What is a cesspit?

How does a cesspit work?

A cesspit tank is a sealed, waterproof tank buried underground. It merely collects sewage without treating it in any way.

Cesspits only have one single utility hole cover for access by waste collection companies. They are usually either made out of fibreglass or brick. The only pipe is an exhaust, to allow the escape of gas which builds up in the pit as there is no other opening.

Regular emptying is necessary, and a larger tank volume is required compared to a septic tank or sewage treatment plant.

One advantage of a cesspit is its lack of need for an outlet, eliminating the necessity for a drainage field or consideration of wastewater disposal. Instead, everything that enters must be removed by suction.

However, there are several drawbacks to this system:

1. Cesspits do not perform any sewage treatment; you are essentially emptying untreated sewage.
2. Due to the need for frequent emptying, maintenance costs can be quite high. In comparison, a septic tank or sewage treatment plant in the UK only requires emptying once a year.
3. Cesspits require large tanks to accommodate the substantial volume of wastewater.

Nonetheless, cesspits might be the preferred choice in specific and rare circumstances, such as:

• A village hall with infrequent usage
• A shepherd’s hut with no viable discharge option
• A holiday home that is very rarely occupied

For more information on selecting between a cesspit and a septic tank, further reading is available.

How much does a cesspit cost?

You are required to keep your cesspit in good condition: you have to empty it, clean it and fix any leaks.

Nonetheless, with a cesspit, you are not obliged to pay waste disposal bills to the local water authority.

How to maintain a cesspit?

Cesspits require regular and frequent emptying by a licensed waste disposal company using vacuum tankers. Many companies offer this service by strictly following the current standards and regulations.

Depending on the size of the tank, the property and the number of occupants, the cesspit can fill up quickly and require regular emptying: either monthly, quarterly or annually.

As previously stated, many companies in the UK can regularly empty your septic tank or cesspit at a competitive price, thus reducing the risk of blocked drains or overflow. These teams of experts are fully equipped to empty septic units of any size, increasing the functionality of the pits and avoiding potential failure.

How to repair a cesspit?

As sewage is untreated inside the cesspit, any leak has to be sealed as soon as possible to avoid contamination. That is why you need to check the levels of your fluids regularly. If you notice a fluid drop, then your tank has a breach.

Once you have spotted a leak, your cesspit would require draining, cleaning and resealing.

If constructed from brick, your cesspit might require rendering, seal it with a waterproof paint or line it again with Glass Reinforced Plastic (GRP). Otherwise if manufactured from GRP, the tank may only require a patch. If it has broken down, you may consider upgrading your unit and replacing it with a septic tank or packaged treatment plant.

To help you make your decision, you can read our article about the differences between cesspits and septic tanks.

If you have any questions about our sewage systems, you can email us or even drop us a message via our contact form. We will be more than happy to help you with your request!