How do I choose a water tank supplier in the UAE?

Look for UAE Municipality certification, a physical warehouse address, and stock across multiple tank types. Khazzan.ae supplies certified PVC plastic, GRP fiberglass, insulated, underground, septic and panel tanks from our Al Qouz warehouse, delivered across all 7 emirates. Call or WhatsApp +971509583173.

Where can I buy a water tank in UAE?

Order directly at https://khazzan.ae or by calling/WhatsApp +971509583173. Delivery covers Dubai, Abu Dhabi, Sharjah, Ajman, Ras Al Khaimah, Fujairah, and Umm Al Quwain.

What sizes of water tanks are available in UAE?

Sizes run from 50 US Gallons (190 Liters) up to 20,000 US Gallons (75,700 Liters). PVC plastic tanks cover 50 - 6,000 USG, GRP fiberglass covers 300 - 20,000 USG, and panel tanks are available in custom sizes beyond that.

Are Khazzan's water tanks food-safe and municipality approved?

Yes. Every tank is manufactured from food-grade, non-toxic materials approved for potable water storage, carries UAE Municipality Certification, and is sourced from ISO 9001:2015 compliant manufacturers.

What does a water tank cost in Dubai?

Pricing depends on material and capacity. WhatsApp +971509583173 or visit khazzan.ae for current pricing against your required size.

What warranty comes with a Khazzan tank?

PVC plastic tanks carry a 5-year manufacturer warranty, GRP fiberglass and panel tanks carry 2 years, and GRP septic tanks carry 1 year. All tanks hold UAE Municipality Certification.

What is the wall of the underground polyethylene tank made of?

The wall has three layers. The outer layer is a black solid skin of UV-stabilised food-grade polyethylene, which also acts as an additional UV stabiliser. The middle layer is clear polyethylene foam that adds thermal insulation and stiffness. The inner layer is a white solid polyethylene skin that resists bacterial growth and keeps the tank visible from inside.

What do I need to install with the tank?

The installation drawing on this page shows the full setup: a compacted sand bed under the tank, sand fill around it, a concrete frame supporting a double sealed manhole with a threaded cover, an air vent pipe, a water supply line with a gate valve, a float valve, an overflow pipe, a gate valve and union on the pump line, and a foot valve at the bottom of the suction pipe. Sleeve pipes are filled with rubber silicone where they pass through the wall.

Is there a laboratory certificate for the tank?

A laboratory certificate is available for the tank. Ask us on WhatsApp and we will share it with your quotation.

What is an underground water tank?

An underground water tank is a water storage vessel built specifically for installation below ground level. Unlike standard above-ground tanks, underground tanks have reinforced ribbed exterior walls that handle the weight of the soil pressing down and around them. In the UAE, they are commonly used for residential water storage, irrigation reserves, rainwater harvesting, and as ground-level cisterns that feed rooftop distribution systems. They keep water cooler than rooftop tanks and take up no surface space at all.

What material are underground water tanks made from?

Khazzan's underground water tanks are made from virgin polyethylene - the same food-grade plastic used in above-ground tanks, but manufactured with a ribbed exterior profile that is purpose-built for underground burial. The ribbed walls distribute soil pressure evenly around the tank, preventing deformation. The smooth inner surface is food-grade certified, keeping stored water clean and safe.

Can a standard above-ground polyethylene tank be buried underground?

No - never. Standard above-ground tanks (3-layer, 4-layer, 5-layer) are built to hold water pressure from the inside, but they are not designed to resist external soil pressure from the outside. Burying one will cause it to collapse or crack, leading to water loss and possible ground subsidence. Always use a purpose-built underground tank with the correct ribbed exterior wall design.

How deep should an underground water tank be buried?

In most UAE installations, the top of the tank sits 300–600mm below finished ground level. This gives enough soil cover for protection and insulation while keeping the manhole access close enough to the surface for easy maintenance. The exact depth depends on your pipe invert levels, the tank's inlet and outlet positions, and the finished ground level on your site. A professional installer will confirm the right depth for your specific conditions.

What size underground water tank do I need?

As a general guide for UAE homes: Studio or 1-bedroom: 365–500 USG. 2–3 bedroom villa: 500–750 USG. 4–5 bedroom villa: 750–1,000 USG. Large villa with garden irrigation: 1,000–1,500 USG. Commercial properties: 1,500–2,300 USG. The right size depends on your daily water use, how reliable your supply is, and whether the underground tank is your main storage or a top-up cistern below a rooftop tank. Contact Khazzan with your property details for a personal recommendation.

What is the difference between an underground water tank and a septic tank?

An underground water tank holds clean drinking water - it connects to your water supply and feeds your building's plumbing. A septic tank is a wastewater vessel that collects sewage and treats it before discharge. The two are completely different products and must never be swapped or confused. Using a septic tank for water storage, or connecting a water tank to a sewage line, is a serious health hazard.

How do underground water tanks work?

Water enters the tank through an inlet pipe from a mains supply, water tanker, or rainwater system. It is stored below ground where the surrounding soil keeps temperatures moderate. A pump then draws water up to a rooftop tank or directly into the building's water system. A float switch or level sensor controls the pump to stop it running dry. Overflow and vent pipes manage pressure, and the manhole cover gives you access for inspection and cleaning without any digging.

Do I need a pump for an underground water tank?

Yes, in almost all UAE installations you will need a pump to lift the water up to where it is needed. The pump is usually a submersible pump placed inside the tank, or a surface pump in a small chamber next to it. The right pump size depends on how much water flow you need and how high it has to travel. WhatsApp Khazzan on +971509583173 and we can advise on the right pump setup for your installation.

How is an underground water tank installed?

The basic steps are: dig the pit larger than the tank to allow working room; lay a 150–200mm compacted sand or pea gravel bed at the bottom; lower the empty tank into position using an excavator or lifting slings; check it is level; connect the inlet, outlet, overflow, vent, and pump pipes; backfill around the tank with clean sand or pea gravel in layers (avoid sharp stones and heavy compaction directly against the tank wall); position the manhole at finished ground level; fill with water and check all connections before completing the backfill over the top.

Does an underground water tank need to be anchored?

In most parts of the UAE, the groundwater table is low enough that buoyancy is not a concern for standard residential installations. However, in coastal areas or sites near wadis where groundwater is higher, an empty tank can be pushed upward by groundwater pressure. In these situations, concrete anchor straps over the tank or a concrete base with hold-down bolts should be used. Always discuss your site's groundwater conditions with your installer before finalising the design.

How do you clean an underground water tank?

Close the inlet supply, drain the tank, then open the manhole access. Inspect and scrub the interior surfaces with a food-safe disinfectant solution. Remove any sediment from the bottom using a suction pump or by hand with appropriate tools. Rinse thoroughly with clean water, then restore all connections and refill. UAE health guidelines recommend cleaning every 6–12 months. Note: confined space safety rules apply - never enter an underground tank alone.

Can an underground water tank be used for rainwater harvesting in UAE?

Yes, and it is the ideal choice. Storing rainwater underground minimises evaporation, which matters a lot in the UAE's hot climate. The below-ground environment also protects collected water from contamination and keeps it cooler. While annual rainfall in the UAE is low, heavy localised downpours do occur. With proper filtration, a first-flush diverter, and UV treatment, harvested rainwater can supplement garden irrigation and reduce your reliance on tanker deliveries.

How long does an underground water tank last?

Khazzan underground water tanks come with a 10-year manufacturer warranty. With correct installation on a proper sand bed and regular cleaning every 6–12 months, these tanks can last 15–20 years or more. Virgin polyethylene does not corrode, rust, or react with soil chemistry. The main factors that shorten tank life are poor installation (wrong backfill material, no sand bed) and neglecting regular cleaning.

What is the maximum size underground polyethylene tank available?

The largest standard-stock underground polyethylene tank is approximately 2,300 USG (8,706 litres). If you need more capacity, two or more tanks can be connected in parallel to multiply the total storage. Contact Khazzan via WhatsApp on +971509583173 for guidance on the best solution for your required capacity.

Can I install an underground water tank myself?

The installation involves excavation equipment, knowledge of pipe connections, and an understanding of soil conditions and backfill requirements. In the UAE, connections to your building's potable water system typically need a licensed plumber. While the excavation and tank placement can be handled by a general contractor with the right equipment, incorrect installation - wrong sand bed, wrong backfill, uneven levelling - can lead to tank deformation and contamination. Khazzan can point you toward trusted installers in your area.

Is an underground water tank safe for drinking water?

Yes. All Khazzan underground tanks carry UAE Municipality certification and have food-grade inner surfaces that do not rust, corrode, or leach into the water. For consistently safe drinking water, use a certified tank, clean it every 6–12 months, keep the manhole sealed, and make sure your water supply comes from a reliable certified source. Water stored underground is generally cooler and safer than water in rooftop tanks during UAE summer.

Does an underground tank affect my house foundations?

Not if installed at the correct distance. UAE municipality guidelines typically require at least 3 metres of clearance from building foundations. This prevents overflow or fitting leaks from saturating the foundation soil, and ensures the excavation does not undermine any existing structures. Always confirm the required clearance with your local municipality, and get a structural engineer's opinion if the tank needs to go close to any existing or planned foundations.

Do underground tanks need ventilation?

Yes. A vent pipe is essential. As water is pumped out of the tank, air must be able to enter to replace it - without a vent, you get vacuum effects that can stop the pump working. When the tank fills, the vent also lets air escape. The vent pipe should exit above ground level, be fitted with an insect mesh to keep out mosquitoes and debris, and be positioned away from any contamination sources. A tank without proper ventilation will have both performance and water quality problems.

How much does an underground water tank cost in UAE?

Prices vary by size and delivery location. Larger tanks cost more, and the tank price does not include excavation, installation labour, pump, pipework, or civil works - these are quoted separately based on your site. WhatsApp Khazzan on +971509583173 with your required size and location for a current price.

How do I know when my underground tank is full?

The most common method is a float switch inside the tank that automatically cuts off the inlet valve when the water reaches the maximum level. For more detailed monitoring, an ultrasonic or pressure sensor gives a continuous reading that can connect to a display panel or building management system. For a simple manual check, a calibrated dip rod through the manhole gives you an instant reading. If you have a pump, a low-level float switch is equally important - it stops the pump before it runs dry.

Can an underground water tank overflow?

Yes, if it is not properly set up. Every underground tank should have an overflow pipe at the maximum fill level that discharges safely to a drain or soakaway, plus an inlet float valve or solenoid valve that stops filling automatically when the tank is full. Without these, an overflowing tank will saturate the surrounding ground and can cause movement or damage to nearby structures.

Why choose Khazzan for underground water tanks in UAE?

Khazzan supplies Made in UAE virgin polyethylene underground water tanks with a 10-year warranty, UAE Municipality Approval, and ISO 9001, ISO 14001, and ISO 45001 certifications. We stock sizes from 365 USG to 2,300 USG and deliver across all 7 UAE emirates. Our team will help you choose the right size, advise on installation requirements, and make sure you are fully compliant with UAE municipality rules. WhatsApp +971509583173 for a free quotation.

Can multiple underground tanks be connected together?

Yes. Two or more tanks can be joined with interconnecting pipework to increase your total storage. For example, two 2,300 USG tanks give you 4,600 USG of underground storage. All tanks in the system share a common inlet, outlet, overflow, and vent through a manifold arrangement. This is the most practical way to get more than 2,300 USG underground without custom fabrication, and it keeps installation straightforward.

What happens to an underground tank in an earthquake?

UAE is in a region of low-to-moderate seismic activity. Standard underground tank installations are not typically designed to specific seismic specifications for residential use. In the unlikely event of significant seismic activity, the concern for underground tanks is differential soil settlement - uneven movement of soil around the tank that could stress the pipe connections at the tank fittings. Flexible pipe connections at the inlet and outlet points are recommended to absorb minor ground movement without transmitting stress to the tank fittings. For critical infrastructure applications requiring seismic design, consult a structural engineer.

Khazzan underground polyethylene water tank, black ribbed moulded tank with vertical neck and base flange

Made in UAE · UAE Municipality Certified · 10-Year Warranty · ISO 9001 / 14001 / 45001

Underground Water Tanks UAE

Name: Khazzan - Water Tanks UAE
Address: Al Qouz Industrial Area 3, Dubai, 00000, AE
Telephone: +971509583173
Price range: AED 200 - AED 50,000

Khazzan supplies UAE Municipality certified Polyethylene Underground Water Tanks engineered for below-ground installation. Ribbed exterior construction for soil load resistance, smooth food-grade inner liner, manhole access as standard. Available from 365 USG to 2,300 USG. Delivered across all 7 UAE emirates.

365–2,300 USGMade in UAE10-Year WarrantyCarries 2 Cars + SoilCooler Water TempsUAE Municipality Certified

Why Underground Water Storage for UAE?

In UAE's extreme climate, where to put your water tank is as important as what type to buy. Rooftop tanks face direct summer sun - water temperatures can reach 50–55°C, significantly increasing bacterial risk and reducing water quality. Underground tanks solve this completely: buried below ground, the surrounding soil acts as natural insulation, keeping water temperatures substantially lower year-round.

Underground installation also preserves all of your surface space - no tank visible in the garden, no structural load on the roof, no access required for a rooftop plant room. For UAE villas where landscaping, driveways, and outdoor living areas are important, an underground water tank is the most aesthetically and practically efficient storage solution.

Khazzan's underground tanks are purpose-built for burial - with ribbed or corrugated exterior walls engineered to distribute soil pressure, food-grade inner surfaces certified by UAE Municipality, and integrated manhole access for inspection and maintenance without excavation.

🌡️

Cooler Water

Underground soil insulation keeps water significantly cooler than rooftop tanks in UAE summer - improving quality and reducing bacterial risk.

🏡

Zero Visual Impact

Completely hidden below ground. No tank visible in garden, courtyard, or driveway. Full surface space available for landscaping or paving.

☀️

UV Protected

Zero UV exposure underground. No surface degradation, no fading, no impact from UAE's extreme summer solar radiation.

Important: Standard above-ground polyethylene tanks (3-layer, 4-layer, 5-layer) must NEVER be buried underground. They are not engineered for external soil pressure and will deform or collapse. Only purpose-built underground tanks with ribbed/reinforced exterior walls are rated for below-ground installation.

Khazzan underground polyethylene water tank, black moulded one-piece tank with ribbed body and 50 cm vertical neck

Special Features

✓ Corrosion proof
✓ Fungus and bacterial proof
✓ Made from food-grade approved materials
✓ Dubai Municipality approved
✓ Low maintenance and long life
✓ No risk of contamination
✓ Easy to clean and maintenance free
✓ Moulded in one piece with no joints, including a 50 cm vertical neck
✓ Very strong body
✓ Liner load of 3,500 kg/m and total load of 7,500 kg when empty
✓ Can be installed under a car parking area, carrying two cars plus soil on top even when empty, with no supporting chamber or concrete foundation
✓ Warranted for 10 years
✓ Laboratory certificate available
✓ Threaded sealed lid cover

Three-Layer Wall Construction

1. Outer layer: black solid skin

UV-stabilised polyethylene with a food-grade black colour that acts as an additional UV stabiliser.

2. Middle layer: clear polyethylene foam

Provides thermal insulation and improves the stiffness of the tank wall.

3. Inner layer: white solid skin

Works the same way as the outer layer, resists bacterial growth, and keeps the inside of the tank visible.

Cut-away of the three-layer wall of an underground polyethylene water tank: black outer skin, clear foam middle layer, white inner skin

Installation Drawing

Typical installation of an underground polyethylene water tank: a compacted sand bed, sand fill around the tank, a concrete frame supporting a double sealed manhole with a threaded cover, and the water supply, air vent, overflow and pump lines with their valves. The end view and side view show the tank in the excavation below finished floor level.

Technical Specifications

Material	Virgin Polyethylene (PE) + UV Stabilizer - food-grade, non-toxic, purpose-built for underground burial
Wall Construction	Ribbed / corrugated exterior for soil load distribution and structural strength
Inner Surface	Smooth food-grade virgin polyethylene - certified for potable water storage
Origin	Made in UAE
Sizes Available	365 USG to 2,300 USG (1,380L to 8,706L) - standard stock sizes
Custom Sizes	Contact Khazzan for non-standard sizes and project-specific requirements
Installation Depth	Top of tank typically 300–600mm below finished ground level
Construction	Moulded in one piece with no joints, including a 50 cm vertical neck
Wall Structure	3 layers: black UV-stabilised polyethylene outer skin, clear polyethylene foam middle layer, white polyethylene inner skin
Load Capacity (empty tank)	Liner load of 3,500 kg/m and total load of 7,500 kg
Vehicle Loading	Can be installed under a car parking area and carry the load of two cars plus the soil on top, even when empty, without a supporting chamber or concrete foundation
Lid	Threaded sealed lid cover
Access	Manhole and inspection access included on all tanks
Fittings	Inlet, outlet, overflow, vent, and manhole access as standard
Temperature Range	-20°C to +60°C
Warranty	10 Years
Certifications	Dubai Municipality Approved · UAE Municipality Approved · ISO 9001:2015 (Quality) · ISO 14001:2015 (Environmental) · ISO 45001:2018 (Health & Safety) · Laboratory certificate available on request
Applications	Potable water · Rainwater harvesting · Irrigation reserve · Fire reserve

Available Sizes

365–2,300 USG (1,380–8,706 Liters)

365 USG1,380 L 500 USG1,893 L 750 USG2,839 L 1,000 USG3,785 L 1,500 USG5,678 L 2,300 USG8,706 L

Need a larger size? Contact Khazzan via WhatsApp on +971509583173 for project-specific requirements.

Benefits of Underground Water Tanks

Strong Enough for Parking Areas

The tank can carry a liner load of 3,500 kg/m and a total load of 7,500 kg when empty. It can be installed under a car parking area and carry the load of two cars plus the soil on top, even when empty, without a supporting chamber or concrete foundation.

Moulded in One Piece

The body, including the 50 cm vertical neck, is moulded in a single piece with no joints, so there are no seams to leak or fail.

Three-Layer Wall

A black UV-stabilised outer skin, a clear polyethylene foam middle layer for thermal insulation and stiffness, and a white inner skin that resists bacterial growth and keeps the inside of the tank visible.

Fungus and Bacterial Proof

The material resists fungus and bacterial growth, so there is no risk of contamination of the stored water.

Threaded Sealed Lid

A threaded, sealed lid cover keeps the tank closed against dust, insects and surface water.

Engineered for Below-Ground Burial

Underground polyethylene tanks are purpose-designed with ribbed or corrugated exterior walls that distribute soil overburden load evenly around the tank - preventing deformation under the pressure of backfilled ground above.

Preserves Surface Space Completely

With the entire tank buried below ground level, the surface above can be used for landscaping, parking, paving, or building access. No visual intrusion, no above-ground footprint. Ideal for UAE villas where garden and courtyard aesthetics matter.

Cooler Water Temperatures

Underground installation insulates stored water from UAE's extreme surface temperatures. While rooftop tanks can reach 55°C+ in summer, underground tanks maintain significantly cooler water temperatures year-round - improving water quality and reducing bacterial risk.

Protected from UAE Weather and UV

Buried underground, the tank is completely protected from UV degradation, extreme solar heat, sandstorms, and physical damage. Above-ground tanks exposed to UAE summer sun degrade over time - underground tanks are shielded from all of these factors.

Food-Grade Inner Surface

The smooth food-grade polyethylene inner surface is UAE Municipality certified for potable water storage. It does not rust, leach, or corrode in contact with stored water - safe for drinking water, irrigation water, and fire reserve storage.

Corrosion-Free Permanently

Polyethylene does not corrode in soil, does not rust, and is not affected by groundwater chemistry. Unlike steel tanks, no internal or external coating is needed. The material holds its integrity in UAE's alkaline and saline soil conditions.

Watertight Construction

Single-piece moulded polyethylene construction with no welded seams or bolted joints in the main tank body. No leakage of stored water into the surrounding soil, and no groundwater gets in.

Lightweight - Easy Installation

Despite their large capacity, underground polyethylene tanks are remarkably lightweight empty. A 1,000 USG tank can typically be handled by a small excavator or manual lifting, without the heavy crane equipment needed for concrete or GRP underground tanks of equivalent size.

Manhole Access for Maintenance

All Khazzan underground tanks include a manhole access port, allowing visual inspection, cleaning, and maintenance without excavation. Regular inspection and cleaning is simple through the manhole without disturbing the surrounding ground.

Fast Installation

Underground polyethylene tanks arrive at site ready to install - no on-site fabrication, concrete pouring, or curing time. Excavate, prepare the sand bed, lower the tank, connect pipework, and backfill. Residential sizes can typically be installed in a single day.

UAE Municipality Certified

All Khazzan underground water tanks carry UAE Municipality certification for potable water storage - the legal requirement for water tanks used in UAE residential and commercial buildings across all seven emirates.

Suitable for Rainwater Harvesting

Underground tanks are the ideal collection vessel for rainwater harvesting systems in UAE. Though annual rainfall is limited, collected rainwater stored underground provides a supplementary supply for garden irrigation, reducing reliance on mains or tanker water.

Applications

Underground water tanks serve wherever below-ground storage, temperature control, or surface space preservation is required:

✔ Residential Villa Water Storage

✔ Garden Irrigation Reserve

✔ Rooftop Tank Supplementary Cistern

✔ Rainwater Harvesting

✔ Fire Fighting Reserve (smaller)

✔ Potable Water Buffer

✔ Apartment Building Ground Reserve

✔ Farm Water Storage

✔ Landscaping Irrigation

✔ Construction Site

✔ Mosque & Community

✔ School Grounds

✔ Remote Villa / Farm

✔ Emergency Water Reserve

✔ Pump Station Sump

Underground vs Above-Ground - Which is Right?

Factor	Underground Tank	Rooftop Tank (Above-Ground)
Water temperature (UAE summer)	Much cooler - soil insulation	45–55°C in direct sun
Visual impact	✔ Zero - completely hidden	Visible on roof or ground
Surface space used	✔ None	Roof or ground footprint
UV exposure	✔ Zero	High - requires UV stabilisation
Bacterial risk (summer)	✔ Lower - cooler water	Higher at 45–55°C
Installation complexity	Excavation required	Simple above-ground placement
Pump required?	Yes - to lift water up	Gravity feed to building (often)
Maintenance access	Through manhole at grade	Rooftop or ground access
Max standard size	2,300 USG	6,000 USG
Best for	Villas, gardens, quality-focused projects	Quickest and simplest installation

Frequently Asked Questions

Everything people ask about underground water tanks in UAE - answered.

Related Products

GRP Fiberglass Water Tanks →PVC Plastic Water Tanks →Septic Tanks →Panel Tanks →

Get a Quote Today

Tell us your required capacity, property type, and installation location - we'll confirm the right underground tank and pricing for your project.

Al Qouz Industrial Area 3, Dubai · Mon–Sat 8AM–7PM

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