Bunded Water Tanks

Bunded Water Tanks — Safe, Compliant, and Reliable Liquid Storage

Bunded water tanks give you a secure, regulation-compliant way to store large volumes of water and liquid chemicals. Each tank uses a tank-within-a-tank design. The inner tank holds the liquid, while the outer bund acts as a secondary containment layer. Consequently, if the inner tank leaks, the bund captures the spill and prevents it reaching the ground or drains. Furthermore, this design meets the environmental and workplace safety standards required for commercial, agricultural, and industrial storage sites. For non-bunded large-capacity storage, see our 6000 to 25000 Litre Polyethylene Water Storage Tanks. For guidance on secondary containment requirements, refer to the Environment Agency pollution prevention guidance, which covers spill prevention and secondary containment requirements for businesses in England.

In short, bunded water tanks suit rainwater harvesting, agricultural irrigation, commercial backup supply, industrial process water, and any site where a spill would cause environmental damage or regulatory risk.

Key Features and Benefits of Bunded Water Tanks

These tanks offer several clear advantages over single-skin storage. The features below explain what makes bunded water tanks the right choice for compliant liquid storage. For example:

• Double-wall bunded design — The outer bund holds 110% of the inner tank’s capacity. Consequently, a full inner tank failure causes no environmental spill, keeping the site compliant and the surrounding ground clean.
• Regulatory compliance — Meets strict industry standards for environmental protection and workplace safety. Therefore, these tanks suit commercial and industrial sites where compliance with Environment Agency and HSE requirements is mandatory.
• UV-stabilised polyethylene or steel construction — Resists cracking, rust, and outdoor weathering. Moreover, this gives a long service life without painting, coating, or corrosion treatment.
• Wide capacity range — Available from small domestic units up to large industrial-scale tanks. Furthermore, this means you can match the tank to your exact storage requirement without over-specifying.
• Easy leak detection — The visible bund space makes it straightforward to spot any weeping from the inner tank before it becomes a serious problem. As a result, maintenance stays simple and reactive repairs stay low-cost.
• Access lids and inspection points — Built-in access makes cleaning, inspection, and maintenance quick and safe. Overall, this keeps the tank in good condition with minimal effort over its service life.
• Cost-effective long-term — Higher upfront cost than single-skin tanks, but the ability to prevent costly spills, avoid regulatory fines, and extend system life makes these tanks the more economical choice over time. In addition, many insurers require bunded storage for certain liquid types, so fitting one can reduce premiums.

Applications of Bunded Water Tanks

These tanks suit a broad range of settings where secure, compliant liquid storage is needed. The following examples show where bunded water tanks deliver the most value. For instance:

• Rainwater harvesting — Collect and store roof runoff at domestic and commercial properties for irrigation, toilet flushing, and non-potable uses. The bunded design gives added protection on sites near watercourses or sensitive ground.
• Agricultural irrigation and chemical storage — Store water reserves and liquid fertilisers safely on farms. Furthermore, bunded storage meets the Environment Agency’s requirements for storing agricultural chemicals near watercourses.
• Commercial backup supply — Maintain water reserves in offices, hotels, and schools to keep operations running during mains supply interruptions. Moreover, the compliant design suits sites where planning or insurance conditions require secondary containment.
• Industrial process water — Store process water, cooling water, and chemical solutions in factories and manufacturing plants. In addition, bunded containment protects drains and groundwater from accidental spills of process chemicals.
• Fuel and chemical storage — Suitable for a range of liquids beyond water, including certain fuels and chemicals where secondary containment is a legal requirement. Always check chemical compatibility with the tank material before filling.

Installation and Long-Term Value

Installing bunded water tanks is straightforward. Prepare a flat, load-bearing base before delivery. Position the tank using a forklift or crane for larger units, then connect the inlet, outlet, and overflow fittings to your pipework. Furthermore, fit a lockable lid to prevent unauthorised access and keep the stored liquid clean.

Maintenance is simple. Inspect the bund space regularly for signs of liquid from the inner tank. In addition, clean the interior annually and check all fittings and lids for wear or damage. Overall, polyethylene tanks need no painting or rust treatment, so upkeep costs stay very low over many years of service.

From a cost point of view, the investment in a bunded tank pays back quickly through avoided spill clean-up costs, regulatory compliance, and lower insurance risk. Moreover, a well-maintained bunded tank lasts for decades with minimal intervention. In short, our bunded water tanks give you a safe, compliant, and cost-effective storage solution for water and liquid chemicals across domestic, agricultural, commercial, and industrial sites. We hold strong stock levels and offer fast delivery across the UK.