Greenbar Excavation

Types Of Septic Tanks: Plastic Vs. Concrete 

Types Of Septic Tanks

Septic tanks give the same benefits but the types of septic tanks there are is night and day. You’ve probably seen concrete and plastic septic tanks, regardless of whether you’re looking to install a new septic system or replace an existing one.

Many homeowners don’t like the idea of spending large amounts of money on something that manages wastewater. This is a major investment that should not be taken lightly. Each has its pros and cons, and we hope this helps you make a decision on the types of septic tanks you would want to install.

Plastic Septic Tanks

These types of septic tanks are becoming an increasingly popular alternative to concrete tanks. They come pre-made in an oval shape and have ridges on the exterior walls.


  • Easy to Install and Lighter

These types of septic tanks are lightweight because they are made from plastic. They typically weigh in at least 100 pounds and can easily be moved with a regular truck. It is therefore much easier to install and less expensive. It is as easy as digging a hole, placing the tank, and connecting it with the rest of the system.

  • Cheaper

Plastic septic tanks can be lighter and more straightforward to install than concrete tanks. These savings are usually the greatest in terms of installation costs, but they can also be used to save money on the tank.


  • Weaker

Concrete septic tanks can be stronger than plastic ones. Driving anything on top of the tank could cause it to crack or be damaged. Plastic septic tanks can also be damaged by environmental factors like soil vibrations or root penetration, which could cause cracks or warping. This damage can sometimes be repaired, but depending on the severity of the problem, it may be necessary to replace the tank.

  • Low Effluent Levels

To function properly, septic tanks must have the right balance of sludge/solids, effluent/water, and scum/lightweight solids. The plastic septic tank is lighter and can’t handle as much effluent as a concrete one. It can cause flooding in your system, causing the tank to “float” on the soil. This could damage the plumbing lines around the tank.

  • Require More Maintenance

Plastic septic tanks are less able to handle high levels of effluent than concrete tanks and require more regular maintenance. To prevent the buildup of effluent, you will need to clean them more often. This is an important aspect to consider when calculating the total cost of each system.

Concrete Septic Tanks

Concrete septic tanks offer a traditional alternative. There are two options: have a pre-cast concrete tank delivered to you, or have it poured in your place. Premade tanks can be installed immediately after they arrive. For the poured-in-place option, you will need to dig a hole and create a mold in order to form your tank.


  • Durable

Concrete septic tanks last longer than plastic ones. Concrete septic tanks can be easily driven over. This is not true for the lines that lead to or from the tank. Be careful.

  • Low Maintenance/High Effluence

Concrete septic tanks can handle large amounts of effluent because they are very heavy. Concrete septic tanks require less maintenance than plastic.


  • Heavy/Expensive

Concrete septic tanks are heavy. They can weigh up to several tons, depending on the size of your home. These heavyweights require heavy machinery to transport and install. This will result in higher overall costs.

  • More difficult to repair

Concrete septic tanks are less susceptible to being damaged by environmental factors like soil vibrations and root penetration. If they are damaged or cracked, however, it can take longer to repair the tank over plastic tanks.

Contact Greenbar Excavation if you aren’t sure which types of septic tanks are best for your home. There are many factors that will impact your decision on the right system. We are happy to talk with you about the different options, their pros and cons, and what they mean.

Greenbar Excavation has been providing quality excavation services to central Oregon for over ten years. We understand the importance of knowing your project. Greenbar Excavation is a fully licensed, insured, and accredited Excavation company based in Prineville, Oregon. Greenbar Excavation is one of the top Excavation companies in Central Oregon. Don’t look any further, go with the company with your best interest in mind! We offer a multitude of services which include:

Call us today with any questions about the types of septic tanks you can get installed and check out our 5-star reviews!