For You: Flexibility And Efficiency. ADP supports a full spectrum of spending and reimbursement accounts, including flexible spending accounts (FSA), health savings accounts (HSA) and more. Our services offer flexible options and multiple opportunities for cost savings.
1 The cost of a septic tank alone runs about $500-$1,800 depending on size (ranging from 300-1,000 gallons) and type. 2  Piping and other needed items adds another $100-$200 to the total cost of materials. 3  New Mexico State University provides an introduction to installing a septic tank.
1 Mound System-A mound septic system cost will depend largely on the slope and grade of the property, and these systems can cost from $9,000 to $25,000 or more. 2  This type of system can have many variables which can affect the cost you will pay.verage Septic System Cost By Type. 1  Standard Gravity System-A system that is typical and uses gravity will usually cost between $3,500 and $7,500 to install. 2  This does not include the permit costs or other necessary expenses, simply the testing and system purchase and installation.