The cost of a concrete septic tank typically ranges from $4,500 to more than $19,000, depending on the size and location. In some cases, installation costs can add an additional $1,000 or more to the total cost. Septic tanks are also available in alternative materials such as plastic and fiberglass. These materials are often lighter and easier to install, but they can be more expensive than concrete tanks. As with concrete tanks, installation costs can add an additional expense. Homeowners should also be aware that septic tanks require regular maintenance and pump-outs every 3-5 years. The cost of these services can vary depending on the region and the provider. Septic tank maintenance can be financed using a personal loan if needed.