Plastic Water Tanks - Underground
Plastic Water Tanks - Underground - Image 2

Underground Plastic Water Storage Tanks — Potable & Non-Potable

At OTIS Tanks, we supply a comprehensive range of underground plastic water storage tanks for both potable and non-potable applications — from 800 litres up to 10,000 litres. Installed below ground, these tanks are ideal where space is limited, aesthetics matter, or a discreet installation is required, freeing the surface for other uses whilst providing reliable, protected water storage beneath.

More about this product

Manufactured in the UK from high-density UV-stabilised polyethylene (HDPE) in a single rotational mould for maximum strength, integrity and resistance to ground loadings, these tanks are stress-free, joint-free, corrosion and rust-resistant and built to last. Potable models are manufactured from WRAS-approved polymer and are CAT5 compliant, making them suitable for mains water connection and drinking water storage. Non-potable models are available for rainwater harvesting, irrigation, greywater recycling and general below-ground liquid storage.

• 800L Vertical  |  Dia: 1,150mm  H: 1,150mm  |  32mm & 50mm pipework options  |  Potable & Non-Potable

• 1,100L Vertical  |  Dia: 1,020mm  H: 1,434mm  |  32mm & 50mm pipework options  |  Potable & Non-Potable

• 1,500L Horizontal  |  L: 1,400mm  W: 1,580mm  H: 1,560mm  |  Potable & Non-Potable

• 1,700L Vertical  |  Dia: 1,100mm  H: 2,400mm  |  32mm & 50mm pipework options  |  Potable & Non-Potable

• 2,000L Vertical  |  Dia: 1,150mm  H: 2,900mm  |  32mm & 50mm pipework options  |  Potable & Non-Potable

• 3,500L Horizontal  |  L: 2,480mm  W: 1,580mm  H: 1,940mm  |  Potable & Non-Potable

• 5,000L Horizontal  |  L: 2,480mm  W: 2,030mm  H: 2,390mm  |  Potable & Non-Potable

• 10,000L Horizontal  |  L: 3,980mm  W: 2,180mm  H: 2,540mm  |  Potable & Non-Potable

All Tanks

• Single rotational mould — stress-free, joint-free construction

• High-density UV-stabilised polyethylene (HDPE) construction

• Impact, corrosion & rust-resistant — designed for ground loadings

• UK manufactured — 10-year manufacturer’s warranty

• 450mm plastic or 600mm x 600mm square galvanised lid

• Optional turrets for deeper installation or control set housing

Potable Models

• WRAS-approved polymer for drinking water contact

• CAT5 compliant options available for mains water connection

• Below-ground drinking water storage — residential, commercial & agricultural

• Back-up & emergency water supply

• Rainwater harvesting — discreet below-ground collection & storage

• Greywater recycling systems

• Irrigation — gardens, sports fields, golf courses & horticulture

Livestock & equestrian water supply

• Industrial & commercial process water storage

• Fire suppression water storage

• Space-saving — no above-ground footprint, preserves surface for other uses

Why Choose OTIS Tanks?

Specialist Knowledge & experience built over 25 Years in Oil Storage for Domestic, Commercial & Defence Customers locally & Nationwide. Compliant Service in line with current guidance and legislation found in HSG, OFTEC, Building regulations, UK Oil Storage Regulations (Eng, Wal, Scot)
Friendly, experienced & knowlegable engineers and a 24/7 Support (Emergency Spill Response Line).

Related Services: Fuel Tank Installation, Tank Removal & Decommission, Contaminated Fuel Oil Disposal
Put your Oil Storage in safe Hands, Contact the OTIS Team today! TEL: 01691 658777

Need Assistance? Get in Touch!

E: enquiries@otistanks.com | P: 01691 658 777

Speak to our oil tank specialists to arrange your free site assessment. Call 01691 658 777 or request a quote