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A two-person household in the United States may use about 164 gallons of water per day on average, based on the EPA estimate of about 82 gallons per person per day at home. Actual use can be much lower in an efficient home, or much higher when lawn watering and other outdoor uses are included.
For planning purposes, about 80 to 120 gallons per day for two people can be a reasonable goal for a water-conscious household with efficient fixtures and moderate habits, especially when looking mainly at indoor use. This is not an official limit. Your climate, plumbing fixtures, laundry habits, leaks, and outdoor watering can change the total a great deal.
How Much Water Do Two People Typically Use?
EPA WaterSense says the average American uses about 82 gallons of water per day at home. For two people, that works out to roughly:
- 164 gallons per day
- About 1,150 gallons per week
- About 4,900 gallons in a 30-day month
These figures include household water use and can vary widely from one home to another. Outdoor irrigation is one major reason. EPA says outdoor use accounts for about 30% of household water use nationwide, but the share can be much higher in dry regions.
Older USGS guidance gives a broader estimate of about 80 to 100 gallons per person per day for home use. That would put a two-person household around 160 to 200 gallons per day.
The important point is that these numbers describe typical use. They are not a requirement for how much water you should use.
A Practical Daily Target for Two People
A two-person home using 80 to 120 gallons per day indoors is generally operating well below the current national household average.
That means roughly 40 to 60 gallons per person per day.
Getting toward the lower end is more realistic when the home has:
- Efficient toilets and showerheads
- Shorter showers
- Full loads in the washing machine
- Efficient appliances
- No plumbing leaks
- Careful faucet use
Very efficient homes can use even less. EPA documentation for its WaterSense homes program cites an average indoor use of about 36.7 gallons per person per day for homes using efficient plumbing fixtures, appliances, and design practices.
For two people, that shows that indoor use well below 100 gallons per day is possible. It should not be treated as a guarantee or a required target for every household.
Where Does the Water Go?
Daily water use is spread across several activities.
Toilets
Toilets can be one of the largest indoor water uses. EPA notes that toilet flushing accounts for roughly 25% to 30% of household water use in some homes. Older toilets may use much more water per flush than newer efficient models.
If two people are home most of the day, toilet use can add up quickly.
Showers
Shower use depends on two things:
Flow rate × shower time
Flow rate means how many gallons come from the showerhead each minute.
For example, changing the length of a daily shower can make a noticeable difference even without changing any plumbing.
Faucets
Bathroom and kitchen faucets are used many times each day for:
- Handwashing
- Brushing teeth
- Cooking
- Cleaning
- Washing dishes
The amount depends on the faucet's flow rate and how long it runs.
Clothes Washing
Laundry use varies more than many people expect.
Two people who wash several small loads each week may use considerably more water than a household that waits for full loads.
The age and design of the washing machine also matter.
Leaks
Leaks can make household water use look unusually high.
EPA estimates that an average family can waste about 180 gallons per week through household leaks. Some homes lose much more when toilets, irrigation systems, or underground pipes leak continuously.
If your two-person household suddenly starts using much more water without a change in routine, checking for leaks is a good first step.
Outdoor Watering
Outdoor use can completely change the numbers.
A household that uses 90 gallons per day indoors might use far more during a hot week if it also waters:
- Lawns
- Vegetable gardens
- Trees
- Flower beds
- Containers
This is why comparing one household with another can be misleading.
Climate and landscape size matter as much as the number of people.
How to Find Your Real Daily Water Use
Your water bill is usually the easiest place to start.
Find the total amount of water used during the billing period and divide it by the number of days.
For example, if your bill covers 30 days:
Daily household use = total gallons ÷ 30
Then divide again by two if you want your approximate use per person.
Some utilities measure water in units called CCF rather than gallons. One CCF equals 748 gallons.
Evaluate water-tank capacity for two people to compare reserve capacity for likely demand and collection rates.
Compare several bills rather than just one. Seasonal changes can be large, especially if you irrigate outdoors.
What If Two People Are Using More Than 200 Gallons Per Day?
More than 200 gallons per day does not automatically mean something is wrong.
Start by looking at how the water is being used.
Possible reasons include:
- Lawn irrigation
- Long or frequent showers
- An older washing machine
- Older high-volume toilets
- Frequent laundry
- A swimming pool
- Guests
- A leaking toilet or faucet
- An irrigation leak
A sudden increase is usually more important than the number alone.
For example, if your home normally uses 120 gallons per day and jumps to 220 gallons without any change in routine, check for leaks.
EPA specifically recommends watching your water-use trend because unexplained increases can indicate leaking fixtures or other problems.
How Much Water Should You Plan for With a Cistern or Rainwater System?
If you are sizing stored rainwater, do not automatically multiply the national household average by the number of storage days.
First decide what the rainwater will supply.
For example, you might collect rainwater only for:
- Garden irrigation
- Landscape watering
- Toilet flushing where allowed
- Laundry where allowed
- Outdoor cleaning
Those uses require much less stored water than supplying every household fixture.
Suppose your two-person home uses 100 gallons per day from the municipal supply. That does not mean you need 100 gallons of rainwater storage for every day you want coverage. If rainwater supplies only the garden, your storage requirement should be based on garden demand instead.
Also remember that tank capacity and usable water are not always the same. Some water may remain below the outlet, and real systems need room for operating limits, sediment management, and overflow.
What About Using Rainwater for the Whole House?
Whole-house rainwater use requires more planning than garden watering.
Roof runoff should not be assumed to be clean or safe to drink. It can contain material from the roof, gutters, animals, insects, dust, smoke, and other environmental sources.
If rainwater will be used only for suitable non-potable purposes, treatment needs may be simpler.
Non-potable means water that is not intended for drinking.
If rainwater is intended for drinking, cooking, or other potable uses, storage volume is only one part of the system. Collection materials, debris control, first-flush management, filtration, treatment, current laboratory testing, ongoing maintenance, and local requirements all need to be considered together.
Do not rely on one filter, UV unit, test strip, or water-quality meter to establish that roof runoff is safe to drink.
Simple Ways for Two People to Use Less Water
You do not need to make every fixture inconvenient to reduce water use.
Start with the largest or easiest sources.
Check toilets for silent leaks. Repair dripping faucets. Run full laundry loads when practical. Avoid leaving faucets running unnecessarily. Review shower length and showerhead flow.
Outdoor use deserves special attention. EPA notes that inefficient irrigation can lose substantial amounts of water through runoff, evaporation, and poor application.
If you collect rainwater, using it for garden irrigation can also reduce treated municipal or well-water demand without requiring a potable rainwater system.
The Bottom Line
For a two-person household, about 164 gallons per day is a useful current U.S. average, based on EPA's estimate of 82 gallons per person per day.
A water-conscious two-person household may be closer to 80 to 120 gallons per day indoors, while a highly efficient home may use still less. Heavy landscape irrigation can push total household use well above these numbers.
The best benchmark is your own water bill. Track several months, separate indoor use from outdoor watering when possible, and investigate unexplained increases.
If you are using the number to size a rainwater tank, calculate the demand for the specific uses the tank will supply rather than assuming it must cover all household water use.
Frequently Asked Questions
Is 100 gallons per day good for a two-person household?
Yes. About 100 gallons per day for two people equals roughly 50 gallons per person per day. That is below the EPA's current national household average of about 82 gallons per person per day and can be a reasonable level for an efficient household.
Is 200 gallons per day too much for two people?
Not necessarily. It is above the current U.S. average for two people, but outdoor watering, older fixtures, frequent laundry, guests, or other uses may explain it. If your consumption suddenly rises to this level without a change in routine, check for leaks.
How many gallons does one person use per day?
EPA WaterSense currently estimates that the average American uses about 82 gallons of water per day at home. Actual household use varies with climate, fixtures, appliances, habits, leaks, and outdoor irrigation.
How much water does a two-person household use per month?
At the EPA average of about 82 gallons per person per day, two people would use roughly 4,900 gallons during a 30-day month. An efficient household may use substantially less, while a home with significant irrigation may use much more.
Can two people live on 50 gallons of water per day?
It is possible to use only 50 gallons per day total, but that is a low household allowance of 25 gallons per person. Reaching it usually requires very efficient fixtures and careful water use. It may not include normal lawn or garden irrigation.
Should I size a rainwater tank for 164 gallons per day?
Only if the rainwater system truly needs to supply that much demand. For garden irrigation, toilet flushing, or another limited use, calculate that use separately. Whole-house rainwater supply requires much more planning, especially if the water could be used for drinking or cooking.
Why has my household water use suddenly increased?
Common causes include irrigation, guests, more laundry, a running toilet, leaking fixtures, or an irrigation-system leak. Compare recent bills with earlier periods and investigate increases that cannot be explained by changes in normal use.
