How Does a Cesspit Work?

Diagram Showing a Cesspit/Cesspool

A Cesspit is a sealed, watertight underground tank that captures wastewater and sewage and simply collects it, without processing or treating it at all.

Depending on the size of the tank, the property and the number of occupants, the cesspit can fill up quickly and needs to be emptied regularly, at monthly, quarterly or annual intervals as required. The Cesspit will usually be discreetly buried underground with a single manhole cover for access by the waste collection team.

Cesspits are designed to be easy to use and trouble–free, but CSG has tips for Cesspit owners, including:

  • Empty the system regularly
  • Don’t let flammable or hazardous liquids to enter the system
  • Don’t allow the area around the manhole cover to become overgrown or obscured


CSG has been supporting households with Cesspits for over 80 years and carrying out annual health checks to keep systems in perfect working order.

We offer a fast, friendly and efficient service for customers who depend on our Cesspit emptying service, help with a blocked system or simply need advice from the experts in domestic sewage collection. Our operatives are all highly experienced and we’re also fully licensed by the Environment Agency to give you complete peace of mind.

For further information or to talk to us about your Cesspit requirements with no obligation, please phone 0800 011 6600 or contact us.