Skip to content
FREE OR SUBSIDISED SHIPPING FOR ORDERS OVER $400*
FREE OR SUBSIDISED SHIPPING FOR ORDERS OVER $400*

Filters

Septic Tanks

  • Sale

    3,100 Litre Polymaster Septic Tank

    Polymaster
    $2,700.00
    $2,490.00

    Information   This heavy-duty Poly Septic tank is ideally suited to a household of 1-5 people. Measuring 2450 x 1640 x 1665 with a capacity of 3100...

    View full details
    $2,700.00
    $2,490.00
    Sale

Septic Tanks for Rural, Residential & Commercial Properties

Choose from high‑quality Polymaster and Rapid Plas septic tanks designed for Australian conditions. Our range includes durable poly septic tanks, pump‑out chambers, risers, lids and wastewater components built for long‑term reliability and compliance.

Why Choose a Poly Septic Tank?

Polymer septic tanks from Polymaster and Rapid Plas are engineered for strength, corrosion resistance and easy installation. Unlike concrete tanks, poly tanks are lightweight, impact‑resistant and ideal for remote or difficult‑access sites. They’re fully compliant with Australian Standards and suitable for new builds, upgrades and system replacements.

Septic Tanks We Supply

Polymaster Septic Tanks

Polymaster tanks are known for their structural integrity and long service life. They feature:

  • One‑piece rotational moulding
  • High‑strength ribbing
  • Easy‑access inspection points
  • Lightweight design for fast installation

Rapid Plas Septic Tanks

Rapid Plas tanks are built for rural and residential wastewater systems. Key features include:

  • UV‑stabilised polyethylene
  • Reinforced walls for ground pressure
  • Smooth internal surfaces for efficient flow
  • Compatible risers and lids

What Size Septic Tank Do You Need?

Choosing the right size depends on:

  • Number of bedrooms
  • Expected daily wastewater load
  • Council requirements
  • Soil type and drainage field design

Common sizes include:

  • 2,800L septic tanks
  • 3,100L septic tanks
  • 4,550L septic tanks

If you’re unsure, your plumber or council guidelines will specify the minimum capacity required.

Septic System Components We Stock

  • Poly Septic Tanks
  • Poly Risers 
  • Sewer & Black Water Pump Stations 
  • Grey Water Pump Stations

Installation & Compliance

All septic tanks we supply meet Australian Standards and are suitable for council‑approved installations. Always check:

  • Local council wastewater requirements
  • Setback distances
  • Soil percolation test results
  • Drainage field design

Your licensed plumber or wastewater designer will confirm the correct placement and installation method.  Please note you will need to arrange your own lifting equipment for the delivery.

Why Buy Your Septic Tank From Ag Superstore?

  • We only stock trusted Septic Tank brands backed by warranties
  • Expert Support  for choosing the right system
  • We deliver all over Australia with subsidised freight

For a yarn or more information on Septic Tanks, either give the team at Ag Superstore a call on 1300 326 453 or email help@agsuperstore.com.au and we will find what you're looking for.

Frequenty Asked Questions about Septic Tanks

What size septic tank do I need?

Most homes require a 2,800L–5,000L tank depending on bedrooms and council rules.

Are poly septic tanks better than concrete?

Poly tanks are lighter, corrosion‑proof and easier to install, while still meeting Australian Standards.

How long does a septic tank last?

A quality poly septic tank can last 20–40 years with proper maintenance.

Do septic tanks need council approval?

Yes, all new installations and replacements require council approval and a licensed installer.

Do you deliver septic tanks?

Yes we do.  You will just need to arrange the appropriate lifting equipment on-site.