Searching For A Durable Underground Water Storage Solution?

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Water is one of the most important resources in our lives. Whether it's used for drinking, washing, gardening, or farming, having a reliable water source is a must. But what if you don’t have enough space above ground? Or do you want a clean and hidden solution?
That’s where Underground Water Storage Solutions come in.
In this article, we’ll explain what underground tanks are, how they work, their benefits, and how they can help in collecting rainwater, saving space, and providing a long-lasting water supply. Whether you are a homeowner or a business owner, this guide will help you find the right underground tank for your needs.
 
What is an underground water storage tank?
An underground water storage tank is a tank that is installed below the ground to store water safely and out of sight. These tanks are strong, durable, and designed to handle soil pressure. They are made from materials like plastic (polyethylene), concrete, or fiberglass.
You can use underground tanks to store:

Clean drinking water

Rainwater for gardening ...
... or washing

Greywater (reused water from baths, sinks, etc.)

Water for fire protection

Water for toilets and irrigation

Underground tanks are ideal for people who want to save space in their garden or need a large storage capacity without a visible tank taking up room.
 
Why Choose an Underground Water Tank?
Let’s look at the main reasons people choose underground storage tanks for their homes or businesses:
 
 Saves Space
One of the biggest benefits is saving space. Since the tank is buried underground, it doesn’t take up any above-ground area. You can use the space above the tank for a garden, lawn, driveway, or even a patio.
 
 Keeps Water Cool and Clean
Underground tanks stay cooler than surface tanks. This helps keep the water fresh and slows down the growth of algae and bacteria.
 Protected From Weather
These tanks are not affected by sunlight, temperature changes, or heavy rain. Being underground also protects them from storm damage or high winds.
 
 Long Lifespan
Underground tanks are built to last. Many tanks last 20–30 years or more with proper care.
 
 Perfect for Rainwater Collection
When paired with a rainwater system, an underground tank can collect and store thousands of liters of water for use in the garden, home, or business.
 
Rainwater Harvesting Underground Tanks
Rainwater Harvesting Underground Tanks are designed to collect rainwater from rooftops and store it safely underground. These systems are popular for both homes and commercial buildings. They help reduce water bills and are better for the environment.
 
How it works:

Rainwater falls on the roof.

It flows through gutters and downpipes.

A filter removes dirt and leaves.

Clean water flows into the underground tank.

A pump brings the water to taps, toilets, or sprinklers when needed.

You can explore a wide range of Rainwater Harvesting Underground Tanks that are easy to install and ideal for saving water at home or work.
 
Best Uses for Underground Water Storage Tanks
Underground tanks can be used for many different things depending on your needs. Let’s take a look at some common uses:
 
 Domestic Use
A domestic underground water tank can store water for:

Flushing toilets

Washing clothes

Watering plants

Cleaning cars

Emergency backup

This is perfect for homes in areas with water restrictions or where mains water is expensive
.
 Commercial Use
Businesses use underground storage tanks for:

Landscape irrigation

Car washes

Cooling systems

Firewater reserves

Underground tanks are safe and hidden and allow businesses to store large volumes of water without losing surface space.
 
 Rainwater Harvesting
Collecting and using rainwater is good for the planet and your wallet. You can use harvested rainwater for:

Gardening

Washing

Toilet flushing

Rainwater harvesting systems are easy to connect with underground tanks and work automatically using pumps and filters.
 
Materials Used in Underground Tanks
Here are the most common types of underground tank materials:
 Plastic (Polyethylene)

Lightweight and easy to install

Long-lasting and rust-free

Best for small to medium homes

 
 Fibreglass

Very strong and resistant to chemicals

More expensive but long-lasting

Good for both domestic and industrial use

 
Concrete

Extremely durable

Heavy and requires professional installation

Often used in large commercial setups

 
Most people choose plastic tanks for ease of use and lower cost, especially when looking for domestic underground water tank options.
 
Sizes and Shapes
Underground tanks come in different sizes—from a few hundred liters to tens of thousands of liters. The size you need depends on how much water you want to store and how much space is available.
 
Common sizes:

1000–2500 litres: Small homes or gardens

5000–7500 litres: Medium homes or multiple uses

10,000+ litres: Large homes, farms, or commercial buildings

 
Shapes:

Slimline tanks: For narrow spaces

Horizontal tanks: Most common for easy digging

Vertical tanks: Used when depth is not an issue

 
When choosing a tank, always think about how much water you’ll use and what it’s for.
 
Installation Tips
Installing an underground tank is not too hard, but you need to follow some rules to make sure it lasts long and works well.
 
Basic steps:

Choose the right spot—away from trees, roots, or underground pipes

Dig the hole—make sure it’s the right size and depth

Prepare the base—add a layer of sand or gravel

Place the tank—lower it carefully into the hole

Connect pipes and filters

Backfill the hole—cover the tank with soil and compact it

 
 Tip: Always check with your local council or water authority before installing a tank. Some areas need approval or have special rules.
 
Maintenance and Cleaning
To keep your underground tank working well, you should take care of it regularly:
 
 Clean the filters
Filters should be cleaned every few months to stop dirt and leaves from getting into the tank.
 
 Check for smells or leaks
Open the tank hatch once in a while and check the inside. If it smells bad or you see damage, call a professional.
 
 Pump maintenance
If you use a pump to move water, make sure it's working properly and not blocked.
 
 Full clean
You can empty and clean the tank every 2–3 years to remove any buildup at the bottom.
 
Costs and Value
The cost of an underground water tank depends on:

Size

Material

Type (standard or rainwater)

Installation

 
Example price ranges:

Small plastic tanks (1000–2500 litres): £400–£800

Medium tanks (5000 litres): £1000–£2000

Large tanks (10,000+ litres): £2500–£5000

While the upfront cost is higher than that of above-ground tanks, underground systems offer long-term savings:

Lower water bills

No damage from UV light

Longer life span

More usable space above ground

It’s a smart investment for homes and businesses alike.
 
Environmental Benefits
Using underground water storage solutions helps protect the environment in several ways:
 
 Less Waste
You use rainwater that would otherwise flow into drains and be wasted.
 
 Conserves Natural Water
Helps reduce the use of mains water, especially during dry months.
 
 Manages Flooding
By collecting rainwater, you reduce the risk of surface water flooding in your area.
Every drop saved makes a difference—especially in areas where water is limited or expensive.
 
Where to Buy Quality Underground Water Tanks
Looking for a reliable, high-quality tank? Visit The Tank Shop—a trusted UK supplier of water tanks for homes, farms, and businesses. They offer:

Strong, UK-made tanks

Easy delivery

Helpful advice and customer support

Tanks that meet UK safety standards

 
Check out their collection of underground water storage tank options to find one that suits your needs and budget.
They also offer full systems for rainwater harvesting underground tanks with filters and pumps for easy use.
 
Conclusion
Underground tanks are a smart and durable solution for anyone looking to store water safely and out of sight. Whether you want to save on your water bill, collect rainwater, or prepare for dry weather, these tanks offer long-term value and peace of mind.
With many sizes and styles available, from small Domestic Underground Water Tank models to large Underground Storage Tanks, there's a perfect choice for every home, garden, or business.
Start saving space, water, and money today by choosing the right underground tank—built to last and built to protect your water supply.

My name is Michel Marsin and i work full time as a freelance writer, editor former social worker. I am passionate about writing articles on different topics.