8,340,000 pounds.
• At 1 kilogram per liter, 3,785,412 liters comes in at 3,785,412 kilograms.
Below are science topics related to water use.
Water Use Information by Topic
Freshwater Withdrawals in the United States
Below are publications related to water use.
Estimated use of water in the United States in 2015
Estimated use of water in the United States in 2010
- Overview
If you look at our U.S. Geological Survey (USGS) water-use data, you see it is presented in "million gallons per day" (Mgal/d). We will help you visualize how much a millions gallon is so you can better understand our water-use information.
• Water Science School HOME • Water Use topics •
A Million Gallons of Water -- How Much is it?
If you start browsing through USGS water-use information, you'll see water withdrawals and use are most often reported in "million gallons per day" (Mgal/d). You'll understand the data better if you can visualize how much a million gallons of water is. A good-sized bath holds 40 gallons, so a million gallons would be 25,000 baths. But, it might be easier to take a look at the pool and cube image.
If you were a swimming-pool builder and a customer asked you to build a pool that would hold a million-gallons, then they had better have a big yard! You would need to build a pool about 267 feet long (almost as long as a football field), 50 feet wide, and 10 feet deep. The cube on the right side shows you that 1 million gallons would form a cube that is 51.1 feet on each side.
Some helpful conversions:
- 1 Mgal/d = 1.547 cubic feet per second
- 1 Mgal/d = 694.4 gallons per minute
- 1 Mgal/d = 1.121 thousand acre-feet per year
- 1 million gallons = 3,785,412 liters
- 1 million gallons = 3.07 acre feet
Sources/Usage: Some content may have restrictions. Visit Media to see details.How much do you think a million gallons (3,785,412 liters) of water weighs?
• At 8.34 pounds per gallon, a million gallons comes in at 8,340,000 pounds.
• At 1 kilogram per liter, 3,785,412 liters comes in at 3,785,412 kilograms.
- Science
Below are science topics related to water use.
Water Use Information by Topic
Water is everywhere, which is fortunate for all of humanity, as water is essential for life. Even though water is not always available in the needed quantity and quality for all people everywhere, people have learned to get and use water for all of their water needs, from drinking, cleaning, irrigating crops, producing electricity, and for just having fun.Freshwater Withdrawals in the United States
The freshwater in the Nation's rivers, streams, creeks, lakes, reservoirs, and in underground aquifers are vitally important to our everyday life, and, indeed, to all life on Earth. - Publications
Below are publications related to water use.
Estimated use of water in the United States in 2015
Water use in the United States in 2015 was estimated to be about 322 billion gallons per day (Bgal/d), which was 9 percent less than in 2010. The 2015 estimates put total withdrawals at the lowest level since before 1970, following the same overall trend of decreasing total withdrawals observed from 2005 to 2010. Freshwater withdrawals were 281 Bgal/d, or 87 percent of total withdrawals, and salinAuthorsCheryl A. Dieter, Molly A. Maupin, Rodney R. Caldwell, Melissa A. Harris, Tamara I. Ivahnenko, John K. Lovelace, Nancy L. Barber, Kristin S. LinseyEstimated use of water in the United States in 2010
Water use in the United States in 2010 was estimated to be about 355 billion gallons per day (Bgal/d), which was 13 percent less than in 2005. The 2010 estimates put total withdrawals at the lowest level since before 1970. Freshwater withdrawals were 306 Bgal/d, or 86 percent of total withdrawals, and saline-water withdrawals were 48.3 Bgal/d, or 14 percent of total withdrawals. Fresh surface-wateAuthorsMolly A. Maupin, Joan F. Kenny, Susan S. Hutson, John K. Lovelace, Nancy L. Barber, Kristin S. Linsey