How to Choose the Right Size Domestic Underground Water Tanks for Your Home

5 min read

Water is an essential resource for every household, and having a reliable and sustainable water supply is crucial for daily living. One way to ensure a continuous water supply is by installing an underground water tank. However, choosing the right size underground water tank for your home can be a daunting task. In this article, we will guide you through the process of selecting the perfect underground water tank size for your domestic water needs. We will discuss factors to consider, important questions to ask, and tips for making the best decision for your home.

Why Choose an Underground Water Tank?

Underground water tanks offer several advantages over above-ground water storage systems. Some of these benefits include:

  • Space-saving: Underground water tanks free up valuable space in your yard or garden, allowing for more efficient use of your property.
  • Aesthetic appeal: Underground water storage systems are hidden from view, preserving the visual appeal of your landscape.
  • Temperature regulation: Underground water tanks maintain a more consistent temperature, reducing the risk of waterborne bacteria and algae growth.
  • Protection from damage: Underground water tanks are less susceptible to damage from weather, vandalism, and accidents.

Factors to Consider When Choosing an Underground Water Tank Size

Water Usage: The first step in determining the right size underground water tank for your home is to assess your household’s water consumption. Consider the number of people living in your home, daily water usage for activities such as cooking, cleaning, and gardening, and any seasonal fluctuations in water demand. This information will help you estimate the necessary water storage capacity for your tank.

Available Space: The size of your underground water tank will also depend on the available space on your property. Consider the dimensions of the area where the tank will be installed and any potential obstacles, such as underground utilities or tree roots. Keep in mind that larger tanks may require more extensive excavation and site preparation, which can impact the overall cost of the project.

Climate and Rainfall: Your local climate and average annual rainfall will also play a role in determining the appropriate size for your underground water tank. In areas with lower rainfall, a larger tank may be necessary to ensure an adequate water supply during dry periods. Conversely, in regions with higher rainfall, a smaller tank may suffice.

Budget: The cost of an underground water tank can vary significantly depending on the size, material, and installation requirements. Determine your budget for the project and consider the long-term savings associated with reduced water bills and a more sustainable water supply.

How to Calculate the Right Size Underground Water Tank for Your Home

To calculate the ideal underground water tank size for your home, follow these steps:

  • Estimate your daily water usage by considering the number of people in your household and the average daily water consumption for various activities.
  • Multiply your daily water usage by the number of days you want your water supply to last. This will give you the required storage capacity in gallons or liters.
  • Consider your local climate and rainfall patterns, adjusting the storage capacity as necessary.
  • Factor in any space constraints or budget limitations to determine the best size for your underground water tank.

Types of Underground Water Tanks

There are several types of underground water tanks available, each with its own advantages and disadvantages. Some common types include:

  • Concrete tanks: These tanks are durable and long-lasting but can be more expensive and challenging to install.
  • Polyethylene (plastic) tanks: These tanks are lightweight, affordable, and easy to install but may not be as durable as other materials.
  • Fiberglass tanks: These tanks are strong, lightweight, and resistant to corrosion but can be more expensive than other options.
  • Steel tanks: These tanks are durable and can withstand high pressures, but they may be susceptible to corrosion and can be more expensive than other materials.

 domestic underground water tanks

Installation and Maintenance Considerations

When selecting an underground water tank, it is essential to consider the installation and maintenance requirements. Some factors to keep in mind include:

  • Access: Ensure that the tank location allows for easy access for maintenance, cleaning, and repairs.
  • Soil conditions: The type of soil on your property can impact the installation process and the tank’s performance. Consult with a professional to determine the best type of tank for your soil conditions.
  • Permits and regulations: Check with your local government to determine if any permits or regulations apply to underground water tank installations in your area.
  • Maintenance: Regular maintenance, such as cleaning and inspecting the tank, is essential to ensure the longevity and performance of your underground water storage system.


Choosing the right size underground water tank for your home is a crucial decision that can significantly impact your domestic water supply and overall quality of life. By considering factors such as water usage, available space, climate, and budget, you can select the perfect underground water tank size for your needs. Additionally, understanding the different types of underground water tanks and their installation and maintenance requirements will help you make an informed decision that best suits your home and lifestyle. With the proper planning and research, an underground water tank can provide a sustainable and reliable water source for your household for years to come.


You May Also Like

More From Author