Concrete Septic Tanks in Coffs Harbour
Built to Withstand Harsh Conditions
Custom Precast Solutions Available
Fast Delivery Across NSW & QLD
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Coffs Harbour Concrete Septic Tanks
40
Years
Experience.
If you’re building or upgrading in Coffs Harbour, having the right septic system is essential. At Graham’s Precast Concrete Products, we design and supply concrete septic tanks that withstand coastal conditions.
For more than 40 years, we’ve supported farms, family homes and local developments across NSW and QLD with watertight, precast systems made to Australian Standards.
Our tanks are delivered by crane truck, making installation quick and hassle-free with no delays from onsite pouring. Coffs Harbour property owners choose us because our systems perform reliably in sandy soils, changing weather and the demands of a growing community. From a single home to a large-scale subdivision, we’ll match you with a durable septic solution that’s built to last.
At Graham’s Precast, we make it simple to get the system you need. Call (02) 6632 2978 today for a free quote or to discuss septic tanks in Coffs Harbour.
Supporting civil projects across NSW & QLD.
40
Septic Systems for Coastal Living
Properties in Coffs Harbour need septic systems that can handle both growth and the challenges of the coastal environment. Our precast tanks are reinforced for strength and arrive ready to install, saving time and ensuring long-term reliability. By removing the need for onsite formwork, we keep projects efficient and stress-free.
Every septic tank we manufacture meets national standards and is carefully tested before delivery. For eco-conscious builds, we also supply reed beds, giving property owners a greener way to manage wastewater while meeting council expectations.
Our crane trucks deliver tanks directly to your site and position them precisely, even on tricky terrain. Coffs Harbour property owners appreciate our straightforward advice, quality products, and dependable service. From your first quote to final installation, we ensure your system is delivered smoothly and set up to perform.
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Septic Tanks Built for Coffs Harbour
Coffs Harbour properties demand septic systems that are tough, compliant and easy to maintain. Graham’s Precast delivers on all three.
- Precast, watertight & fully compliant with Australian Standards
- Reinforced design for coastal soils & weather conditions
- Crane delivery for quick & precise installation
- Long-lasting, low-maintenance performance
- Reed bed options for sustainable wastewater treatment
- Backed by over 40 years of industry expertise

We’re proud to support Coffs Harbour’s growing community with septic tanks that last. With Graham’s Precast, you’ll always get quality products, local knowledge and a team you can rely on.
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Concrete Water Troughs
If you’re looking for a feed trough that can handle a few kicks from pushy livestock, our precast concrete option is ideal. This product is safe, stable, and long-lasting.
Civil Construction Products
Septic Tank Installation
We provide septic tank installation in Coffs Harbour that’s quick, reliable and hassle-free. Our precast tanks arrive ready to go, with crane delivery ensuring smooth placement and long-term performance.
Concrete Cattle Grids
Our concrete cattle grids in Coffs Harbour are designed for strength and endurance. They’re ideal for rural properties, giving landowners a reliable way to control stock while keeping access open.
Civil Construction Products
We supply Coffs Harbour with precast civil products engineered for tough conditions. From stormwater pits to headwalls, our solutions help local contractors deliver infrastructure that’s built strong and built to last.
How long does a concrete septic tank last?
A well-built concrete septic tank can last 40 years or more when properly installed and maintained. Their strength and durability make them ideal for coastal and regional areas like Coffs Harbour, where soil and weather conditions can be demanding. Regular inspections, pumping every 3–5 years, and avoiding flushing harmful chemicals will help extend the life of the tank and keep the system running efficiently.
Are concrete septic tanks better than plastic ones?
Concrete septic tanks are often considered more durable than plastic tanks, particularly in areas with heavy soils, high groundwater, or the risk of flooding. Unlike plastic tanks, concrete models resist buoyancy and shifting underground. They also offer greater resistance to fire and UV exposure. While plastic tanks can be lighter and easier to transport, concrete systems are generally preferred for long-term reliability and compliance with Australian Standards.
Do concrete septic tanks smell?
When operating correctly, concrete septic tanks should not emit strong odours. A properly functioning system contains natural bacteria that break down waste effectively. Odours may occur if the tank is overdue for pumping, the venting system is blocked, or if inappropriate materials (like grease or chemicals) are flushed. Regular maintenance and mindful use help keep septic systems in Coffs Harbour properties odour-free and efficient.
