How Septic Tank Works: Installation and Replacement Costs

How Septic Tank Works: Installation and Replacement Costs

Nina Smith

Nina Smith

Nina is a writer with more than 5 years of experience. She is experienced in such topics as home warranty and home maintenance. She enjoys giving a piece of helpful advice, so don't hesitate to ask her in the comments.

Septic tank work

The septic tank system is a crucial component of most houses. Usually, many homeowners care about the repair, installation, and replacement costs of septic tanks. Additionally, another added issue is how the costs vary by septic tank size, style, and capacity. Septic tank aerator replacement and filter issues must be considered in detail as well. Here, the article will consider septic tank installation cost and how a septic tank works, including:

  • What are the costs involved in septic tank installation and replacement?
  • Different types of septic tank filter
  • Factors affecting the cost of the septic tank
  • Septic tank repair cost

What are the costs involved in septic tank installation and replacement?

Usually, the total cost of installing or replacing a septic tank is between 1500 to 5000 USD. However, these values can change depending on the type of septic tanks used. For example, an anaerobic septic tank costs up to 5000 USD. A similar cost can be estimated for conventional septic tanks; however, you can find a high-quality gravity septic tank under 4000 USD. Other septic tanks are expensive, including Mound Septic Tank, Aerobic Septic Tank, and Chamber Septic tank, where the prices can go as high as 20,000 USD. However, such heavy and expensive tanks are rarely used in home applications. Instead, they are mostly applied in industrial usages.

The Septic tank helps to dispose of the wastewater in your house safely. This wastewater comes from toilets and sinks alike. Usually, an underground chamber is built which treats the wastewater moderately. This way, the solids settle down at the bottom. On the other hand, the grease and oil float. Once the separation occurs, the liquid waste is filtered out from the tank.

Different types of septic tank filter

Septic Tank Filters come in all different shapes, sizes, and models:

  • Anaerobic Septic tanks are the priority of most homeowners. These tanks do not require any additional chemicals to work. Instead, the bacteria inside these tanks can survive without oxygen. They break down the waste in the tanks and distribute the liquid waste under the soil. Water passage through the soil naturally treats the waste.
  • The aerobic system is expensive because the bacteria are dependent on oxygen to survive. Thus, oxygen is actively pumped into the tank. Also, the system is more suitable where the groundwater level is lower. Instead, the houses must be located near a body of water.
  • Gravity Septic System uses the Earth’s gravity to maintain the water flow and process the filter. Usually, such septic systems require a slopy ground to function well.
  • Conventional Septic Systems have a trend that performs the function of a drain field. It has gravel or stone that removes the dirt from the soil. However, such a system requires a large site to work properly and is unsuitable for houses with minimal space available.
  • A mound septic system is perfect if the groundwater table is high. This system treats the waste ins smaller quantities concurrently. However, this design also requires a large space to function properly.
  • Chamber Septic System is becoming the new norm. It is easier to construct and has a reduced negative impact on the environment.

Factors affecting the cost of the septic tank

The type of material used in the septic tank filter is a major determinant of its cost. Using concrete is a common practice due to its durability. An average-sized concrete Septic tank can cost between 750 to 2000 USD. On the other hand, a fiberglass septic tank can cost between 1600 to 2000 USD on average. People may prefer a plastic system due to its ease of installation. Such a system can be cheaper, averaging around 1000 USD. Steel systems are preferred for their durability. 

Septic tank costs also vary based on the size you require. In most municipalities, you need a 1000 gallon septic tank for a two-bedroom house. Similarly, for a four-bedroom house, the requirement increases to 1250 gallons.

Septic tank repair cost

Septic tank repair costs vary based on the component that has been damaged. A drain field repair can cost between 3500 to 11000 USD. On the other hand, a tank pump costs between 500 to 1200 USD. Likewise, you may require a tank lid or tank baffle repair. These components are usually cheaper, with each costing less than 100 USD.

Other factors that may have to be considered are the size of the tank, the area nearby, and the level of digging required to reach the septic tank. In some cases, the prices may increase if the upper surface gets damaged during the repair or replacement.


A septic tank increases the hygiene of your home by disposing of wastewater the right way. Get a septic tank system installed in your home today. Let us know in the comments section if our article was helpful.

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