Comparing Plastic and Concrete Septic Tanks

If you are considering buying a domestic septic tank then our rotomoulded products are up to the task.


We offer a smaller 1,500-litre pump out chamber, as well as more heavy duty 3,000-litre and 6,000-litre septic tanks. All our domestic underground septic tanks are proven performers and manufactured in strong yet durable polyethylene plastic which is 100% recyclable. Still not convinced plastic is best for you? We compare how our septic tanks measure up to concrete models.

Concrete Septic Tanks

Concrete as a material does have a durable quality if you’re looking at using it as a septic tank. Concrete septic tanks can last for several decades but they are susceptible to cracks early on if the concrete itself is not high quality, or later on if the tank hasn’t been maintained properly. Cracks in the concrete means that waste can leak out or allow groundwater in. Neither scenario is ideal and can cause big problems that aren’t an easy fix. Also concrete is a heavy material so a tank made of it is not that easy to install and it is also much more expensive than plastic.

Plastic Septic Tanks

Plastic tanks on the other hand are very resistant to cracking and generally remain watertight throughout their lifespan. Plastic is a much lighter material than concrete making transport to the location and installation of the septic tank a breeze. As it is a lighter material, care does need to be taken that it isn’t damaged during installation and it should be inspected regularly for low effluence, to make sure everything is working normally. In general, a plastic septic tank is more cost-effective and more hygienic than a concrete septic tank.


If plastic sounds like it’s a winner, check out Global’s rotomoulded domestic septic tanks on offer and give us a call on 1800 666 333 to discuss your requirements.

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