Keeping a supply of drinking water at home is one of the simplest household planning steps you can take. Water service can occasionally be interrupted by plumbing repairs, utility problems, severe weather, or other unexpected events, and stores may not always be easily reached.
So how much water should you store?
A useful starting point is one gallon per person per day. U.S. preparedness guidance commonly uses this amount for drinking and basic sanitation. A 3-day supply is a practical minimum to establish first, while households with adequate space may choose to build toward 7 days or approximately 2 weeks.
The right amount for your household can be higher depending on climate, pets, pregnancy, medical needs, children, older adults, and how much water you expect to use for cooking and hygiene.
In This Guide
- How Much Water Should You Store?
- Household Water Calculator
- Family of Four Example
- When You May Need More
- Water for Pets
- Choosing Containers
- Preparing Containers
- Where to Store Water
- How Often to Rotate Water
- Bottled vs. Home-Filled Water
- Small-Space Storage
- How Heavy Is Stored Water?
- Build Your Water Plan
- Stored Water & Filtration
- Frequently Asked Questions
How Much Water Should a Household Store?
A commonly used U.S. planning guideline is:
The one-gallon figure is intended to provide water for drinking and basic sanitation. It is a planning baseline rather than a precise measure of every person's daily drinking requirement.
Your actual needs may be higher.
A Practical Storage Progression
- First goal: 3 days
- Next goal: 7 days
- Longer household supply: up to about 2 weeks where practical
You do not need to build a two-week supply immediately. If storage space or budget is limited, establishing three days first is more useful than postponing water storage because an ideal amount feels unrealistic.
Household Water Storage Calculator
| Household Size | 3 Days | 7 Days | 14 Days |
|---|---|---|---|
| 1 person | 3 gallons | 7 gallons | 14 gallons |
| 2 people | 6 gallons | 14 gallons | 28 gallons |
| 3 people | 9 gallons | 21 gallons | 42 gallons |
| 4 people | 12 gallons | 28 gallons | 56 gallons |
| 5 people | 15 gallons | 35 gallons | 70 gallons |
| 6 people | 18 gallons | 42 gallons | 84 gallons |
These figures are starting amounts. Add water for pets and any household circumstances that increase your needs.
How Much Water Should a Family of Four Store?
Using the one-gallon-per-person-per-day guideline:
- 3 days: 12 gallons
- 7 days: 28 gallons
- 14 days: 56 gallons
Fifty-six gallons may sound like a large amount—and physically, it is.
You do not need to store it in one container. A combination of smaller containers can be easier to carry, rotate, distribute, and fit into different parts of a home.
When Should You Store More Than One Gallon Per Person Per Day?
One gallon per person per day is a useful baseline, but some households should plan for additional water.
Hot Weather
Higher temperatures and physical activity can increase fluid needs.
Pregnancy and Breastfeeding
Pregnant or breastfeeding household members may have higher hydration needs.
Medical Needs
Some health conditions, medications, or home medical equipment may increase water needs or require reliable access to water.
Children and Older Adults
These household members may need additional planning, particularly when they depend on others for access to drinking water.
Cooking
Meals that require water can substantially increase household use.
Examples include:
- Rice
- Pasta
- Oatmeal
- Soup
- Coffee
- Tea
- Powdered beverages
Basic Hygiene
If your one-gallon-per-person allocation needs to cover more than drinking and basic food preparation, additional water can provide more flexibility.
For infant formula, follow current preparation instructions carefully. Water quality and preparation requirements can become especially important when normal water service has been disrupted.
How Much Water Should You Store for Pets?
Pets should be included separately in your household calculation.
Water needs vary substantially based on:
- Animal type
- Body size
- Diet
- Activity
- Temperature
- Health conditions
Do not simply assume the human one-gallon rule applies equally to every animal.
A practical approach is to observe how much fresh water your pets normally consume and store enough to cover that routine with an additional margin.
What Containers Should You Use for Water Storage?
You can use commercially bottled water or appropriate food-grade storage containers.
A good reusable water container should:
- Be made for food or drinking-water storage
- Be durable
- Close securely
- Be easy to fill and empty
- Be manageable when full
- Protect stored water from contamination
Never Repurpose Chemical Containers
Do not store drinking water in containers that previously held:
- Fuel
- Pesticides
- Household cleaners
- Bleach
- Industrial chemicals
- Other toxic substances
Washing a chemical container does not make it appropriate for drinking-water storage. Residues can remain in the material or container.
How to Prepare Reusable Water Storage Containers
Use containers designed for safe food or drinking water storage, and follow the manufacturer's cleaning instructions.
Before filling a reusable container:
- Wash the container thoroughly with soap and water.
- Rinse it completely.
- Sanitize it according to current public-health guidance.
- Allow it to drain as directed.
- Fill it with suitable drinking water.
- Close it tightly.
- Label it clearly as drinking water.
- Write the storage date on the container.
A narrow opening or dispensing spigot can help reduce the need to place cups, hands, or other objects inside the container.
Where Should Stored Water Be Kept?
CDC recommends keeping stored water in a cool place, away from direct sunlight and toxic substances.
Possible locations include:
- Interior closets
- Pantries
- Climate-stable basement areas
- Utility storage areas
- Under suitable furniture
- Other cool indoor storage areas
Be Careful With Garages
A garage can seem convenient, but temperatures can become very high or very low depending on the climate.
Garages may also contain:
- Gasoline
- Paint
- Pesticides
- Solvents
- Automotive chemicals
If possible, drinking-water storage is better kept away from those substances and extreme temperature swings.
How Often Should Stored Water Be Replaced?
Water You Fill Yourself
CDC recommends replacing home-filled stored water every six months.
Label each container with its storage date so the rotation schedule is easy to follow.
Commercially Bottled Water
For unopened commercially bottled water, follow the manufacturer's storage information and date markings.
An easy system: check your home-filled water twice a year. Choose two dates you already remember—such as the beginning of spring and fall—and use them as your water-storage review dates.
Commercially Bottled Water vs. Home-Filled Containers
| Feature | Commercial Bottled Water | Home-Filled Containers |
|---|---|---|
| Initial convenience | Ready to store | Requires cleaning, sanitizing and filling |
| Container size | Usually smaller bottles or jugs | Wide range of container capacities |
| Rotation | Follow manufacturer guidance | Replace stored water about every six months |
| Cost | Higher recurring purchase cost | Reusable containers can reduce repeat packaging costs |
| Portability | Small bottles are easy to distribute | Depends on container size |
Many households may find a combination useful: smaller commercially sealed bottles plus larger reusable storage containers.
How to Store Water in a Small Apartment
You do not need a garage or basement to keep a useful water supply.
Possible small-space approaches include:
- Use several smaller containers instead of one large tank.
- Use the bottom of a closet.
- Store suitable containers under a bed.
- Use unused pantry floor space.
- Distribute containers among several storage areas.
- Build the supply gradually.
Be mindful of weight. Water is heavy, so shelves and elevated storage locations must be able to support the load.
How Much Does Stored Water Weigh?
One U.S. gallon of water weighs roughly 8.3 pounds, before adding the weight of the container.
| Water Volume | Approximate Water Weight |
|---|---|
| 1 gallon | 8.3 lb |
| 5 gallons | About 42 lb |
| 10 gallons | About 83 lb |
| 28 gallons | About 233 lb |
| 56 gallons | About 466 lb |
This matters when deciding:
- Container size
- Shelf strength
- Floor placement
- Whether household members can move the container
Five-Gallon Containers
A five-gallon container holds about 42 pounds of water, plus the weight of the container itself.
That can be manageable for some adults but difficult for children, older adults, or anyone with mobility limitations.
Should You Store Water in One Large Tank?
Large storage tanks can make sense when a household has enough space and an appropriate installation.
But several smaller containers have advantages:
- Easier to lift
- Easier to rotate
- Easier to inspect
- Easier to distribute throughout the home
- Loss of one container does not affect the entire supply
The best setup may combine different sizes.
What About Bathtub Water Storage?
A bathtub should not normally be considered your primary stored drinking-water supply.
Even a clean-looking bathtub can contain residues and be difficult to protect from contamination.
If a temporary bathtub storage liner is specifically designed for water storage, follow the manufacturer's instructions and carefully consider the intended use of the stored water.
Permanent drinking-water storage is better handled with containers intended for that purpose.
Should You Freeze Some of Your Water?
Freezing suitable water containers can provide two benefits:
- Additional stored water once thawed
- Cold mass that may help a freezer stay cold longer during a power interruption
Leave enough expansion space in containers intended for freezing, and use containers designed to tolerate freezing.
Don't Forget the Water Already in Your Home
Depending on circumstances, homes may contain additional water in:
- A conventional tank-style water heater
- Plumbing lines
- Ice
Whether these are appropriate sources depends on the nature of the water interruption or contamination event.
If officials say the public water supply is contaminated with chemicals, do not assume water elsewhere in your plumbing system is suitable for drinking. Follow the instructions issued for that specific event.
How to Build a Household Water Storage Plan
Step 1: Count Household Members
Include everyone who normally lives in the home.
Step 2: Choose a Starting Duration
Three days is a practical first milestone. Increase to seven days, or about two weeks, as space permits.
Step 3: Calculate the Baseline
Multiply one gallon by the number of people and the number of days.
Step 4: Add Household-Specific Needs
Consider pets, climate, cooking, pregnancy, medical requirements, children, and older adults.
Step 5: Choose Appropriate Containers
Use commercially sealed water or containers designed for drinking-water storage.
Step 6: Choose Storage Locations
Look for cool, dark locations away from chemicals and excessive temperature changes.
Step 7: Label Everything
Mark reusable containers with the fill date and identify them as drinking water.
Step 8: Establish a Rotation Schedule
Replace home-filled water approximately every six months.
Where Does Home Water Filtration Fit?
Stored water and home filtration solve different household needs.
Stored water provides an available reserve when your normal supply is interrupted or inconvenient to access.
Water filtration addresses particular characteristics of the source water when the filtration system is appropriate for those substances.
A countertop water filter is therefore not a substitute for maintaining a stored water supply.
If you use a Berkey® system for everyday household filtration, see our Berkey® Water Filter Systems Guide and Water Filter Test Results. During a water advisory or other supply problem, always follow instructions from the responsible water utility or public-health authority.
Frequently Asked Questions About Household Water Storage
How much water should I store per person?
A common U.S. planning guideline is at least one gallon per person per day for drinking and basic sanitation.
How many days of water should I keep?
Three days is a useful minimum starting point. Households with sufficient space may gradually increase their supply toward seven days or approximately two weeks.
How much water should a family of four store?
Using the one-gallon-per-person guideline, four people need 12 gallons for three days, 28 gallons for seven days, and 56 gallons for fourteen days.
Is one gallon per person per day only for drinking?
No. The preparedness guideline is intended to account for drinking and basic sanitation. Households that expect significant cooking, hygiene, or other water-use needs should store more water.
How often should home-filled stored water be replaced?
CDC recommends replacing water you store yourself approximately every six months.
Do I need to replace commercially bottled water every six months?
Follow the manufacturer's date and storage guidance for commercially bottled water rather than automatically applying the six-month rule used for home-filled water.
Can I store tap water?
Yes, suitable tap water can be stored in properly cleaned and sanitized food-grade drinking-water containers. Follow current public health guidance for preparation, filling, and rotation.
Can I store water in milk jugs?
Containers specifically intended for long-term drinking-water storage are generally preferable. Thin disposable containers can be difficult to sanitize thoroughly, may leak over time, and may not be designed for repeated long-term use.
Can I reuse juice or soda bottles for water?
Purpose-made food-grade water containers are preferable for planned long-term storage. Never reuse a container that held toxic or non-food substances.
Can I store drinking water in the garage?
A garage may have extreme temperatures and chemicals such as gasoline or pesticides. A cool indoor location away from toxic substances is preferable when available.
Does stored water expire?
Properly stored water does not “spoil” in the same way as food, but storage conditions, container integrity, and the risk of contamination still matter. Rotate home-filled water on the recommended schedule and follow manufacturer guidance for bottled products.
How much does five gallons of water weigh?
Five U.S. gallons of water weigh approximately 42 pounds, not including the storage container.
Should I store water for my pets?
Yes. Include your animals in the household plan. Their needs vary by species, size, diet, health, and climate.
Should I store extra water in hot climates?
Yes. Hot weather and increased physical activity can increase drinking-water requirements, so a larger reserve may be appropriate.
Can I rely on my water filter instead of storing water?
No. A home filter requires a water source to treat. Stored water serves a different purpose when the normal source is unavailable or when authorities advise against using it.
Can I store filtered water?
You can store suitable filtered water in properly prepared containers, but filtration does not eliminate the need for safe handling, clean containers, and appropriate rotation.
Final Thoughts
A household water supply does not need to be complicated.
Start with the standard planning calculation:
Build three days first. Add pets and any special household needs. Then, if you have the room, gradually increase the supply toward seven days or approximately two weeks.
Just as important as quantity is storage quality: use appropriate containers, label them, keep them cool and away from chemicals, and rotate home-filled water on schedule.
The best water-storage plan is one your household can actually maintain. A smaller, properly stored and regularly rotated supply is more useful than an ambitious plan that never gets implemented.