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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.
The cost to build a septic tank system varies widely, depending on your location. According to SepticTankGuide.com, a standard or conventional gravity system for a 3-bedroom home on a level site with good soil would likely cost from $1,500 to upward of $4,000.or reference, 100 feet of 4-inch perforated PVC piping costs $65 to $80. A septic tank riser allows above-ground access to your tank and can considerably reduce the cost of maintaining your system. Septic tank risers are commonly made from polyethylene, PVC or concrete.