Deciding between a concrete vs plastic septic tank can impact cost, upkeep, and longevity. Whether you’re leaning toward a plastic or concrete septic tank, it helps to weigh benefits like installation ease, durability, and local conditions. In this guide, we explore plastic vs cement septic tank differences and answer key questions like “Are plastic septic tanks good?” to help you choose confidently.
Overview: What Does “Concrete vs Plastic Septic Tank” Mean?
Septic tanks can be made from concrete or plastic (polyethylene), each offering unique benefits.
- A concrete septic tank is heavy and robust. It resists shifting and lasts for decades. It’s ideal for wet soils or drive-over areas.
- A plastic septic tank, often high-density polyethylene, is lightweight, corrosion-resistant, and easier to install.
- Choosing between a plastic and concrete septic tank depends on your site conditions, budget, and installation needs.
Selecting the right material, whether comparing plastic vs cement septic tank options or deciding if plastic septic tanks are good for your property, ensures long-term system performance.

Material Comparison: Advantages and Drawbacks
Plastic Septic Tanks
- Lightweight and easy to transport and install, ideal for quick setups.
- Generally more affordable and corrosion-resistant compared to concrete.
- Flexible and less prone to cracking, but may float in high groundwater or deform under heavy weight.
Concrete Septic Tanks
- Extremely durable, often lasting 40+ years with proper maintenance.
- Heavy and stable resists floating and soil shifting.
- Requires heavy equipment and higher installation costs.
- Prone to cracking over time if exposed to freeze-thaw cycles or acidic soils.
Plastic or Concrete Septic Tank: How to Choose
Budget & Installation Constraints
- A plastic septic tank is typically more affordable and faster to install, making it ideal for budget-conscious homeowners.
- Its lightweight design reduces labor costs and allows installation in areas with limited access for large equipment.
- A concrete septic tank costs more upfront and requires heavy machinery due to its weight, but the installation often results in a more stable long-term setup.
Environmental & Soil Considerations
- In areas with high groundwater levels, a concrete septic tank is less likely to float or shift, which can protect against costly repairs.
- Plastic septic tanks are recyclable, easier to relocate, and may offer a lower environmental footprint when compared to plastic vs cement septic tank manufacturing impacts.
Maintenance & Durability
- Concrete septic tanks require less frequent maintenance but may crack over decades due to freeze thaw cycles or soil movement.
- Plastic septic tanks are immune to rust and chemical corrosion but may need more regular monitoring for warping or structural shifts.
Are Plastic Septic Tanks Good?
- Many homeowners and industry experts agree: plastic septic tanks can outperform concrete in certain environments.
- When comparing concrete vs plastic septic tank options, the choice depends on soil conditions, budget, and maintenance commitment.

Conclusion
Choosing between a concrete vs plastic septic tank depends on soil, budget, and upkeep. Plastic septic tanks are affordable, lightweight, and resist corrosion, while concrete septic tanks offer unmatched durability and stability. Whether you opt for plastic or concrete septic tank, proper installation and maintenance ensure long service life. If you’re wondering, “Are plastic septic tanks good?” yes, especially for cost-conscious projects, while plastic vs cement septic tank comparisons show concrete suits high-water-table areas best.
From urgent repairs to routine maintenance, trust Advanced Septic Services, reach us anytime at 780-691-0588 or online at AdvancedSepticServices.ca
Quick FAQs
1. What are the disadvantages of a concrete septic tank?
Concrete septic tanks can crack over time, are heavier to install, and cost more than plastic alternatives in the concrete vs plastic septic tank debate.
2. What is the best material for a septic tank?
The best material depends on soil, budget, and maintenance needs—plastic offers affordability, while concrete delivers long-term stability and durability.
3. Which is best, a cement tank or a plastic tank?
In the plastic vs cement septic tank comparison, cement tanks resist floating in high water tables, while plastic tanks are easier to install and maintain.
4. Is it better to have a concrete or plastic septic tank?
Concrete septic tanks suit properties with shifting soil or high groundwater. Plastic tanks are better for quick installs and lower upfront costs.
5. How long will a plastic septic tank last?
When properly maintained, a plastic septic tank can last 30–40 years, often matching or exceeding some concrete tank lifespans.