Cesspools
A cesspool (also known as a cesspit) is a sealed underground storage tank designed to collect and store sewage and wastewater where discharge to a drainage field or watercourse is not possible. Unlike septic tanks or sewage treatment plants, a cesspool does not treat wastewater and must be emptied regularly by a licensed waste carrier.
Manufactured in the UK from high-quality rotationally moulded polyethylene, our cesspools are built for strength, durability and long service life. Their robust ribbed construction allows, in many standard installations, the use of environmentally friendly pea gravel backfill, helping to reduce installation costs while providing a reliable wastewater storage solution for domestic, agricultural and commercial applications.
Whether you’re installing a cesspool for a new development or replacing an existing system, our range is designed to provide dependable underground sewage storage where no other drainage option is available.
What is the difference between a cesspool and a septic tank?
The main difference is that a cesspool stores wastewater, whereas a septic tank treats it before discharging partially treated effluent to a drainage field.
A cesspool is completely sealed and has no outlet, so all wastewater remains inside the tank until it is emptied. Septic tanks require suitable ground conditions and drainage fields, whereas cesspools are typically installed where these are not possible.
When is a cesspool the right solution?
A cesspool is often the best option where there is no mains drainage and a septic tank or sewage treatment plant cannot be installed due to poor ground conditions, limited space or planning restrictions. They are also commonly used for temporary buildings, remote locations and certain commercial applications.
How often does a cesspool need emptying?
The frequency depends on the size of the tank and how much wastewater is produced. Properties with higher occupancy or smaller tanks will generally require more frequent emptying. Because a cesspool is a sealed storage tank, regular emptying is essential to prevent it becoming full.
What size cesspool do I need?
The correct size depends on the number of users, daily wastewater usage and how frequently you intend to have the tank emptied. Choosing the right capacity can help reduce emptying costs and improve the overall efficiency of the system. If you're unsure which size is suitable, our team can help you select the most appropriate option.
Can a cesspool be installed in areas with a high water table?
Many modern polyethylene cesspools feature a shallow dig design, making them suitable for a wide range of installation conditions, including areas with higher groundwater levels. Installation requirements can vary depending on the site, so it's always important to follow the manufacturer's installation instructions or seek professional advice before installation.
How long does a plastic cesspool last?
A high-quality rotationally moulded polyethylene cesspool is designed to provide many years of reliable service. Unlike traditional steel or concrete tanks, polyethylene will not rust or corrode and requires very little maintenance when correctly installed and maintained.
Can a cesspool store chemical toilet waste?
Yes. Many of our underground cesspools are suitable for storing ELSAN chemical toilet waste, as well as sewage, foul water and many of the chemicals commonly used in toilet treatment systems. Always check the individual product specification to confirm compatibility.
Do cesspools require planning permission?
Planning and Building Regulations requirements vary depending on the property, location and type of installation. Before installing a cesspool, you should check the current regulations and obtain any approvals that may be required.
Why buy your cesspool from Online Tank Store?
At Online Tank Store, we supply high-quality UK manufactured cesspools designed for long-term reliability and straightforward installation. Our experienced team can help you choose the right size for your project, answer any technical questions and provide expert advice before and after your purchase. With nationwide delivery and trusted products from leading UK manufacturers, we're committed to helping you find the right wastewater storage solution.