Below Ground Tank are widely used for storing water, fuel, chemicals, and other liquids safely underground. These tanks provide a practical storage solution that saves space, improves safety, and protects stored materials from environmental exposure. Many industries such as agriculture, residential water systems, commercial buildings, and fuel stations, rely on underground tanks. However, understanding the types, installation process, and safety requirements is essential before installing one. In this guide, we will explain everything you need to know about below ground tanks, including their benefits, installation process, materials, maintenance, and safety tips.
What Is a Below Ground Tank?
A below ground tank, also known as an underground storage tank (UST), is a container installed beneath the surface of the ground to store liquids such as water, fuel, oil, or chemicals. These tanks are designed to be durable, corrosion-resistant, and capable of withstanding soil pressure and environmental conditions. Underground tanks are commonly used in residential properties. Agricultural irrigation systems. Gas stations. Industrial facilities. Rainwater harvesting systems. Because they are buried underground, they offer space efficiency and environmental protection.
Common Uses of Below Ground Tanks
Below ground tanks are used across many industries because they provide safe and secure storage.
Water Storage
Underground water tanks are commonly used for:
Rainwater harvesting
Household water storage
Irrigation systems
Emergency water reserves
Fuel Storage
Many fuel stations use underground tanks to store:
Petrol
Diesel
Heating oil
Industrial Liquid Storage
Industries use below ground tanks for storing:
Chemicals
Wastewater
Industrial liquids
Fire Protection Systems
Large buildings and facilities often install underground tanks as part of fire sprinkler systems.
Types of Below Ground Tanks
There are several types of underground tanks depending on the material and purpose.
Plastic (Polyethylene) Tanks
These tanks are lightweight, corrosion-resistant, and commonly used for water storage.
Benefits:
Affordable
Easy installation
Resistant to rust
Fiberglass Tanks
Fiberglass tanks are durable and resistant to corrosion, making them ideal for fuel storage.
Benefits:
Long lifespan
Leak-resistant
Suitable for chemical storage
Steel Tanks
Steel tanks are strong and traditionally used for fuel storage.
However, they may require protective coatings to prevent corrosion.
Benefits:
High structural strength
Suitable for large storage capacity
Concrete Tanks
Concrete underground tanks are commonly used for large-scale water storage.
Benefits:
Very durable
Long-lasting
Ideal for large infrastructure projects
Benefits of Installing a Below Ground Tank
Installing a below ground tank offers many advantages.
Space Saving
Because the tank is buried underground, it does not take up valuable surface space.
Improved Safety
Underground storage reduces the risk of accidents, spills, and tampering.
Temperature Stability
Liquids stored underground are protected from extreme temperatures.
Aesthetic Benefits
Since the tank is hidden underground, it does not affect the appearance of your property.
Environmental Protection
Modern underground tanks include leak detection systems that help prevent soil contamination.
Below Ground Tank Installation Process
Installing a below ground tank requires careful planning and professional expertise.
Site Assessment
Before installation, experts evaluate:
Soil conditions
Groundwater levels
Accessibility
Excavation
A hole is dug to accommodate the tank size and required depth.
Base Preparation
A stable base such as sand or concrete is prepared to support the tank.
Tank Placement
The tank is carefully lowered into the excavation using lifting equipment.
Piping and Connections
Pipes, valves, and fittings are connected to ensure proper functionality.
Backfilling
Soil or sand is used to fill the surrounding space and secure the tank.
Final Testing
The system is tested for leaks and operational safety.
Materials Used for Underground Tanks
Choosing the right material is essential for durability and safety.
Common materials include:
Polyethylene
Fiberglass reinforced plastic
Carbon steel
Reinforced concrete
Each material has different strength, cost, and corrosion resistance levels.
Safety Considerations for Below Ground Tanks
Safety is critical when installing and maintaining underground tanks.
Leak Detection Systems
Modern tanks include sensors that detect leaks early.
Corrosion Protection
Protective coatings or cathodic protection help prevent rust.
Ventilation Systems
Fuel storage tanks require proper ventilation to prevent pressure buildup.
Regular Inspections
Routine inspections help detect potential issues before they become serious.
Maintenance Tips for Underground Tanks
Proper maintenance extends the lifespan of a below ground tank.
Important maintenance practices include:
Regular leak testing
Checking pipe connections
Cleaning sediment buildup
Inspecting corrosion protection systems
Monitoring tank pressure levels
Routine maintenance ensures safe and efficient operation.
Common Problems and How to Avoid Them
Underground tanks can experience several issues if not maintained properly.
Corrosion
Steel tanks may corrode over time.
Solution: use protective coatings and inspections.
Leaks
Leaks can cause environmental damage.
Solution: install leak detection systems.
Ground Pressure Damage
Improper installation may cause structural damage.
Solution: follow correct installation procedures.
Below Ground Tank vs Above Ground Tank
| Feature | Below Ground Tank | Above Ground Tank |
|---|---|---|
| Space usage | Saves surface space | Requires surface area |
| Safety | Better protection | More exposure |
| Installation cost | Higher | Lower |
| Maintenance | More complex | Easier access |
Both options have advantages depending on the application.
Cost of Installing a Below Ground Tank
The cost of installing a below ground tank depends on several factors.
Typical cost factors include:
Tank size
Material
Installation complexity
Excavation requirements
Safety systems
Average installation costs can range from $2,000 to $10,000 or more depending on the project.
How to Choose the Right Below Ground Tank
When selecting a below ground tank, consider:
Storage capacity
Material durability
Installation requirements
Local regulations
Maintenance needs
Consulting professionals helps ensure the correct tank choice.
Environmental Considerations
Proper installation and monitoring of underground tanks help prevent environmental contamination.
Key environmental practices include:
Leak monitoring
Soil protection systems
Compliance with environmental regulations
Responsible management protects groundwater and surrounding ecosystems.
Frequently Asked Questions
How long do below ground tanks last?
Most underground tanks last 20–40 years, depending on the material and maintenance.
Are underground tanks safe?
Yes, modern underground tanks are designed with safety features such as leak detection systems and corrosion protection.
Can underground tanks store drinking water?
Yes, specially designed polyethylene or concrete tanks are commonly used for potable water storage.
Do underground tanks require permits?
In many regions, permits and inspections are required before installation.
Conclusion
Below ground tanks are an efficient and reliable solution for storing water, fuel, and other liquids. Their space-saving design, safety advantages, and environmental protection make them a popular choice for residential, commercial, and industrial applications.