Choosing the Right Underground Water Tank for Your Property

Posted by Callum Vallance-Poole, on January 13, 2025.

Platin XXL Shallow Dig Underground Holding Tank

Selecting the right underground water tank for your property is a critical decision, especially for homeowners, self-builders, and those committed to sustainable living. Whether you’re looking to harvest rainwater, store potable water, or manage stormwater, an underground water tank can provide an efficient, long-term solution.

In this comprehensive guide, we’ll cover everything you need to know about choosing the right underground water tank for your property. From understanding different tank types to assessing your property’s needs and considering installation factors, this guide will help you make an informed decision. By the end, you’ll have a clear path toward selecting the perfect tank that meets both your sustainability goals and practical requirements.

What is an Underground Water Tank?

Underground water tanks are storage units installed below ground level, designed to collect and store water. They can be used for a variety of purposes such as rainwater harvesting, storing potable water, or stormwater management. The key advantage is that they don’t occupy surface space, keeping your property’s aesthetic intact while serving a crucial functional role.

Key Benefits of Installing an Underground Water Tank

Investing in an underground water tank offers multiple benefits, including:

  • Space-saving: Maximises land use, making it ideal for small or urban properties.
  • Sustainability: Reduces dependence on mains water supply by harvesting rainwater.
  • Aesthetic Appeal: Hidden from view, allowing landscapes and outdoor areas to remain visually uncluttered.
  • Longevity: Most tanks are made from durable materials like concrete or polyethylene, designed to last decades with proper maintenance.

Types of Underground Water Tanks

Different materials and designs cater to varying needs. Here’s a breakdown of the most common types:

  • Concrete Tanks: Known for their durability and strength, these tanks are ideal for large-scale storage and long-term use. However, they require professional installation.
  • Polyethylene (Plastic) Tanks: Lightweight and easier to install, these tanks are corrosion-resistant and can be made from recycled materials.
  • Fiberglass Tanks: Resistant to rust and corrosion, making them ideal for storing potable water. They are also lightweight but can be more expensive.
  • Bladder Tanks: Flexible tanks often used in temporary installations or areas with limited space.

Factors to Consider When Choosing an Underground Water Tank

When selecting the right tank for your needs, it’s essential to consider several key factors:

  • Purpose of the Tank: Are you using it for rainwater harvesting, potable water storage, or stormwater management? Each purpose requires different tank features and capacities.
  • Capacity: Consider your household or property’s water usage and local rainfall patterns to estimate the required tank size, for rainwater harvesting take a look at our rainwater harvesting calculator.
  • Material Durability: Choose a material that suits the intended water type (e.g., potable or non-potable) and the soil conditions in your area.
  • Location: Ensure there’s enough space for installation, including accessibility for maintenance.
  • Budget: Balance upfront costs with long-term benefits, such as reduced water bills or environmental impact.

Installation Considerations

Proper installation is key to the performance and lifespan of an underground water tank. Here’s what you need to know:

  • Soil and Site Assessment: Before installation, the site should be assessed to determine soil type, groundwater levels, and any potential excavation challenges.
  • Excavation Requirements: Installing a tank requires significant digging. Make sure you work with a professional to handle excavation safely and in compliance with local regulations.
  • Tank Placement: Place the tank where water runoff or rainwater collection can be maximised, such as beneath a driveway or garden.

Maintenance and Lifespan

Maintenance is relatively low for underground water tanks, but it’s crucial to ensure longevity:

  • Regular Inspections: Check for leaks, cracks, or blockages in the inflow/outflow pipes.
  • Water Quality Monitoring: If storing potable water, periodically test water quality.
  • Debris Removal: Clear debris from the catchment area to prevent clogging or contamination.

With proper maintenance, underground water tanks can last between 15 to 50 years, depending on the material and installation quality.

Choosing the right underground water tank for your property is a decision that requires careful consideration of your needs, property characteristics, and long-term goals. By understanding the different tank types, installation requirements, and benefits, you can make a choice that supports both sustainability and functionality.

If you’re ready to explore your options or need expert advice, contact us today for a consultation. For more information on rainwater harvesting and stormwater management, check out our related articles and resources.

Explore our range of underground water tanks or get in touch with a member of our team to discuss your specific needs.

FAQ’s

Can I use an underground water tank for drinking water?

Yes, but you must choose a tank material safe for potable water and install filtration and treatment systems to ensure water quality.

How much water can I store in an underground tank?

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Tank sizes vary, ranging from a few hundred litres to several thousand. Calculate based on your property’s water needs and expected rainfall.

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