Septic Tanks

Septic Tanks For Sale 

A septic tank is typically installed underground and is commonly made from precast concrete, fibreglass, or plastic.

Concrete septic tanks are known for their durability and strength, making them a long-lasting solution, while fibreglass septic tanks offer a lightweight, rust-resistant alternative. Plastic septic tanks are another popular choice due to their affordability, ease of installation, and resistance to cracking.

These tanks effectively manage sewage by treating wastewater and storing solid waste. When mains drainage isn’t available, a septic tank connected to a soakaway system provides a reliable wastewater solution. All of our septic tanks meet the required regulations and are manufactured with longevity in mind. Our septic tank systems follow water quality codes of practice with well-known brands like Clearwater, Klargester, GRAF and Tricel in the range.

We also have supporting products, like sewage treatment plans, to help you dispose of your wastewater.

If your home or business uses a septic tank, you’ll need to register with the Environmental Agency. You’re also solely responsible for maintaining it. But we have advice across our site and the team are on hand to help with your specifications.

Take a look at our full range of UK septic tanks below.

Septic Tank FAQs

How Do Septic Tanks Work?

Waste enters the tank via the inlet pipe. The heaviest components sink to the bottom, while the lightest float. The effluent is between these two layers. As more liquid enters the tank, it’ll be pushed through the outlet into a closed network of perforated pipes. After this, the effluent’s filtered through the bed and into the soil below. For more information, please see our article detailing how septic tanks work. 

How Often Does a Septic Tank Have to be Emptied​?

To keep your septic tank functioning properly and avoid costly repairs, it’s essential to have it emptied regularly. On average, we recommend that you empty your septic tank every 6 to 12 months. However, the frequency will depend on several factors, such as:

- Size of the septic tank: Smaller tanks will need to be emptied more frequently than larger ones.

- Number of users: More people using the septic system means more waste, and thus, more frequent emptying.

- What’s being flushed: Avoiding non-biodegradable materials, grease, or harsh chemicals can help extend the time between emptying sessions.

Failing to empty your septic tank regularly can result in a build-up of sludge, which can cause blockages, unpleasant smells, and even complete system failure. These issues can be difficult and expensive to fix, so it's always better to be proactive. It’s also important to be aware of the signs that your septic tank may be full, which we discuss below. 

Where Should I Put My Septic Tank?

Your septic tank should be somewhere fairly flat and with little risk of flooding. We don’t advise siting them or placing your septic tank near steep inclines, tree roots, utility lines or other plumbing. They also need to be at least seven feet away from any property. 

Is There a List of Things Not to Put in a Septic Tank?

Nothing other than bodily fluids should be put into a septic tank system. This includes avoiding items like nappies, cigarettes, cat litter, and plastic, as well as oils, rainwater, and chemicals or paint. These materials can easily block the system, cause damage, or lead to a faster build-up of sludge, resulting in costly repairs.

How Can You Tell if Your Septic Tank is Full​?

Recognising the signs that your septic tank is full and needs emptying is key to maintaining the health of your system and avoiding costly damage. Some common indicators that your septic tank is reaching capacity include:

- Slow Drainage: If you notice that sinks, showers, and toilets are draining slower than usual, it could be a sign that the septic tank is full. This happens because the tank is unable to process wastewater effectively as it nears capacity.

- Gurgling Sounds: Gurgling noises coming from your pipes are another telltale sign. This often occurs when air is trapped in the plumbing due to blockages or slow drainage caused by a full tank.

- Odours: A strong, foul smell around the property or near the soakaway area is a clear indicator that the septic tank is full. If the tank is overloaded, it can lead to untreated waste and unpleasant odors spreading outside.

- Standing Water or Wet Spots: Look out for standing water or soggy patches, particularly near the septic tank or drain field. This can occur when the system is struggling to handle the wastewater, causing effluent to pool on the surface.

- Flies and Midges: An unusual increase in flies or midges around the septic tank or soakaway area can also be a sign that the system is reaching capacity.

If you notice any of these signs, it’s important to have your septic tank emptied promptly to avoid backup issues and further damage to the system.

How Long Can a Septic Tank Last​?

Septic tanks, when properly maintained, can last anywhere from 20 to 40 years, and in some cases, even longer. The lifespan of your septic tank depends on factors such as construction quality, maintenance, and environmental conditions. A well-constructed tank can provide decades of service, making it a valuable investment for your property.

To maximise the lifespan of your septic tank, regular inspections and emptying are essential. Routine maintenance helps remove accumulated sludge and scum, preventing clogs that can cause long-term damage to the system. Neglecting maintenance tasks, such as failing to pump the tank or ignoring early warning signs of issues, can shorten the tank’s life, leading to costly repairs or premature replacement.

Additionally, factors like the type of soil, climate, and weather conditions in your area may influence how quickly your septic tank fills up or deteriorates. For example, dense clay soils may slow drainage, and extreme weather can impact the tank's structure.

Do Septic Systems Need to Be Serviced?

Yes, it's best to have your septic tank serviced and emptied every 3 to 5 years, depending on usage. However, it's important to follow the manufacturer's guidance for maintenance. Regular assessments are crucial to identify potential issues early and avoid costly repairs. A typical service involves pumping out the tank’s contents, but additional checks may be necessary to ensure proper functioning.

Do Septic Tanks Need a Permit?

You’ll need planning permission from your local council to install a septic tank. Failing to get it could mean a fine of £150,000 heading your way.

What Are the 2 Shapes of Septic Tank?

There are two main shapes of septic tanks: onion-shaped tanks and shallow dig tanks.

Onion-Shaped Septic Tanks: These fibreglass tanks, named for their shape, have three chambers for wastewater treatment. Solids settle in the first chamber, while bacteria break down organic material. The liquid flows through the second and third chambers for further separation before reaching the soakaway system. Due to their design, they often require concreting in after installation.

Shallow Dig Septic Tanks: These tanks are typically used when a smaller hole can be dug. They are easier and quicker to install than onion-shaped tanks and are often used in areas where digging depth is limited. Shallow dig tanks function similarly to onion-shaped tanks, but their installation is simpler and does not require the same level of structural support.

What is The Difference Between a Septic Tank and a Cesspool?

A septic tank is an underground chamber designed to treat wastewater by separating solids and allowing liquid waste to be filtered into the soil. It generally includes a filtration system to treat effluent before it is released. In contrast, a cesspool is a large underground container that collects wastewater but doesn’t treat it. Instead, the waste is stored until it needs to be emptied.

When deciding between the two, consider your property's location, size, and waste management needs. If your property is in an area where the soil can adequately filter and absorb wastewater, a septic tank may be the best choice. It offers long-term benefits with lower environmental impact. However, if you have limited space, a cesspool may be an easier option, though it will require more frequent maintenance and emptying

What Are The Reasons for Reguarly Maintaining a Septic Tank?

Proper care and maintenance of your septic tank system are essential for ensuring it functions efficiently and prevents costly repairs. Regular septic tank maintenance helps to:

- Prevent blockages and backups by ensuring solids don't build up and overwhelm the system.

- Avoid environmental damage by ensuring wastewater is properly treated before being released into the ground or surface water.

- Extend the life of the system, saving you money on early replacements or expensive repairs.

- Ensure legal compliance with environmental regulations, avoiding potential fines for non-compliant systems.

Septic Tank Registration: Is It Required?

Yes, if your septic tank discharges wastewater into a watercourse (e.g., a river, stream, or ditch), you are required to register it with the Environment Agency under the Septic Tank General Binding Rules. This registration ensures that your system complies with environmental regulations and is properly maintained.

How Can I Ensure My Septic Tank Meets Regulations?

To comply with septic tank regulations, you have three main options:

- Upgrade to a sewage treatment plant if discharging into a watercourse.

- Connect to the mains sewer if available.

- Install a drainage field or soakaway to safely discharge effluent.

Make sure your system meets the latest environmental standards to avoid penalties.

How Far Does a Septic Tank Need to Be from My House​?

The ideal distance between your septic tank and the house is typically at least 10 feet. However, the exact distance may vary depending on local regulations, the size of the property, and soil conditions. It’s essential to ensure that the tank is far enough to allow for proper drainage and access for maintenance.

Always check with local authorities or a professional to ensure your septic tank is installed at a compliant and effective distance.