How Much Does a Septic System Cost?

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The septic system is composed of a small scale sewage system which is common in areas that have no connection to the main sewage pipes provided by the local government or private corporations.  In fact, according to the American Ground Water Trust, one in three Americans have a septic system.  This system is designed to collect your wastewater and dispose of it.

The cost to install septic system depends on the size of the septic tank, the type of septic system, the complexity of the installation, geographical location and company installing the system.

Septic Systems and Steep Slopes by SoilScience.info, on Flickr
Septic Systems and Steep Slopes” (CC BY 2.0) by SoilScience.info

How much does a new septic system cost?

Type of Septic TankHow it Works?Average Price
Aerobic unitThis system mixed airs into wastewater, which allows the bacteria to break down the solids quicker. Some units, depending on the model you choose, can also use a fluid with chlorine to disinfect the water.$5,000 to $8,000
Drip irrigationThis system requires a shallow drain field where water will slightly trickle out over a wider area from a pump. When installed, flexible tubing will be piped out to the field.$3,000 to $12,000
Mound systemThis system will be used when the soil is too thin or your soil has too much clay in it. With this system, a pile of sand and gravel will be buried within the drainfield to filter the water as it leaves the tank.$10,000 to $20,000
Sand filterA sand filter will work with both a tank and an aerobic treatment unit. This filter consists of a larger buried box that's filled with sand. As the pump releases water to the top, it filters through the sand before it lands in the drainfield.$5,000 to $12,000
Standard system made of concrete, fiberglass or polyethyleneA conventional system will carry the wastewater from the house, into the tank and then out to the drainfield. This box will commonly made from either concrete, polyethylene or fiberglass. As the water pools in the tank, it will eventually separate and flow out to the field.$5,000 to $11,000

Factors that affect the cost

What is going to be included?

What are the extra costs?

Tips to know:

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