Which Is Better Concrete Or Plastic Septic Tank? (Perfect answer)

Cement Septic tanks are very durable than plastic tanks and, if kept properly, can have extended longevity. With regular draining and proper maintenance, a cement septic tank can last for up to 40 years. Cement septic tanks are resistant to environmental changes such as tree roots or changing soil conditions.

Are concrete septic tanks better than plastic?

  • Concrete tanks are generally more durable and can hold up well in different kinds of environments. On the other hand, plastic tanks are more affordable and they’re also less susceptible to corrosion. It is worth noting though that plastic septic tanks are not allowed everywhere.

How long does plastic septic tank last?

A septic tank can last between 20 and 40 years. The lifespan depends on the tank’s material. A steel tank lasts 20 years, while a concrete tank lasts 40 years. Plastic tanks can last as long as 30 years.

Which is better concrete or fiberglass septic tank?

While concrete is known for its durability, fiberglass septic tanks are even more durable. Once buried, fiberglass tanks become completely inert. Unlike concrete, it won’t degrade, rust, or weaken. Fiberglass septic tanks also require less maintenance than concrete septic tanks do.

What is the life expectancy of a concrete septic tank?

Inspectapedia estimates that a steel tank baffles will rust out in 15 to 20 years and may collapse if driven over, but a concrete tank will last 40 years or more as long as the wastewater is not acidic. It’s important to consider the life expectancy of a drain-field, too.

What kind of septic tank lasts the longest?

Concrete septic tanks have the longest lifespan out of any septic tank material. While they are more expensive and sometimes difficult to install, it is for a good reason. A properly designed and installed concrete septic tank can last for anywhere from 40 years and beyond.

Do plastic septic tanks collapse?

Guide to Plastic or Fiberglass Septic Tanks Fiberglass or Plastic Septic Tanks: are very resistant to some of the problems occurring with concrete (cracks) or steel (rust) septic or home made (collapse) septic tanks.

Do concrete septic tanks leak?

The most common problem with concrete septic tanks is that they crack, which causes leaks and problems with soil contamination. If the leaks are only minor, usually they can be repaired and sealed; allowing you to get more life out of your tank.

How long do fiberglass septic tanks last?

Fiberglass Septic Tank Cost Depending on the construction methods, the condition of the soil, and the materials used while manufacturing, a fiberglass tank can last as long as twenty to thirty years.

What is the cheapest septic tank?

Types of Septic Tank Systems These conventional septic systems are usually the most affordable, with an average cost of around $3,000.

How often should a 1000 gallon septic tank be pumped?

For example, a 1,000 gallon septic tank, which is used by two people, should be pumped every 5.9 years. If there are eight people using a 1,000-gallon septic tank, it should be pumped every year.

Does heavy rain affect septic tank?

It is common to have a septic back up after or even during a heavy rain. Significant rainfall can quickly flood the ground around the soil absorption area (drainfield) leaving it saturated, making it impossible for water to flow out of your septic system.

How can I make my septic tank last longer?

How to Extend the Life of Your Septic System

  1. Do conduct annual inspections.
  2. Do conduct regular tank cleaning.
  3. Do know where your septic system is.
  4. Do keep septic system maintenance records.
  5. Do reduce water load into your septic system.
  6. Do avoid draining other water sources into your leach field.

What will ruin a septic system?

Substances like motor oil, paints, varnishes, and floor wax will damage organisms in your tank. This bacterium is necessary to keep your soil and groundwater free from pathogens. Instead of putting these oils down the drain, refer to your city’s waste management for recommended guidelines to dispose of these chemicals.

How often should a septic tank be replaced?

Typical lifespan is in excess of 30 years for GRP, PE and concrete tanks. Assuming optimal conditions of install and use, you could expect the following: Steel septic tanks have a life expectancy of 15 to 20 years.

What kind of septic tank is best?

The best choice is a precast concrete septic tank. Precast septic tanks hold many advantages over plastic, steel, or fiberglass tanks. This is why so many cities and towns actually require the use of concrete septic tanks.

Concrete vs Plastic Septic Tanks: Which is Better?

The septic tank on your property is one of the most important components of the whole plumbing system on your property. Septic tanks are designed to safely handle and manage all of the wastewater generated by your property. If your septic tank is not operating properly, you should replace or repair it as soon as possible. It is possible that your septic tank is not operating properly, causing your entire plumbing system to be interrupted. This might result in you placing yourself and your family in risk, as well as causing damage to your home or garden.

There is a good probability that you will be replacing your present septic system with a new one within a few years.

This is due to the fact that the septic tank you select will be used to service your plumbing system in the future.

Septic tanks made of sorplastic.

Knowing their advantages and disadvantages will assist you in selecting the one that best matches your needs and fits inside your budget.

Plastic Septic Tanks


  • The purchasing price of plastic septic tanks is less expensive than that of concrete septic tanks
  • Thus, they are more cheap. Plastic septic tanks are simple to install since they are lightweight
  • They take just a small number of people to complete the job and require little time and equipment. As a result, installation costs are reduced. Poly septic tanks are lightweight and versatile, making them ideal for travel. This implies that they may be placed in a variety of locations. Plastic septic tanks are waterproof and impervious to corrosion caused by water-based substances. Additionally, they are rust-resistant. Plastic tanks are less prone to cracking than cement tanks because plastic is more flexible than cement
  • As a result, a plastic septic tank does not break as often as a cement septic tank It is more sanitary to use polyethylene septic tanks than than cement tanks
  • Plastic tanks are delivered fully assembled and ready to be fitted.


  • Plastic tanks are not as durable as concrete and are quickly crushed by the weight of the container. Alternatively, they might be crushed by the weight of thick dirt or by vehicles passing over the areas where they are buried. Plastic tanks are also susceptible to the environment, which means that they might burst or crack as a result of changes in soil vibrations and environmental conditions, among other things. Solid-waste disposal systems made of cement, on the other hand, are significantly less responsive to environmental changes. Plastic septic tanks are more susceptible to deterioration than cement septic tanks because they break or wrap more frequently. In comparison to cement septic tanks, plastic tanks require more care to keep them operating properly. Concrete tanks have a longer lifespan than poly septic tanks
  • Nevertheless, they are less durable. In most cases, plastic tanks have low effluent levels and will “float” if the water level in the tank is greater than typical. This “floating” can cause extensive damage to your plumbing system as well as the septic tank itself. Plastic septic tanks are not authorized for use in all states
  • However, in certain areas they are.

Possibly of interest to you is this article: Should you buy a property with a septic system?

Concrete Septic Tanks


  • Cement septic tanks outlast plastic tanks in terms of durability and, if maintained properly, may survive for a lengthy period of time. In the right circumstances, with regular draining and good maintenance, a cement septic tank can endure up to 40 years or more. Cement septic tanks are resistant to changes in the environment, such as tree roots or shifting soil conditions. Concrete tanks are not adversely affected by the weight that is placed on top of them. Comparing cement septic tanks to plastic septic tanks, cement tanks are far more durable and require little maintenance. The fact that concrete tanks are highly hefty and contain large effluent levels means that they are impervious to “floating.” There are no restrictions on using cement tanks in the United States
  • They are permitted in every state.


  • Concrete septic tanks are more expensive to purchase and install than plastic septic tanks, mostly due to the weight of the concrete tanks. Concrete tanks are more difficult to carry and install than plastic tanks due to the fact that they are awkward and more big in comparison. Therefore, the cementseptic tank installation necessitates the use of heavy equipment and requires a significant amount of time. Cement tanks are also more difficult to repair and install than other types of tanks. As your cement tank is broken, it is more difficult to repair it efficiently when compared to plastic tanks. Compared to plastic tanks, cement septic tanks are more prone to corrosion due to the fact that they fracture or corrode as the tanks age, particularly if they are not properly maintained.

Selecting a Septic Tank

For many homeowners in Atlanta, GA, cement is the go-to material since it is permitted in all 50 states in the United States, including Georgia. It has been a long time since cement has been the preferred building material due of its resistance to damage caused by shifting or heaviness. Plastic septic tanks, on the other hand, are less expensive than concrete septic tanks when it comes to cost comparison. It is recommended that you use a plastic tank when you live in a distant place since cement tanks cannot compete with the simplicity with which it can be installed and transported.

Septic tanks made of cement are not recommended for use in areas with significant acidity in the soil.

Despite the fact that there are several aspects to consider when deciding between a plastic and a cement septic tank, examine your location and scenario and choose the choice that feels best for your property.

For all of your septic tank system requirements, contact The Original Plumber.

Plastic vs. Concrete Septic Tanks

It is one of the most crucial components of the complete plumbing system that your septic tank is installed in. Septic tanks are designed to securely handle and treat all of the waste water that you generate. If your septic tank ceases to function, you must have it fixed or replaced as soon as possible. Septic system failures can cause extensive damage to your home’s plumbing system, as well as to your yard and property. They can even put you in danger! Unfortunately, septic tanks are not built to last a lifetime.

The installation of a new septic tank is a major undertaking.

Making the selection on what material to use for your new septic tank will be one of your most significant considerations. Plastic or concrete are the only options available. Here are the advantages and disadvantages of each. ‌

Plastic Septic Tanks

  • Plastic septic tanks are less expensive to purchase and install than concrete septic tanks
  • They are also more environmentally friendly. Easy to carry: Because plastic is significantly lighter than concrete, plastic septic tanks are less difficult to transport to your residence
  • Installation is less difficult: In contrast to concrete septic tanks, installing plastic septic tanks does not necessitate the use of heavy machinery. Also available are plastic septic tanks, which may be installed in a wider range of settings. Inhibition of corrosion by water: Plastic septic tanks are entirely impervious to water-based corrosion. Exceptionally fracture resistant: Because plastic is more flexible than concrete, plastic septic tanks do not crack nearly as frequently as concrete tanks.


  • Plastic tanks are not nearly as durable as concrete tanks and are therefore crushable. It is possible that they will be crushed under the weight of the dirt. Plastic tanks have been known to burst when vehicles drive over the regions where they were buried in the ground. Plastic tanks are sensitive to the environment and may burst or rupture as a result of changes in soil conditions or vibrations in the vicinity. Concrete tanks, on the other hand, are far less vulnerable to environmental degradation. Damage is a possibility because: Plastic septic tanks are more prone to breaking or warping than concrete septic tanks for a variety of reasons, including: Plastic tanks may require significantly more care than their concrete equivalents
  • However, this is not always the case. Concretized septic tanks tend to have a longer lifespan than their nonconcrete counterparts, however this is not always the case.
See also:  How Often Does A Septic Tank Need To Be Pumped? (Solution found)

Concrete Septic Tanks

  • Concrete septic tanks are far more robust than their plastic equivalents
  • They are also less expensive. Exceptionally long-lasting: Concrete tanks can survive for hundreds of years. An untreated concrete septic tank can live for up to 40 years if it is properly maintained and regularly drained. Concrete septic tanks are often not influenced by changes in their surrounding environment, such as shifting soil conditions, the growth of tree roots, or any other difficulties that may arise. Driving over the soil where a concrete tank has been buried will have no effect on it
  • Yet, Septic tanks made of concrete are less prone to failure than those made of plastic since they are more durable.


  • Expenses that are higher: Construction of concrete septic tanks is more expensive than the installation of plastic septic tanks. Installation is more challenging in the following cases: Due to the fact that concrete is heavier and more unwieldy than plastic, installation will take longer and will necessitate the use of heavy equipment. Because concrete tanks are not as resistant to corrosion as plastic tanks, they may ultimately corrode or break as the tanks age. This is more likely to occur if they are not adequately maintained. When it comes to repair, the following is more disruptive: If your concrete septic tank is broken, it might be difficult to repair it effectively, especially when compared to plastic tanks.

Expenses are higher when: Construction of concrete septic tanks is more expensive than the construction of plastic septic tanks. Installing these items is more difficult: The installation of concrete takes longer and necessitates the use of heavy equipment since it is heavier and more cumbersome than the installation of plastic. Because concrete tanks are more susceptible to corrosion than plastic tanks, they might corrode or break over time. if they are not properly maintained, this is more likely to occur.

Poly Septic Tanks vs Concrete: What They Don’t Tell You About Concrete Septic Tanks

The 6th of June, 2019 Septic Systems, CommercialOn-site septic systems are extremely crucial for both your business and your home’s health. When deciding on a polyethylene or concrete tank, it’s important to have a fundamental understanding of both, as well as their pros and downsides. This will help you pick the tank that best suits your needs while also saving you money on installation costs. First and foremost, as previously said, there are two prominent types of materials that are employed in the construction of septic tanks.

Concrete is the stronger of the two materials.

Septic Tank: Concrete vs Plastic

Despite the fact that concrete septic tanks are known to persist for a long time, they have a number of flaws, particularly when maintenance is neglected over time. If the quality is poor, they may even break during the manufacturing process. Advantages of a Concrete Septic Tank

Are said to be long-lasting with proper maintenance.

Disadvantages of Using a Concrete Septic Tank

As mentioned earlier, concrete septic tanks are heavy. Because of their heavy weight, they require different types of heavy equipment during installation, leading to more expense.

Poly septic tanks provide a number of advantages that exceed any potential disadvantages. Disadvantages of a Poly Septic Tank The fact that plastic septic tanks are lightweight and have the potential to “float” when water tables rise is perhaps the most significant reason why many object to their use (e.g. during extremely heavy rainfall). However, there are ways to avoid this from happening in the first place. The 2,200-litre poly septic tank built by Coerco. Advantages of a Poly Septic Tank

Poly septic tanks are watertight despite their lightweight quality.

It is undeniable that both concrete and polyethylene septic tanks require regular maintenance. When it comes to determining which type to choose, though, you might want to think about the long term implications of your decision. What modifications will be done to your property at that point? What about the costs of upkeep, removal, and relocation, for example? Septic tanks made of polyethylene are unquestionably the most trustworthy option if you’re looking for something that’s simple to maintain, install, and transport while also being quite reliable.

Wouldn’t you contact a firm that is competent, well-organized, and inventive and that can meet all of your commercial and household demands if you discovered such a company?

When it comes to purchasing a wastewater tank for your company or household, the industry leader in septic systems is your best choice.

How much does a septic tank weigh?

And what is the significance of weight? Polyethylene septic tanks weigh roughly 200 kilos, but their concrete equivalents weigh approximately 1,500 kilograms, according to the manufacturer. The ramifications of having large septic tanks For many years, concrete has been the material of choice for septic tank construction. Concrete, on the other hand, is a fairly heavy substance. When it comes to establishing a septic system, this results in increased prices. Working with concrete septic tanks entails a number of expenses, the first of which is the purchase of a larger truck and a crane.

  1. The ordinary poly septic tank, on the other hand, weights far less than the conventional cover for a concrete tank.
  2. Is it possible to relocate a septic tank?
  3. Given the weight and difficulty of moving some types of septic tanks – such as concrete – some people find it far easier to just purchase a new septic system rather than attempting to relocate a used septic system.
  4. Notably, because of its weight and vulnerability to collapse, concrete septic tanks are a potential source of hazard for homeowners.
  5. The 4,000-litre poly septic tank built by Coerco.
  6. Note from the editor: This piece was initially published on October 6, 2017, however it has been completely rewritten and modified for the aim of accuracy and comprehensiveness.

Plastic vs Concrete Septic Tanks

And what is the significance of weight in this situation? In comparison, the polyethylene septic tanks weigh roughly 200 kilos, whereas the equivalent concrete tanks weigh approximately 1,500 kilograms. Septic tanks that are overly full have negative consequences. The use of concrete for septic tanks has been the standard for many years now. Concrete, on the other hand, is a massively heavy substance to move. When establishing a septic system, the prices will be greater as a result. It is only the beginning of the expenditures associated with dealing with concrete septic tanks when a larger truck and crane are required.

  • While a typical poly septic tank weighs less than the customary cover for a concrete tank, the latter is significantly heavier.
  • Is it possible to transfer a septic tank?
  • Given the weight and difficulty of moving some types of septic tanks – such as concrete – some people find it far easier to just purchase a new septic system rather than attempting to transfer a previously installed system.
  • Notably, because of their weight and vulnerability to collapse, concrete septic tanks pose a risk of collapse.

It’s a Coerco plastic septic tank, which holds 4,000 liters. Portable and simple to put together. Note from the editor: This piece was initially published on October 6, 2017, however it has been completely rewritten and modified for the sake of accuracy and completeness.

Plastic Septic Tanks

Some of the numerous advantages of adopting a plastic rather than a concrete septic tank are as follows:

  • Unlike concrete sewage tanks, plastic septic tanks are extremely resistant to breaking. Rusting isn’t a problem at all. Because plastic weighs far less than concrete, it is much easier to transport a plastic septic tank to its final installation position. It is more cost-effective to use a plastic septic tank rather than a concrete septic tank. Plastic septic tanks have the potential to be watertight and corrosion resistant.

However, there are some advantages to utilizing a plastic septic tank rather than a concrete septic tank. Some of these advantages include, but are not limited to, the following:

  • Plastic septic tanks have lower effluent levels than concrete septic tanks, which may be noticed when a tank is opened for pumping. If not placed properly, a plastic septic tank has the potential to “float” to the surface of the earth
  • However, this is rare. Because plastic is such a lightweight material, it is susceptible to damage during the installation process. In certain states, plastic septic tanks are not permitted to be used. (You may find resources for your state by clicking here.)

When is it permissible to use a plastic septic tank? When plastic septic tanks are legal in your state and when cost is a big concern, they may be the best option. At the end of the day, you must choose whether a plastic septic tank is the best option for your project.

Concrete Septic Tanks

The advantages are as follows:

  • Compared to plastic septic tanks, concrete septic tanks produce greater quantities of effluent. Because concrete septic tanks are hefty, they have little likelihood of floatation, in contrast to plastic septic tanks, which do. Concrete septic tanks are exceptionally long-lasting and resilient
  • They can survive for decades. There are no restrictions on the use of these septic tanks in any state.

The Disadvantages are as follows:

  • Septic tanks made of concrete are quite pricey. These septic tanks are susceptible to cracking under harsh conditions. The installation of concrete is quite tough due to the weight of the material. Despite the fact that concrete septic tanks are quite resilient, they are more prone to cracking and leaking.

It is highly costly to install concrete septic tanks. Extreme weather conditions might cause these septic tanks to fail completely. The installation of concrete is quite tough due to the weight of the substance. Despite the fact that concrete septic tanks are quite robust, they are more prone to cracking and leaking than other types.

Plastic vs Concrete Septic Tanks. Which Should You Get?

We just purchased a property with an older septic tank, which prompted me to do some research on different types of septic tanks. It was not something I had anticipated spending time on. It had a fracture in it, and the vendor was going to replace it. The old concrete tank had been replaced with a new plastic tank, which I was astonished to discover after it had been replaced and we had moved into the house. I’d always assumed they were all composed of concrete until now. That prompted me to inquire: are concrete septic tanks preferable to plastic septic tanks?

  • However, to break it down fast, concrete septic tanks are excellent for their durability and long life.
  • Because I am very much a septic tank rookie (if there is such a thing), I wanted to learn everything I could about how to properly manage our system before we installed it.
  • I’d also like to know if our plastic tank is durable and will survive for several years, or if it will need to be replaced sooner rather than later.
  • Seeing as how I know that I’m not the only one who has concerns about septic tanks, I decided to put all of my results in one place to make it simpler for you to get the answers you’re looking for, as well.
  • As a result, I’ve included some information on pricing as well.
  • You should expect to pay more fees for labor and other materials if you are having your septic system repaired, replaced, or installed entirely from scratch.
  • A concrete or steel tank, if you have an older tank on your property, is most likely the material used.
See also:  How To Clean Drain With Septic Tank? (Best solution)

The longer they remain in the ground, the more deterioration they experience.


Is it possible to see your youngster running around in the yard and falling into it?!) Septic tank made of old, rotted steel Concrete, fiberglass, or plastic are the most common materials used in contemporary tanks on residential properties.

Here’s what I’ve learnt thus far.

Tanks made of plastic are typically oblong in shape with a lot of ribs on the sides and bottom.

It also aids in their ability to tolerate external pressure such as that exerted by the soil and water.

This is significant because a smooth-sided tank in the ground may be more susceptible to slipping out under certain conditions, such as super-saturated soil from heavy rains, among other things.

Pros: I believe that the weight and expense of a plastic tank are the most significant advantages it has over other solutions.

This implies that you may purchase anything from one of the major home improvement stores and carry it yourself using a truck or trailer to your destination.

The fact that they do have some inherent flex makes them less prone to breaking as a result of ground freezing, which is another advantage of using plastic tanks.

It is more environmentally friendly.

Naturally, this will cause harm to the system and lead you to be unable to use it until the problem is resolved.

Aside from that, even though they are severely ribbed to make them stronger than a smooth-sided tank, they can become warped as a result of the forces of the earth surrounding them.

The typical lifespan of a plastic septic tank should be 30 to 40 years, assuming that it is properly cared for and maintained.

Price per gallon: Of course, prices vary depending on where you live, but it appears that plastic septic tanks cost about $1 per gallon — or about $1,000 for a 1,000-gallon tank and about $1,500 for a 1,500-gallon tank — with a $1,000 tank costing about $1,000 and a 1,500-gallon tank costing about $1,500.

  1. However, I believe that fiberglass outperforms plastic on at least one aspect.
  2. External influences should not have an impact on them.
  3. There aren’t any downsides in this case.
  4. The life expectancy of this product is similar to that of plastic tanks.
  5. In addition, the cost is approximately $1 per gallon, or approximately $1,000 for a 1,000-gallon tank and approximately $1,500 for a 1,500-gallon tank.
  6. They can either be constructed on-site or pre-cast.
  7. The concrete is then poured into the mold, where it is allowed to set and cure while still in the mold.

A different place makes them, and they are delivered to your location for installation.

Pre-cast firms create molds for concrete tanks and other concrete objects, pour the concrete into the molds, and then store the concrete tanks and other concrete items on site until they are transported to the building site.

Concrete will not corrode, rust, or dissolve under normal conditions.

Additionally, the strength of concrete septic tanks will outperform that of plastic or fiberglass septic tanks.

The huge weight of a concrete tank is a possible disadvantage, which you can read about further below, but it is also a good element since the incredible weight means that they are significantly less likely to shift in the ground as they are being built or installed.

First and foremost, they have the potential to break or split, enabling sewage to spill out (although this is unlikely to occur for many years).

The seller was previously aware that it had cracked at one of the top corners and that he would not be permitted to sell the house until it was replaced.

A concrete septic tank with a capacity of 1,000 gallons weighs approximately 8,000 pounds (or 4 tons).

Longevity: If properly cared for, they should easily endure for 40 years or more.

Cost on average: A concrete septic tank is often less expensive than a plastic or fiberglass septic tank, according to what I’ve learned about the industry.

Septic Tanks Made of Steel Currently, I have not seen any stores that sell steel sewage treatment tanks, although these look to be rather old-fashioned in appearance.

However, the potential drawbacks are significant.

Consider all of the times you have come across a metal can that has been buried in the ground for a long period of time, or that has just been exposed to the weather for a long period of time.

Tanks made of steel not only put people’s lives in danger by allowing sewage to seep into the ground, but a rusted steel lid may easily collapse when someone walks over it, throwing the person into the tank!

This is something to bear in mind if you are acquiring or owning a home that already has a steel tank installed, even if buying a steel tank is almost always out of the question.

What is the best type of septic tank to use?

If you want to remain in your home for an extended period of time and if large trucks can readily reach your site, I believe it is worthwhile to spend the extra money to have a concrete septic tank installed for the added piece of mind it provides.

Finally, plastic tanks are the most cost-effective and convenient option for those looking for the lowest possible price and the quickest possible delivery. Now that you have a new septic tank on the way, here are some pointers on how to keep it in good working order.

Plastic Vs. Concrete Septic Tank

Plastic and concrete septic tank alternatives are available whether you’re installing a new septic tank or replacing an existing one, and you’ve probably seen them before. For the most part, homeowners are not overjoyed at the notion of shelling out a significant sum of money for something that essentially does nothing but handle wastewater. Although this is a significant commitment, it is not one that should be taken carelessly. They both have advantages and disadvantages, and we hope that this list will assist you in making a more informed selection.

Plastic Septic Tanks

Plastic and concrete septic tanks are two of the most common types of septic tanks available, whether you’re establishing a new system or updating an old one. The notion of investing a significant amount of money on something that essentially does nothing but handle wastewater does not thrill the majority of households. A significant financial commitment should not be undertaken carelessly, though. The pros and cons of each are listed below, and we hope that this list will assist you in making your decision.


They are rather light in weight due to the fact that they are composed of plastic. They typically weigh a couple hundred pounds and can be handled with relative ease by a standard pickup truck. This means that not only is installation simpler, but it also means that all of the expenditures involved with it are reduced. Simply digging a hole, positioning the tank, and connecting the tank to the rest of your system is all that is necessary. Plastic septic tanks are a more affordable option to concrete septic tanks due to the fact that they are lighter and easier to install.


Compared to concrete septic tanks, plastic septic tanks are significantly weaker. In other words, driving anything over the tank may cause it to be crushed or otherwise damaged. Plastic septic tanks are also more susceptible to environmental variables such as soil vibrations and root penetration, which can cause cracking or warping of the tank’s outside. It is possible to fix some of the damage, but depending on how severe it is, the tank may need to be replaced entirely. In order to function correctly, septic tanks must have an adequate balance of sludge (solids), effluent (water), and scum (lightweight solids) in their contents.

If too much waste accumulates inside the tank, it can cause your system to overflow and the tank to “float” to the surface of the earth, causing damage to the plumbing lines in the surrounding area.

You will need to get them cleaned on a more frequent basis in order to prevent accumulation in the system. When evaluating the entire cost of any system, it is critical to take this into consideration as well.

Concrete Septic Tanks

Septic tanks made of concrete are a more conventional alternative. You have the option of either having a pre-cast concrete septic tank supplied to your home or having a tank put in place on your property. As soon as the prepared option is delivered, it is ready to be implemented immediately. In order to use the poured in place method, you must first dig the hole and then create a mold to shape your tank.


Concrete sewage tanks, in contrast to plastic septic tanks, are extremely long-lasting. Typically, they may be driven over without causing any damage. However, this is not true for your plumbing lines that run to or from the tank, therefore you must use caution when driving in this area of the city. Because concrete septic tanks are massive, they are capable of handling large volumes of sewage without experiencing any issues. This implies that they require less care and cleaning than plastic and can last longer between cleanings.


One of the most significant disadvantages of a concrete septic tank is the weight of the tank. They can weigh many tons, depending on the size of the house you need to build. With this amount of weight, it is evident that large machinery is required for transportation and installation, increasing the entire cost. Environmental variables such as soil vibrations and root penetration are less likely to cause damage to concrete septic tanks than are other types of septic tanks. They are, on the other hand, more difficult to repair than plastic tanks if they are damaged or broken.

There are a variety of criteria that go into selecting which system is the greatest fit for you.

Posts from the recent past

Concrete vs. Plastic Septic Tank

Natalia Kokhanova/iStock/Getty Images is credited with this image.

In This Article

  • Septic tanks made of plastic
  • Septic tanks made of concrete
  • Selecting a septic tank

Septic tanks are a vital part of your property’s infrastructure, and it’s crucial to understand the pros and cons of the many materials that may be used before choosing on a particular type of septic tank to use. Concrete and plastic are the most often used materials for septic tanks, each of which has its own set of problems. Plastic septic tanks are built of a durable plastic that is significantly lighter and more cost-effective than concrete septic tanks. They are also more environmentally friendly.

  • Plastic septic tanks, according to the Pink Plumber, are also fully impervious to water-based corrosion, and because plastic is more flexible than concrete, it is more resistant to some types of damage.
  • The weight of heavy soil or the weight of vehicles driving over the tank might cause the tank to break.
  • They have a lower effluent level and, if the water table is high, they may “float,” rising above the depth at which they were designed to operate.
  • Finally, in certain states, the usage of plastic septic tanks is not permitted.
  • Concrete tanks are more sturdy and resistant to environmental deterioration than plastic tanks, and as a result, they require less maintenance than plastic tanks on average.
  • Concrete tanks are fully impervious to “floating,” and Septic Tank Pro says that concrete tanks have a greater effluent level than other types of tanks because of their weight.
  • Concrete tanks, on the other hand, are significantly more costly, owing in large part to their weight.
  • Installation necessitates the use of heavy equipment, and concrete tanks are often more disruptive to the environment during both the installation and maintenance processes.
  • Concrete is frequently chosen as the default material since it is legal in every state, has been the preferred building material for a long time, and is more resistant to damage caused by weight or shifting than other options.
  • Plastic tanks are far less expensive than concrete tanks, which can cost several thousand dollars or more.
  • Septic tanks made of concrete can be damaged by high levels of acidic groundwater, hence plastic is the preferred material in these circumstances.

Despite the fact that there are several aspects to consider, both concrete and plastic septic tanks are excellent solutions. Take into consideration your current position as well as your geographic area, and then choose the one that feels most right.

Are Concrete Septic Tanks Better Than Plastic?

Disclosure: This post contains affiliate links, which means that if you purchase a product after clicking on one of our links, we may receive a commission or free product from the firms featured in this post. Amazon is a good illustration of this. Materials for constructing septic tanks range from concrete to plastic. Concrete and plastic septic tanks are two of the most often used materials for septic tanks. According to expectations, each form of septic tank has a number of advantages and drawbacks when compared to the others.

  1. Concrete septic tanks and plastic septic tanks will each have their own set of qualities, including a lifespan that is generally longer.
  2. For their part, concrete septic tanks may survive for 40 years or more, making them the most long-lasting solution available.
  3. It is important to note that the type of tank you select (whether it is made of plastic or concrete) is a factor in the process of successfully installing your septic tank.
  4. And if it is not correctly poured, it will most likely collapse in a matter of years rather than decades.
  5. When choosing a septic tank, it is critical that you consider both the pros and downsides of each option.
  6. These advantages include, but are not limited to the following:
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Advantages Disadvantages
Highly resistant to cracks, unlike concrete tanks. The lightweight plastic or fiberglass material it is made of renders it susceptible to structural damage.
Rust-proof May shift in the ground in wet soil conditions.
Lightweight material makes it much easier to transport for and during installation Could rise out of the ground, breaking pipes in the process.
More cost-effective than its concrete counterpart. Not approved in all states.
Water-tight and corrosion-proof. Tendency to have lower effluent levels, which may be discovered after a tank is opened for pumping. This is due to dislodged tank plugs.

We would like to make you aware that this post contains affiliate connections, which means that if you purchase a product after clicking on one of our links, we may get compensation. Amazon is an example of this. Materials for constructing septic tanks range from plastic to concrete. Two of the most popular septic tank materials are concrete and plastic. As might be expected, each form of septic tank has a number of advantages and disadvantages when compared to the others. It’s important to understand that, for the most part, the choice between a concrete and a plastic septic tank is just a question of personal preference.

  1. The typical lifespan of a septic tank built of plastic or fiberglass is 30 to 40 years, which is somewhat longer than that of a steel tank.
  2. For obvious reasons, it is suggested that if you are in the market for a septic tank, you work with an experienced professional who is well-versed in the field and who has access to the necessary tools.
  3. Because concrete tanks may survive practically eternally, assuming a poor grade concrete mix was utilized in their manufacturing, most property owners choose concrete over plastic tanks.
  4. If you are intending to purchase and build a septic tank in the near future and are debating whether to go with concrete or plastic, you will want to continue reading this section of the website.

When choosing a septic tank, it is critical that you understand the benefits and drawbacks of each kind. Septic Tanks Made of Plastic. There are several advantages to utilizing a plastic septic tank rather than a concrete septic tank, which include, but are not limited to, the following benefits:

Advantages Disadvantages
Have higher effluent levels than plastic septic tanks. Susceptible to leaks and seepage through concrete cracks.
Heavy material prevents it from “floating”, unlike with plastic tanks. Vulnerable to cracks under extreme conditions.
May be long-lasting and extremely durable, depending on care and usage. Heavy weight makes it difficult to install.
Concrete tanks are approved for use in all states. More expensive to purchase and install.
Water-tight and corrosion-proof. Requires more frequent regular, periodic inspection and maintenance.

Septic Tank Contractors in Concrete. Concrete has been the traditional building material for septic tanks for for years now, and with good reason: it is strong and durable. Concrete, for starters, is a long-lasting material. A concrete tank may endure for many decades if it is maintained and cared for appropriately. Concrete septic tanks are not only long-lasting, but they are also resistant to damage. Septic tanks constructed of concrete will withstand the rigors of heavy equipment or machinery used in their installation process.

  1. Finally, because concrete is a hefty material, you will not have to worry about your tank (or its contents) shifting within the earth after it has been properly installed.
  2. Concrete septic tanks become more prone to cracking and corrosion as they grow in age.
  3. When a low-quality concrete mix is utilized and/or a structure is constructed using steel support struts, the likelihood of problems increasing exponentially increases.
  4. Because concrete tanks are far heavier than steel tanks, they are significantly more expensive and hard to build, necessitating the use of specialized equipment and a higher level of experience.
  5. As an aside, after a concrete tank reaches the end of its useful life, its high weight results in the same laborious and expensive extraction process as before it was constructed.

Concrete vs. Plastic: A Closer Comparison

Concrete and plastic septic tanks are the two most popular tank kinds that many property owners evaluate when determining which type of septic tank to install, owing to the fact that they are the most prevalent materials used in septic tank construction. Even if there may be several differences between the two materials, the following are the ones that are most likely to be of importance to the majority of people and that you should take into consideration first: Cost. As with other elements of property care, including plumbing concerns, cost is always a factor to consider.

  • Concrete storage tanks are often more expensive than their plastic counterparts in terms of overall cost.
  • Meanwhile, the average price of plastic septic tanks is lower than these typical rates.
  • The volume of wastewater that a septic tank can contain is referred to as its capacity.
  • Naturally, lower-capacity tanks will have a greater tendency to fill with sludge (accumulated solid waste that settles at the bottom of the tank) more quickly, resulting in a greater need for pumping on a regular basis.
  • Additionally, the effluent retention time of a small-sized septic tank is shorter.
  • In the event that your tank’s effluent retention time is significantly reduced, the effluent in your tank will be pushed into the drainfield prematurely — before the liquid and solid wastes have been sufficiently separated to produce what is ideally a clear liquid substance.
  • The durability of the material and the possibility of damage.
  • Concrete septic tanks are more prone to breaking than their plastic equivalents, which is a disadvantage.
  • Effluent can seep out of a septic tank through fractures and contaminate the soil, vegetation, and even water in the nearby area if not properly maintained.
  • The difficulty is that you may not be aware of the seepage until it has progressed to more significant septic issues.

Driving cars or heavy machinery over the area where a plastic tank is buried is a possibility, and damp soil conditions make a plastic septic tank subject to “floating,” “shifting,” and “tilting.”

Your Third Option: Steel Septic Tanks

On the list of several septic tank types, there is a third alternative to consider: steel septic tanks. Steel septic tanks, on the other hand, are both the least durable and the least popular alternative, which is surprising. Steel septic tanks are intended to survive for a maximum of 20 to 25 years in the average environment. This is due to the fact that steel septic tanks are subject to rust corrosion, which might occur well before the 25-year lifespan is achieved. In a similar vein, the steel septic tank lid can rust through and disintegrate, creating a major physical threat to the property’s residents if it caves in under the weight of a person alone.

In addition, these covers may be replaced without having to replace the entire tank, which is a huge advantage.

Additionally, as with any other septic tank, you will need to pay particular attention to the baffles (entry and exit points) of steel septic tanks because they are the first parts of the tank to become corroded.

Just How Important is Septic Tank Design and Construction?

A septic tank must be well-designed and securely constructed in order to avoid cracking or corroding, which might result in groundwater pollution. Consider the design and construction of a septic tank when purchasing one. Determine the effluent levels that each type of tank can hold before making a purchase, as well as other design considerations such as tank inlet and outlet pipes, internal chambers and accompanying transfer pipes, vent pipes, and the design of access manholes. All of these considerations will play a role in the upkeep of the tank you ultimately choose.

Consider the possibility that even the smallest amount of ground movement, particularly in the case of insufficient reinforcements on the tank’s actual placement, might be enough to cause fractures in your septic tank.

Also keep in mind that a fully operating septic tank may be capable of holding up to a metric ton (or 1,000 kg) of liquid for every cubic meter of space.

That is a significant amount of weight.

When you include in your property’s location as well as other logistical considerations, things may quickly get more complicated.

As a result, professional assistance from septic contractors is quite beneficial.

In either case, your septic tank should be flexible enough to remain intact and formidable enough to maintain its integrity in the event of ground movement or drastic soil condition changes.

It is critical that your septic tank has adequate capacity to handle the amount of inhabitants who will be using the system.

The amount of water that enters your septic tank is directly proportional to your way of life or how you use your home or business.

Having additional tenants means there will be more laundry and/or much more kitchenware that will need to be cleaned.

A septic tank should contain at least two chambers to function properly.

The first chamber should be approximately twice as large as the second chamber.

Alternatively, instead of having two separate tanks, you might use a single rectangular septic tank separated into two chambers.

The majority of the sludge (accumulated solid waste) is stored in the first tank or section, while the sewage is subjected to further treatment in the second tank or section to eliminate leftover solid waste.

The quality of your soil has a significant impact on this.

When it comes to this type of decision-making, it goes without saying that both concrete and plastic septic tanks are viable possibilities.

Strong, long-lasting, and far less expensive than concrete, and, should something go wrong down the road, you will not have to expend nearly insurmountable effort or pay a significant quantity of money to have it removed, repaired, or completely replaced.

The first instance is, of course, when concrete is required by local zoning regulations that apply to your property.

When you contact a septic firm, they should be able to come to your house or business site and assess the land and offer a professional suggestion on what type of tank you should build.

It appears to be a broad range, but this is due to the fact that the average lifespan is heavily influenced by factors such as how frequently the system is pumped, how frequently it is examined, and the use patterns of individuals who live on the property.

Having your septic system serviced and maintained on a regular basis is the most straightforward approach to extend its life.

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