How Much Water Does One Person Use per Day?

The average American uses about 82 gallons (roughly 310 liters) of water per day at home, according to EPA WaterSense, which draws on U.S. Geological Survey estimates. Indoor use alone is lower: the largest North American end-use study measured about 58.6 gallons (222 liters) per person per day, and homes fitted with modern efficient fixtures come in under 40. The gap between those figures comes down to outdoor watering, leaks and the age of your toilet and washing machine — so here's where every gallon goes, and how to find your own number.

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Daily water use at a glance

Different sources measure different things, so it helps to see the main benchmarks side by side:

The 82-gallon figure is the one most people quote, and it covers everything a household uses at home — indoors and out. EPA WaterSense estimates that roughly 70% of home water use happens indoors and about 30% outdoors, mostly on landscape irrigation. The 58.6-gallon figure strips outdoor use away and counts only what flows through fixtures and appliances inside the house.

If you want one number to carry around: about 80 gallons a day per person in total, about 60 of it indoors. Your own home can land well above or below either.

Where each gallon goes

The Water Research Foundation's Residential End Uses of Water, Version 2 (REU2016) logged water flow every 10 seconds in hundreds of single-family homes and split it by fixture. Here's the average indoor use per person that came out of it:

Toilets lead because they're used constantly. The study found people flush about five times a day at an average of 2.6 gallons per flush — a figure dragged up by older toilets still in service. Showers held steady at an average of 7.8 minutes. Clothes washers saw the biggest drop since the 1999 edition of the study, falling from 15.0 to 9.6 gallons per person as front-loaders and high-efficiency top-loaders replaced older machines.

The dishwasher line surprises people: at 0.7 gallons per person, it's the smallest indoor use on the list. Modern machines recirculate a few gallons per cycle, so running a full load typically uses less water than washing the same dishes under a running tap.

Why the published numbers differ

Search this question and you'll see answers anywhere from 60 to 100 gallons. They aren't contradictory; they measure different things.

Indoor-only versus everything at home. End-use studies meter indoor fixtures separately, so their per-person numbers leave out lawn watering, pools and car washing. National estimates like the 82-gallon figure fold all of that in.

Who was measured. REU2016 studied single-family homes served by 23 utilities across the US and Canada. Its authors are explicit that the sample wasn't designed to represent every location, and apartments — which rarely have yards — weren't part of it.

What counts as "use." Neither figure includes the water that goes into growing your food or generating your electricity. That indirect water, your water footprint, is far larger than anything that comes out of a tap — but it's a different question from how much water you use at home.

Work out your own daily use

Averages are a starting point. Your own number depends on your fixtures and habits, and you can estimate it by adding up each use:

Worked example — two people, modern fixtures. Assume five flushes a day on a 1.6-gallon toilet, an 8-minute shower at 2.0 gpm, about 11 gallons of faucet use (the REU2016 average), four washer loads a week at 20 gallons, and four dishwasher loads at 4 gallons:

Swap in older equipment — a 3.5-gallon toilet, a 2.5 gpm showerhead, a 40-gallon top-loader and a 10-gallon dishwasher — and the same habits come to roughly 63 gallons per person. Same people, same routine, about 50% more water. That's why fixture age matters more than almost anything else you do.

Or read it off your bill. Your meter already knows the answer. Divide the water on your bill by the days in the billing period and the number of people at home:

A winter bill, when nobody is watering a lawn, gives a good read on indoor use; a summer bill shows the all-in figure. The water usage per person calculator runs either method for you, and the household water usage calculator does the same for the whole home.

What pushes the number up or down

Fixture and appliance age. Federal limits since the 1990s cap new toilets at 1.6 gallons per flush and showerheads at 2.5 gpm, and WaterSense-labeled models go lower. A house with original 1980s fixtures can use half again as much water for identical habits, as the worked example shows.

Climate and outdoor watering. This is the biggest swing factor. EPA WaterSense puts outdoor use at more than 30% of household water on average, but as much as 60% in arid regions. In REU2016's landscape sample, outdoor use made up half of annual household water.

Leaks. EPA estimates the average family loses about 9,400 gallons a year to household leaks — running toilets, dripping faucets, worn valves. Most run silently: a toilet flapper that doesn't seal can waste water for weeks before anyone notices. The water leak cost calculator puts a dollar figure on it.

Who lives there. REU2016 found that homes with children aged 12 and under use more bath water. Anyone who works from home also shifts toilet and faucet use from the office to the household meter.

Habits. Shower length, running the tap while brushing, and half-empty laundry loads all add up. EPA estimates that turning off the tap while brushing your teeth alone saves about 8 gallons a day.

Real-world benchmarks

Where does your number sit? These four reference points cover most homes:

How to lower your daily use

EPA WaterSense estimates that most people could use at least 20% less water simply by installing water-efficient fixtures and appliances. The order that usually gives the most back:

Start with the toilet. It's the largest indoor use, and replacing a pre-1994 model is often the single biggest cut available. The toilet flush savings calculator shows what a swap would save.

Fix leaks next. They cost nothing to use and often little to fix. A dye tablet in the toilet tank and a meter check with every tap off will catch most of them.

Change the showerhead. A WaterSense-labeled head is cheap and saves water every day. Compare the options with the low-flow fixture savings calculator.

Tackle the yard. If you irrigate, a smarter controller, watering early in the day and drought-tolerant planting will usually save more than every indoor change combined.

The bottom line

One person in the US uses about 82 gallons of water a day at home on average, with roughly 59 gallons of that going through indoor fixtures and appliances. Toilets, showers and faucets do most of the work, leaks quietly add more than most people expect, and outdoor watering is the biggest variable of all. A home with modern fixtures can run below 40 gallons per person indoors; an older one with a leak can run well past 100. To see where you land, add up your fixtures or divide your bill — or let the calculator below do it.