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There is no single rain barrel that can fairly be called the highest rated for every home. Ratings change by store and over time, and a barrel that works well on one house may be a poor fit on another.
A better choice is a rain barrel that has the right capacity, a secure screened inlet, a dependable overflow path, useful outlet placement, and fittings that match how you plan to use the water.
For most homeowners, those features matter more than a high star rating.
What Makes a Good Rain Barrel?
A good rain barrel does four basic jobs:
- Accepts water from the downspout.
- Keeps leaves, insects, and larger debris out.
- Stores the water without leaking.
- Sends excess water somewhere safe when the barrel fills.
It should also let you remove stored water without making everyday use difficult.
A Secure Screened Inlet
The opening where rainwater enters should be screened or otherwise protected.
A screen helps stop:
- Leaves
- Twigs
- Roof debris
- Mosquitoes and other insects
- Small animals
The screen still needs cleaning. A clogged screen can cause water to back up or spill around the barrel.
A screen is only a first layer of protection. It does not make roof runoff safe to drink.
A Proper Overflow Connection
Every rain barrel eventually fills during a large enough storm.
Once that happens, the excess water needs somewhere to go. A good barrel has an overflow fitting large enough to handle incoming water without constantly spilling over the top.
Ideally, the overflow can be directed:
- Back into the existing drainage system
- Through a hose or pipe to a safe drainage area
- Into another rain barrel
- Away from the house foundation
Do not assume a small garden hose connection can handle the full flow from a roof during heavy rain.
A Useful Outlet Position
Most rain barrels use a spigot or threaded outlet near the bottom.
Look at its height before choosing a barrel. An outlet too close to the ground can make attaching a watering can or hose awkward.
A higher outlet is easier to reach, but it can leave more unusable water at the bottom of the barrel.
Some systems have a separate lower drain that makes seasonal cleaning easier.
What Size Rain Barrel Is Best?
For many homes, a single rain barrel is relatively small compared with the amount of water a roof can collect.
One inch of rain falling on 1,000 square feet of roof represents roughly 623 gallons of water before losses. Actual collection will be lower because some water is lost to wetting the roof, splash, leaks, debris removal, and other parts of the system.
That means even a moderate storm can fill a typical residential rain barrel quickly.
Capacity should therefore be chosen according to what you want the water to do.
A smaller barrel may be enough for a few containers or a small garden bed. A larger tank, several connected barrels, an IBC tote, or a cistern may make more sense if you want meaningful irrigation storage.
Before increasing storage capacity, remember that water is heavy. Water weighs about 8.34 pounds per U.S. gallon. A 50-gallon barrel holds more than 400 pounds of water, not including the barrel itself.
Place any rain barrel on a firm, stable, level base that can support its full weight.
The Best Rain Barrel Depends on How You Will Use the Water
The intended use should guide the choice.
For Filling Watering Cans
Look for:
- A spigot with enough clearance underneath
- A stable base
- Easy access to the lid or screen for cleaning
- A capacity you can reasonably use between storms
A decorative barrel can work well if its fittings and overflow arrangement are practical.
For Using a Garden Hose
Gravity-fed barrels produce limited pressure.
The pressure comes from the height difference between the water surface and the outlet. This height difference is often called head height.
Raising the barrel increases available pressure somewhat, but a rain barrel should never be placed on an unstable platform just to gain more pressure.
Long hoses, narrow fittings, filters, and elevation changes can further reduce flow.
If an irrigation system needs substantial pressure, a properly selected pump may be necessary.
For Drip Irrigation
Check the pressure requirements of the drip equipment before assuming it will work from a barrel.
Some low-pressure irrigation parts can operate with gravity-fed water. Others need more pressure than a typical rain barrel can provide.
Filters may also be needed because small irrigation emitters clog easily.
For Larger Gardens
Capacity becomes more important.
Connecting several barrels can increase storage, but the connection method matters. The barrels need suitable fittings, level placement, adequate overflow capacity, and a way to isolate or drain parts of the system when needed.
At some point, one larger storage tank can be simpler than maintaining many small barrels.
Look Closely at the Connections
A highly praised barrel can still be frustrating if its fittings do not match your system.
Check the inlet, outlet, overflow, and drain connections before choosing one.
Threaded Outlets
Determine what type and size of thread the barrel uses.
A garden hose connection is convenient for simple watering. Larger threaded ports can provide more options for plumbing valves, pumps, and irrigation lines.
Do not force together fittings with incompatible thread types. A fitting can appear to screw together while still leaking or damaging the threads.
Bulkhead Fittings
A bulkhead fitting creates a sealed connection through the wall of a tank or barrel.
They are commonly used for:
- Outlets
- Drains
- Overflow pipes
- Connections between tanks
If you plan to modify a barrel, check whether its wall shape provides a suitable flat area for the fitting.
Downspout Connections
Some barrels collect water through an opening at the top. Others use a downspout diverter.
A diverter sends part of the downspout flow into the barrel. Depending on the design, excess water may continue through the normal downspout after the barrel fills.
Explore attaching a garden hose to a rain barrel to assess storage-surface compatibility with the planned application.
Check that the diverter matches the size and shape of your downspout.
An Opaque Barrel Is Usually Easier to Manage
Sunlight encourages algae growth.
For that reason, a rain barrel that blocks light is generally easier to maintain than a clear or translucent container exposed to sunlight.
Dark storage alone does not prevent every water-quality problem. Organic material can still enter the system and settle at the bottom.
Keep the barrel covered and clean it as needed.
Think About Cleaning Before Buying
A barrel that is difficult to clean can become unpleasant to maintain.
Roof runoff may carry:
- Dust
- Pollen
- Leaves
- Insect material
- Bird and animal waste
- Roofing debris
- Other contaminants
Some of this material settles inside the barrel.
A removable lid or accessible inspection opening can make cleaning easier. A low drain can also help remove sediment.
Do not enter large tanks or cisterns for cleaning. Confined spaces can be dangerous and may require specialized procedures and equipment.
Is a First-Flush Diverter Necessary?
A first-flush diverter redirects some of the first runoff from a storm before water enters storage.
The beginning of a rainfall can wash accumulated debris from the roof and gutters. Diverting some of that runoff can reduce the amount entering the barrel.
Whether a first-flush device is useful depends on the roof, surrounding trees, intended use, local conditions, and the rest of the collection system.
It is an extra pretreatment step, not a way to make collected rainwater safe to drink.
What About Decorative Rain Barrels?
Appearance is reasonable to consider because a barrel may sit beside the house for years.
But do not choose one on appearance alone.
Decorative barrels sometimes have narrow openings, unusual shapes, small overflow fittings, or outlets that are difficult to repair. Check the functional parts before deciding.
A simpler barrel with accessible standard fittings may be easier to maintain over the long term.
Features Worth Prioritizing
When comparing rain barrels, focus on practical system fit rather than trying to find the highest-rated model.
Useful features include:
| Feature | Why It Matters |
|---|---|
| Opaque container | Limits light reaching stored water |
| Screened inlet | Helps exclude debris and insects |
| Secure cover | Reduces contamination and access by animals |
| Large overflow connection | Helps control excess stormwater |
| Accessible spigot | Makes routine watering easier |
| Lower drain | Helps with cleaning and winter draining |
| Replaceable fittings | Makes repairs easier |
| Stable base design | Helps support the heavy full barrel |
| Downspout compatibility | Avoids difficult adapters or poor connections |
| Cleaning access | Makes sediment removal easier |
Not every barrel needs every feature. Choose according to how the system will actually be used.
Be Careful With Raised Rain Barrels
Raising a barrel can create clearance for a watering can and increase gravity pressure.
But the support must handle the full weight of the barrel.
For example, even a modest barrel may weigh several hundred pounds when full. Improvised supports such as loose blocks, unstable furniture, or uneven stacks can shift or collapse.
Use a stable, level support suitable for the expected load.
What About Freezing Weather?
A barrel that remains full through freezing temperatures may be damaged as water expands.
The correct winter setup depends on the barrel, plumbing layout, and climate. In freezing areas, systems are commonly designed so exposed barrels, hoses, valves, pumps, and pipes can be drained or protected.
Do not assume that a barrel labeled for outdoor use can safely remain full through repeated freezing.
Also make sure winter downspout drainage still sends water away from the foundation after the barrel is disconnected or bypassed.
Can Rain Barrel Water Be Used for Drinking?
Do not assume water collected from a roof is potable.
Potable means suitable for drinking. Rain barrel water is normally treated as non-potable, meaning it is intended for uses that do not require drinking-water quality.
Roof runoff can pick up contaminants from roofing materials, animals, airborne pollution, gutters, and storage equipment.
A screen, sediment filter, first-flush diverter, carbon filter, UV unit, or home test kit by itself does not establish that the water is safe to drink.
Using collected rainwater as drinking water requires a whole-system approach. That can include appropriate collection surfaces, pretreatment, treatment suited to the hazards involved, careful maintenance, current laboratory testing, and compliance with applicable local requirements.
For a household drinking-water system, get guidance from qualified water-treatment and local health professionals.
So, Which Rain Barrel Should You Choose?
Instead of looking for the barrel with the highest rating, choose the one that fits these five parts of your system:
- Collection: Does it connect properly to your downspout?
- Storage: Does it hold enough water for your intended use?
- Overflow: Can excess rainwater leave safely?
- Delivery: Will the outlet provide the flow and access you need?
- Maintenance: Can you screen, drain, inspect, and clean it easily?
For basic garden watering, a durable opaque barrel with a screened inlet, accessible outlet, proper overflow connection, secure lid, and serviceable fittings is usually a better choice than one selected mainly because of its online rating.
If one barrel is too small for the amount of water you want to use, moving to larger storage may make more sense than trying to find a supposedly better barrel.
Frequently Asked Questions
What size rain barrel is best for a house?
There is no single best size. Match storage to your roof collection area, local rainfall pattern, available space, and how much water you can use between storms. Even a relatively small section of roof can fill a typical barrel quickly.
Is a 50-gallon rain barrel big enough?
It can be useful for watering containers, small beds, or other limited garden needs. It is small compared with the amount of runoff many roofs can produce, so it may overflow frequently during wet weather.
Can I connect two rain barrels together?
Yes, if the barrels have suitable connection points and are installed correctly. Pay attention to fitting size, barrel height, support, overflow routing, and how the barrels will be drained and cleaned.
Do rain barrels need a pump?
Not always. Gravity can provide enough flow for filling watering cans and some low-pressure watering setups. A pump may be needed when you require greater flow or pressure, but it must be matched to the storage system, irrigation equipment, power supply, and required lift.
Should a rain barrel have an overflow hose?
It needs some reliable method of handling overflow. An overflow hose or pipe can work if it is adequately sized and directs water to a safe location away from the foundation. Very small tubing may restrict heavy storm flow.
How do I keep mosquitoes out of a rain barrel?
Keep openings covered with intact insect-resistant screening, maintain a secure lid, and prevent standing water in exposed fittings or nearby containers. Inspect screens regularly because damage or gaps can allow mosquitoes to enter.
Does a rain barrel need to be cleaned?
Yes. Sediment and organic material can accumulate over time. Inspect the barrel and clean it as conditions require. Keeping gutters, screens, and other pretreatment components clean can also reduce the amount of debris entering storage.
Is rain barrel water safe for drinking after filtering?
Do not assume so. Roof runoff can contain biological and chemical contaminants, and a single filtration step cannot establish drinking-water safety. Potable rainwater systems require appropriate collection, treatment, maintenance, current laboratory testing, and attention to local health and plumbing requirements.
