Hydration Statistics 2026: 33 Facts From Government Data

The official US reference values, and what they actually measure.

1. 91 fl oz

   The National Academies set the Adequate Intake for adult women at 2.7 liters (about 91 fl oz) of total water a day, counting water from food as well as drinks.

   National Academies of Sciences, Engineering, and Medicine, 2005Copy statLink

2. 125 fl oz

   Adult men’s Adequate Intake is 3.7 liters (about 125 fl oz) of total water a day, about 3.0 liters (101 fl oz) of it from beverages.

   National Academies of Sciences, Engineering, and Medicine, 2005Copy statLink

3. ~9 cups

   About 2.2 liters (74 fl oz, roughly 9 cups) of a woman’s 2.7-liter daily Adequate Intake is expected to come from beverages, including plain water.

   National Academies of Sciences, Engineering, and Medicine, 2005Copy statLink

4. 20%

   About 20% of the water people take in comes from food rather than drinks, according to the National Academies.

   National Academies, 2004Copy statLink

5. 101 fl oz

   During pregnancy the Adequate Intake rises to 3.0 liters (about 101 fl oz) of total water a day, about 2.3 liters (78 fl oz) of it from drinks.

   National Academies of Sciences, Engineering, and Medicine, 2005Copy statLink

6. 128 fl oz

   While breastfeeding, the Adequate Intake is 3.8 liters (about 128 fl oz) of total water a day, about 3.1 liters (105 fl oz) of it from drinks, and 1.1 liters (37 fl oz) more than for other adult women.

   National Academies of Sciences, Engineering, and Medicine, 2005Copy statLink

7. 6 L+

   Very active people in hot weather often need 6 liters (about 200 fl oz) or more of total water a day, the National Academies note.

   National Academies, 2004Copy statLink

8. 35%

   US guidance for women’s total water (2.7 liters a day) is 35% higher than Europe’s (2.0 liters a day).

   Both are total water from food and drinks; EFSA’s value assumes moderate temperature and activity. Our calculation: 2.7 ÷ 2.0 = 1.35.

   National Academies of Sciences, Engineering, and Medicine, 2005 · European Food Safety Authority, 2010Copy statLink

What federal surveys show people actually consume.

1. 44 oz

   US adults drink an average of 44 ounces of plain water a day, about 5½ cups.

   Adults 20 and older, NHANES 2015–2018. Plain water: tap, fountain, cooler, bottled and spring water. Other drinks and food also supply water.

   Centers for Disease Control and Prevention, 2024Copy statLink

2. 36 oz

   Adults 60 and older drink the least plain water of any age group, 36 ounces a day on average, against 51 ounces for adults 20 to 39.

   NHANES 2015–2018. The difference is statistically significant (CDC).

   Centers for Disease Control and Prevention, 2024Copy statLink

3. 23 oz

   US children and teens drink an average of 23 ounces of plain water a day; teens 12 to 19 drink 31.

   Ages 2–19, NHANES 2015–2018.

   Centers for Disease Control and Prevention, 2024Copy statLink

4. 93 fl oz

   US women aged 20 and over took in an average of 2.75 liters (about 93 fl oz) of total water a day from food and drinks in 2009–2012.

   NHANES 2009–2012; excludes pregnant and breastfeeding women.

   CDC National Center for Health Statistics, 2016Copy statLink

5. 117 fl oz

   US men aged 20 and over took in an average of 3.46 liters (about 117 fl oz) of total water a day from food and drinks in 2009–2012.

   CDC National Center for Health Statistics, 2016Copy statLink

6. 85 fl oz

   Women 60 and older averaged 2.51 liters (about 85 fl oz) of total water a day, the lowest of any adult women’s age group.

   NHANES 2009–2012. Women 20–39 averaged 2.78 liters and women 40–59 2.90 liters.

   CDC National Center for Health Statistics, 2016Copy statLink

7. 34%

   Plain water made up only 34% of US women’s total daily water intake (food and drinks combined) in 2009–2012, and 30% of men’s.

   CDC National Center for Health Statistics, 2016Copy statLink

8. 51%

   Water accounted for 51.2% of all the nonalcoholic beverages US adults aged 20 and over drank in 2015–2018.

   NHANES 2015–2018. Women: 54.0%; men: 48.2%.

   CDC National Center for Health Statistics, 2020Copy statLink

9. 7%

   In a national survey, 7% of US adults said they usually drink no bottled or tap water at all in a day.

   Food Attitudes and Behaviors Survey (National Cancer Institute), 3,251 adults 18+, October–December 2007; self-reported usual intake. Published 2013.

   CDC, Preventing Chronic Disease, 2013Copy statLink

10. 1 in 2

    About half of US adults aged 20 and over (49%) drank at least one sugar-sweetened beverage on a given day in 2011–2014.

    NHANES 2011–2014. Women: 45.1%; men: 53.6%.

    CDC National Center for Health Statistics, 2017Copy statLink

11. 63%

    Nearly two in three US children and teens aged 2–19 (63%) drank at least one sugar-sweetened beverage on a given day in 2011–2014.

    NHANES 2011–2014. Girls: 61.3%; boys: 64.5%.

    CDC National Center for Health Statistics, 2017Copy statLink

Extreme heat is the deadliest weather in the US, and it’s becoming more frequent.

1. 2,325

   2,325 people died of heat-related causes in the US in 2023, the most in any year since at least 1999 and more than double the 1999 count.

   Heat listed as an underlying or contributing cause on death certificates (CDC WONDER, 1999–2023); 2023 figures were provisional at publication. CDC later reported 2,391 heat-related deaths for 2024, under a definition it doesn’t state, so the two years aren’t directly comparable.

   JAMA, 2024Copy statLink

2. #1

   Heat is the deadliest weather hazard in the US, killing an average of 180 people a year over the past 30 years, according to the National Weather Service.

   30-year average, 1996–2025. NWS counts weather-event fatalities, which run well below death-certificate totals.

   National Weather Service (NOAA), 2025Copy statLink

3. 3×

   Large US cities now average six heat waves a year, up from two a year in the 1960s.

   Average across 50 large US metro areas, 2010s and 2020s.

   U.S. Environmental Protection Agency, 2024Copy statLink

4. 436

   436 US workers died from environmental heat exposure on the job between 2011 and 2021, according to the Bureau of Labor Statistics.

   BLS has since recorded 43 such deaths in 2022, 55 in 2023 and 48 in 2024.

   U.S. Bureau of Labor Statistics, 2023Copy statLink

5. 2%

   Dehydration that reaches 2% of body mass or more consistently reduces endurance performance, according to the National Athletic Trainers’ Association.

   Journal of Athletic Training (National Athletic Trainers’ Association), 2017Copy statLink

Basic physiology, and the health links public health bodies stand behind.

1. 60%

   Up to 60% of the adult human body is water.

   U.S. Geological Survey, 2019Copy statLink

2. #1

   Drinking enough liquid, mainly water, is the most important thing you can do to prevent kidney stones, according to the NIH’s kidney institute (NIDDK).

   National Institute of Diabetes and Digestive and Kidney Diseases, 2017Copy statLink

3. 7%

   About 7% of women and 11% of men in the US will have a kidney stone in their lifetime.

   Endotext (NCBI Bookshelf), 2026Copy statLink

4. Thirst

   The National Academies concluded that most healthy people meet their daily water needs by letting thirst guide them, along with drinks at meals.

   National Academies, 2004Copy statLink

5. Coffee counts

   The National Academies found that caffeinated drinks contribute to daily total water intake, like other beverages.

   National Academies, 2004Copy statLink

6. 400 mg

   The FDA cites 400 mg of caffeine a day, about two to three 12-fl-oz cups of coffee, as an amount not generally associated with negative effects for most adults.

   U.S. Food and Drug Administration, 2024Copy statLink

7. 24%

   Sugar-sweetened beverages are the single largest source of added sugars in the American diet, supplying 24% of added sugars for Americans ages 1 and older.

   NHANES 2013–2016. Sweetened coffee and tea are a separate category (11%).

   U.S. Department of Agriculture and U.S. Department of Health and Human Services, 2020Copy statLink

Two of the most-quoted hydration "facts" don’t hold up.

1. 75%

   The viral claim that "75% of Americans are chronically dehydrated" circulated in a 2011 chain email; Snopes rates its "chronically dehydrated" premise False.

   Snopes, 2001, updatedCopy statLink

2. 0

   A 2002 review in the American Journal of Physiology found no scientific studies supporting the advice to drink eight 8-oz glasses of water a day.

   The review’s conclusion covers healthy, largely sedentary adults in a temperate climate.

   American Journal of Physiology, 2002Copy statLink

Sources

1. National Academies of Sciences, Engineering, and Medicine (2005). Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate.
2. National Academies (2004). Report Sets Dietary Intake Levels for Water, Salt, and Potassium to Maintain Health and Reduce Chronic Disease Risk.
3. European Food Safety Authority (2010). Scientific Opinion on Dietary Reference Values for water.
4. Centers for Disease Control and Prevention (2024). Fast Facts: Data on Water Consumption (NHANES 2015–2018).
5. CDC National Center for Health Statistics (2016). Daily Water Intake Among U.S. Men and Women, 2009–2012 (NCHS Data Brief No. 242).
6. CDC National Center for Health Statistics (2020). Nonalcoholic Beverage Consumption Among Adults: United States, 2015–2018 (NCHS Data Brief No. 376).
7. CDC, Preventing Chronic Disease (2013). Behaviors and Attitudes Associated With Low Drinking Water Intake Among US Adults, Food Attitudes and Behaviors Survey, 2007.
8. CDC National Center for Health Statistics (2017). Sugar-sweetened Beverage Consumption Among U.S. Adults, 2011–2014 (NCHS Data Brief No. 270).
9. CDC National Center for Health Statistics (2017). Sugar-sweetened Beverage Consumption Among U.S. Youth, 2011–2014 (NCHS Data Brief No. 271).
10. JAMA (2024). Trends of Heat-Related Deaths in the US, 1999–2023 (Howard et al.).
11. National Weather Service (NOAA) (2025). Weather Related Fatality and Injury Statistics.
12. U.S. Environmental Protection Agency (2024). Climate Change Indicators: Heat Waves (archived; EPA has since removed the page).
13. U.S. Bureau of Labor Statistics (2023). 36 work-related deaths due to environmental heat exposure in 2021 (The Economics Daily).
14. Journal of Athletic Training (National Athletic Trainers’ Association) (2017). National Athletic Trainers’ Association Position Statement: Fluid Replacement for the Physically Active.
15. U.S. Geological Survey (2019). The Water in You: Water and the Human Body.
16. National Institute of Diabetes and Digestive and Kidney Diseases (2017). Eating, Diet, & Nutrition for Kidney Stones.
17. Endotext (NCBI Bookshelf) (2026). Nephrolithiasis (Maalouf NM).
18. U.S. Food and Drug Administration (2024). Spilling the Beans: How Much Caffeine Is Too Much?.
19. U.S. Department of Agriculture and U.S. Department of Health and Human Services (2020). Dietary Guidelines for Americans, 2020–2025.
20. Snopes (2001, updated). Do You Need Eight Glasses of Water Per Day? (fact check).
21. American Journal of Physiology (2002). "Drink at least eight glasses of water a day." Really? Is there scientific evidence for "8 x 8"?.