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Question DetailsAsked on 9/22/2014

how much to install a 2500 gallon septic tank?

Septic tank to be installed 4ft underground, with drains going 20 ft down, no basement pump is needed.

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1 Answer


You said septic tank, not septic system - so I presume you meant just the tank, though I do wonder because you talked about the drains going 20' down - which I presume you meant 20' out laterally, unless you are in an area that allows cesspools.

The tank itself runs from about $1000-4000 depending on whether plastic (cheapest) and what type (PVC, HDPE, etc) or steel, what traffic load is allowed over it, etc - commonly about $1500-2500 for that size in most installations. Installation, assuming decent digging for a typical small backhoe about $1000 more including connecting up the piping - can be double that if very hard digging, and more again if bedrock though you rarely find a situation where the tank needs to be in bedrock. This assumes it is going in clean ground- that you are not digging up sewage-contaminated soil from an existing leaking tank that needs to be hauled away, which can increase your cost quite a bit - as much as several thousands in areas where it has to be disposed of in a landfill as hazardous material.

Answered 5 years ago by LCD

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