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Concrete Septic Tanks QLD & NSW

Discover Durable & Secure Precast Concrete Products

Septic Tanks Northern Rivers & Surrounds

Having the right septic tank is vitally important to the health of your home. Wastewater systems keep your plumbing system running smoothly and ensure that wastewater is removed from your home in a safe and effective manner.

Graham’s Precast Concrete Products is the leading choice for concrete septic tanks in New South Wales. Proudly Australian-owned and operated, Graham’s Precast Concrete Products has been building and maintaining a flawless reputation for over 40 years. We provide the highest quality tanks and are passionate about exceptional customer service.

At Graham’s, we pride on ourselves on great quality concrete products and even better customer service. We deliver our septic tanks right up to the job site ready for the plumber to hook it up. We’ll even help you install reed beds to provide additional filtration, so you can rest assured that your wastewater is being properly managed. Simply line up the dates with your plumber and we will install the tank when they are there.

For top quality concrete septic tanks, get in touch with our team today. Request a quote online or call us on 02 6632 2978.

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Loading septic tank b large crane — Septic Tanks in Kyogle, NSW

Northern Rivers Wastewater Systems

Having the right septic tank is important to your household’s health. Septic tanks keep plumbing systems running smoothly and ensure that wastewater is removed from your home in a safe and effective manner. Based in Kyogle, Graham’s Precast Concrete Products is the leading choice for concrete septic tanks in the Northern Rivers region—from Lismore, Tweed heads and Grafton to Yamba, Coffs Coast and Byron Bay. Proudly Australian-owned and operated, we’ve been building and maintaining a flawless reputation for over 40 years!

At Graham’s, we pride ourselves on great quality concrete products and even better customer service. We deliver our septic tanks right up to the jobsite, ready for the plumber to hook them up. We’ll even help you install reed beds to provide additional filtration, so you can rest assured that your wastewater is properly managed.

Simply line up the dates with your plumber, and we’ll install the tank when they’re available. For reliable septic tanks, get in touch with our team today. You can request a free, no-obligation quote online or call (02) 6632 2978.

The Benefits Of A Concrete Septic Tank

We all know how durable concrete is, but did you also know that it’s incredibly eco-friendly? Over its lifetime, a concrete structure has the lowest carbon footprint when compared to other materials. Concrete is good for the earth and great for your pocket. The initial cost, as well as the ongoing maintenance costs, are incredibly affordable. 

Compared to plastic septic tanks, concrete tanks have a range of advantages that make them your ideal wastewater solution. Concrete tanks are rigid and watertight, reducing the risk of leaks over the years. Moreover, with quality concrete, your tank can last a lifetime.

Other benefits include:

To learn more about the benefits of concrete septic tanks, head on to our latest blog. To book a septic tank installation, contact us today!

How Does A Concrete Septic Tank Work?

We believe that understanding how a septic works can lead to better maintenance and understanding of our products. A septic tank is buried underground and collects liquid waste that flows from your home. This wastewater is a result of kitchen, bathroom, toilet, and laundry usage. The main function of a septic tank is to separate grease, solids, and oils from wastewater. This means that wastewater is clear of any obtrusions before entering drainage systems.

As wastewater enters a septic tank, heavier solids will sink to the bottom and begin the process known as bacterial digestion. As these elements decompose, they turn into sludge that sits at the bottom of the septic tank. Solids are separated from other elements, such as grease and oil, as they float to the surface of the tank instead. Grease and oil then form a hard crust over the wastewater. The wastewater is then digested by ‘good bacteria’ and turns into effluent, another name for wastewater that has undergone separation and digestion. 

Effluent is then carried through to absorption trenches, away from your home, where natural treatment processes will begin. The remaining sludge is sealed in by the crust formed by grease and oils, known as a scum blanket, to help with bacterial breakdown. Over time, there will be too much sludge and it will need to be pumped out and disposed of efficiently. 

Septic tanks are highly economical and are easier on the environment. Once you installed septic tanks, they need to be looked after. They require proper use, care, and maintenance to ensure that they function as they should. Avoid these common mistakes to keep your septic tanks in shape. We are also known for our quality concrete troughswater troughs, concrete feed troughs and cattle gridsContact Graham’s Precast Concrete Products to find out more information.

Wide Range Of Septic Tanks

Frequently Asked Questions

A septic tank, at its most basic level, is a concrete cube that holds wastewater from your plumbing system. Solid materials eventually float to the bottom to create sludge, while floatable matter like oils float to the top as scum. Wastewater is slowly released from the septic tank into a drain field where it is filtered through soil, sand, and other organic matter to naturally neutralise and purify it before it is released into the groundwater.

Choosing a quality, well-built septic tank is highly important. If your tank becomes damaged, it could lead to plumbing backups or even sewage leaking into your yard. You should also ensure that your tank is large enough to accommodate your home. The size you choose will largely depend on the number of bathrooms and how many people inhabit the home.

You should have your concrete septic tank de-sludged regularly to avoid clogging the soil surrounding the drainage system. Other maintenance efforts may include understanding what substances can’t be poured down your drains and making your property more water efficient.

There are several signs that indicate your concrete septic tank is failing, including:

  • Showers & sinks draining slowly
  • Bad odours surrounding the septic tank
  • Backflowing toilet water & sewage
  • Strange sounds coming from plumbing systems


If you believe your septic tank to be in failure, you must contact us as soon as possible.

Concrete septic tanks do naturally smell, yet less so than plastic septic tanks. However, the smell is often stronger where excess detergent or chemicals are being used in your home.

How long it will take until your septic tank needs de-sludging varies between households. By normal standards, we recommend getting your septic tank pumped out every 8 years for a two-person household, or every 4 years for a four-person household.

Concrete septic tanks have a long lifespan which means they’re more durable when compared to plastic septic tanks. They are also heavy which means that they will not float above water level. Concrete septic tanks are also rustproof.

Concrete septic tanks are relatively expensive when compared to other options. The installation process is more complex as large equipment is needed to transport it, which can incur further costs. The material is hard to repair when damaged, meaning that full replacement often needs to happen.

  1. Better durability: Our septic tanks are made in a single pour, meaning better durability and fewer opportunities for leakages.
  2. High-quality concrete tank production: The concrete is precast off-site in a mould. The mould is reinforced with wire and prestressed cable for a robust finish. After the concrete has cured, we then deliver it to you. Our unique curing methods aren’t dependent on the weather. Production never slows down, making Graham’s the most reliable manufacturer in the game.
  3. Optional plumbing & electrical features: The single pour moulds are highly adaptable and customisable. We can include plumbing and electrical features, and the finishing options are totally up to you. All the tanks are flood and fire-resistant, so they’re suitable for any extreme outback conditions.
  4. Compliant products: All Graham’s septic tanks are manufactured to Australian Standards to ensure they are of the highest quality. Our septic tanks are crafted using Australian & NZ standards (1546.1.2 2008 Part 1) for on-domestic wastewater treatment units. You can be sure they’re designed and constructed using the highest standards for safety and effectiveness.
  5. Delivery & installation included: We’ll deliver the septic tank to your location and install it as part of our service. Our team will lower the tanks into a pre-dug hole, and then you can call a plumber to connect it.
  6. We are accredited & certified: As professional and reliable producers of quality concrete water and septic tanks, we hold accreditation for the manufacture of Sewage Management Facility Septic Tanks & Collection Wells, certified by the NSW Department of Health. This includes tank sizes of 2050L, 2300L, 3000L, 3100L, 5000L, and collection wells of 2050L, 2300L, 3000L, 3350L, 5300L, and 7000L.