Paxton CT1000JB Underground Water Storage Tank – 4,546 Litres

The Paxton CT1000JB is a below-ground potable water storage tank with a 4,546-litre capacity, manufactured from UV-stabilised MDPE using 100% food-grade materials throughout. WRAS approved and designed for drinking water storage for human consumption, it is also well suited to rainwater harvesting, agricultural water supply, and bulk water storage applications. The hard-wearing one-piece stress-free moulding will not rust, rot, or corrode below ground, and is frost resistant to -40°C for dependable long-term underground performance.

Key Features

• Capacity: 4,546 litres
• Approval: WRAS approved – suitable for potable water storage
• Material: 100% food-grade UV-stabilised MDPE throughout
• Construction: Hard-wearing one-piece stress-free moulding
• Frost Resistance: To -40°C – will not rust, rot, or corrode
• Interior: Smooth, hygienic surfaces
• Installation: Built-in lifting lugs for safe below-ground placement
• Access: Large screw-in lid for inspection and maintenance
• Connections: Flat area for outlets and fittings; optional 2" outlet available
• Compliance Kit: Byelaw 30 kit included (screened overflow, screened vent, standard vent plug)

Technical Specifications

• Capacity: 4,546 litres
• Manhole Internal: 546mm
• Vented Insert Internal: 127mm
• Material: UV-stabilised medium-density moulded polyethylene (MDPE) – 100% food grade
• Approval: WRAS approved

Applications and Usage

The Paxton CT1000JB is a high-performance underground water storage solution suited to a wide range of residential, rural, and commercial applications. Its 4,546-litre capacity makes it a practical mid-range option for farms, smallholdings, and rural properties requiring a reliable mains or rainwater buffer tank installed discreetly below ground. WRAS approval confirms suitability for potable water contact, making it equally appropriate for drinking water storage and grey-water or harvested rainwater applications. The one-piece MDPE moulding eliminates internal joints, reducing contamination risk and ensuring long-term structural reliability in permanently buried installations. Built-in lifting lugs support safe, controlled lowering into the excavation using standard plant, and the flat area around the tank body simplifies the attachment of pipework and fittings on site. The smooth internal surfaces are easy to inspect and help maintain water hygiene over the tank's service life. The Byelaw 30 compliance kit — including screened overflow, screened vent, and standard vent plug — is included as standard to support compliant UK potable water installations.

Learn more about Paxton Agricultural products here.