The average cost to build a concrete septic tank is about $4,500, as of 2015. Most homeowners spend between $2,351 and $6,748 for concrete septic tanks, which are the most common tanks on the market. They typically last for several decades.
Though concrete septic tanks can last for many years, they require manual inspection on a regular basis to ensure there are no cracks or runoff. The cost of a concrete septic tank may depend on the size of the unit as well as the preparation necessary before it is installed. Permits and labor are additional costs involved in the installation.