Installing an underground water tank is a smart way to store water while saving space. Whether you’re using it for home, farming, or business, this guide will help you understand everything you need to know about underground water tank installation. We’ll also cover important topics like permits, safety, and cost.

1. What Is an Underground Water Tank?

An underground water tank is a storage tank buried below the ground. It’s designed to hold rainwater or water supplied from another source. These tanks save space and protect water from heat and sunlight.

They come in different materials like plastic, concrete, and fiberglass. A popular choice these days is underground plastic water tank installation because it’s easier and quicker to set up.

2. Pre-Installation Considerations

Before starting the underground water tank installation, here are a few things to check:

a) Site Selection

Choose a flat and strong location away from tree roots and underground pipes.

b) Soil Type

Test the soil. Some soil types like clay may need extra support for the tank.

c) Water Usage

Know how much water you plan to store. This helps in picking the right tank size.

d) Local Rules and Permits

Check with your local government. You may need a permit before digging or installing the tank.

3. Tools and Materials You’ll Need

Excavator or digging tools
Sand or crusher dust for the base
Tank (plastic, concrete, or fiberglass)
Backfill material (non-rocky soil)
Pipe fittings and valves
Safety gear

4. Step-by-Step Installation Process

Step 1: Get Permits

Always start by checking local laws. You may need permission for underground cistern installation.

Step 2: Mark and Dig the Hole

Mark the area and dig a hole that is slightly bigger than your tank. This gives space to backfill later.

Step 3: Prepare the Base

Add a layer of sand or crusher dust. Make it flat and level. This helps prevent the tank from shifting.

Step 4: Place the Tank

Carefully lower the tank into the hole. Make sure it sits evenly.

Step 5: Connect the Pipes

Attach pipes to bring in water and let water out. Use strong fittings to avoid leaks.

Step 6: Backfill the Hole

Fill around the tank with soft soil or sand. Compact it lightly in layers.

Step 7: Test the System

Fill the tank with water and check for leaks or issues.

5. Safety Tips

Wear gloves, boots, and a helmet
Never enter a deep hole without support
Keep children and pets away from the site
Use proper lifting tools when placing the tank

6. Cost of Installation

The underground water tank installation cost depends on the tank size, material, and labor charges. On average:

Plastic tank: Lower cost, easy setup
Concrete tank: Durable but heavy and more costly
Labor: Costs depend on digging depth and soil type

If you compare this with above ground water tank installation, the cost may be higher, but underground tanks save space and last longer.

7. Maintenance After Installation

Keep your tank clean to avoid waterborne diseases. You can book professional tank cleaning services to keep your water safe.

We also recommend reading more on Underground Water Tank Cleaning, Overhead Water Tank Cleaning, and explore our local services:

Also check our guide to underground water tanks for more helpful tips.

Final Thoughts

Underground water tank installation is a great way to manage your water needs smartly and safely. It might cost a bit more than above ground water tank installation, but it lasts longer and keeps water cleaner. Whether you choose underground plastic water tank installation or concrete, make sure to follow safety rules and hire experts when needed.

If you’re planning underground water storage tank installation, this guide should give you the confidence to start the process smoothly!

Step-by-Step Guide to underground water tank installation