Sewer Time Septic and Drain

How Much Does a New Septic System Cost?

How Much Does a New Septic System Cost?

A common questions of homeowners and homebuilders is “How much does a new septic system cost?”. While there is no simple answer because each septic system is custom designed for each install there are some general figures we can take a look at.

Understanding Different Types of Septic Tanks and Systems.

There are a few common types of septic systems that are installed at homes and offices. The most common type being a conventional gravity fed system:

Conventional Septic System:

A conventional septic system usually means a system that is gravity fed. The distribution and function of the system excludes things such as grinders, lift pumps, and pressure distribution tanks. A conventional septic system usually has one tank with two compartments but there are exceptions to this specific rule especially in larger conventional systems.

Waste will typically flow downhill at a slight slope from your home or business plumbing to your stub-out where your septic tank is connected. Once into the septic tank the solids of your sewage will settle to the bottom of the first chamber of the tank while the waste water or effluent will pass through a center tank baffle into the second compartment of the tank. This effluent water is mostly free of solids allowing it to pass out of the septic tank through the outlet and into your drain-field or soil treatment area.

Conventional Drain Field/Soil Treatment Types:


Chambers are one common way of dispersing your septic effluent into the ground to be treated. They are small domed poly structures that are installed in rows or trenches underground to collect the effluent that leaves the septic tank and slowly disperse it into the soil. These are a favorite of Sewer Time as they allow for great peak usage and are not prone to clogging or backup.

Rock Trench:

Septic Rock Trenches have been around forever and are a still a very common and reliable way of treating your septic effluent. Once the effluent leaves the tank it is transported down perforated drain pipes into underground trenches that are filled with rock. The rock allows the water to slowly absorb into the soil around the trench for treatment. Rock trenches are great ways of treating your septic waste but it is very important to keep your septic system maintained properly. If you allow any types of solids into your drain field it is possible for your perforated pipes to become clogged cause sewage backup into your tank and home.

Seepage Pit:

A seepage pit is very similar to a rock trench but instead of long horizontal trenches, a large diameter hole (usually 36″-48″) is drilled deep into the ground. The depth of the pit is determined by the are that it is drilled. Usually they are anywhere from 25′-50′ deep. The same rules apply to pits as trenches in that it is important to prevent solids from entering the disposal area to reduce chances of clogs and backups.

What is the cost of a conventional septic system?

The typical conventional septic system will usually cost anywhere from $13,000 to $15,000. This will typically include the soils testing, design of the system, as well as parts and installation. The big caveat to this is that it will depend on your area and size of system required for you home.

Sewer Time offers full service soil testing, design and Installation in the Greater Phoenix Area for all types of conventional systems. Contact Us or call (602) 777-7867 for assistance with your conventional system.

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