Plastic Underground Tanks

Our Plastic Underground Tanks are robust, reliable, and 100% rust-resistant, making them an ideal choice for domestic residences, commercial premises, and industrial sites. We stock and supply one of the largest selections of plastic underground tanks in the UK, with capacities ranging from 195 Litres to over 35,000 Litres in our exclusive online range. Constructed from high-density polyethylene (HDPE), a material recognised for its strength and durability, our plastic underground tanks are an investment that could last 20 years or more with regular maintenance. We offer a choice of space-saving designs to suit every property, and all our products come with a warranty for peace of mind. Whether you are looking for a round underwater water tank for watering your garden or a complete underground rainwater harvesting system for agricultural environments, you’ll find it here at Water Tanks UK. Many of our plastic underground water tanks include a direct pressure system, which pumps harvested rainwater directly to your chosen outlet. All our below-ground water tanks are UK and EU-approved.