Average Water Use per Person
The average American uses about 82 gallons of water per person, per day at home (U.S. EPA). For a typical four-person household that is roughly 328 gallons a day, about 9,900 gallons a month. Around 70% of home water use is indoors.
The average home water use is about 82 gallons per person per day. A four-person household therefore uses roughly 328 gallons/day, ~9,970 gallons/month and ~119,700 gallons/year.
- Per person, per day82 gal
- Household of 4, per day~328 gal
- Household of 4, per month~9,970 gal
- Share used indoors~70%
- Family total, per day300+ gal
What counts as “water use per person”
This is average residential water use — total household water withdrawn for indoor and outdoor use, divided by the number of people. It is an average, not a median, so heavy outdoor users pull it upward. The EPA notes the average U.S. family uses more than 300 gallons per day at home, and about 70% of that is used indoors (toilets, showers, faucets, clothes washers and leaks are the largest indoor shares).
Water use by household size
| Household size | Per day | Per month | Per year |
|---|---|---|---|
| 1 person | 82 gal | ~2,500 gal | ~29,900 gal |
| 2 people | 164 gal | ~5,000 gal | ~59,900 gal |
| 3 people | 246 gal | ~7,500 gal | ~89,800 gal |
| 4 people | 328 gal | ~9,970 gal | ~119,700 gal |
| 5 people | 410 gal | ~12,500 gal | ~149,700 gal |
Estimated as 82 gallons/person/day × household size. Actual use varies with climate, lawn size, fixtures and habits.
Where the water goes
Indoors, the biggest uses are toilets (~24%), showers (~20%), faucets (~19%) and clothes washers (~17%), with leaks accounting for roughly 12% of the average home’s water. Switching to WaterSense-labeled fixtures can cut indoor use by 20% or more. Outdoor watering is the largest swing factor between households and seasons.
Frequently asked questions
How many gallons of water does one person use per day?
About 82 gallons per day on average at home in the U.S., according to the EPA. Careful households with efficient fixtures often use far less.
How much water does a family of four use?
Roughly 328 gallons per day (about 9,970 gallons per month), based on 82 gallons per person per day. The EPA cites 300+ gallons per day for an average family.
What uses the most water in a home?
Indoors, toilets, showers and faucets are the largest uses; leaks waste about 12%. Outdoor irrigation is the biggest single variable between homes.
Is 82 gallons a day a median or an average?
It is an average. Because a minority of high outdoor users pull the mean up, a typical (median) household often uses somewhat less.
Sources & methodology
Sources: U.S. Environmental Protection Agency — WaterSense.
Figures are the EPA WaterSense average residential water use per person per day. Per-household values are NumberBench calculations (82 gallons × household size, with 30.44 days/month and 365 days/year).
Last checked July 2026 · Reviewed against the EPA WaterSense statistics page; updated when the EPA revises its figures.