The Benefits of Aerobic vs. Anaerobic Septic Systems: Which Is Right for You?

If your property isn't connected to a city sewer system, a septic system is essential. When you need to install or replace one, you've got two choices — an aerobic or an anaerobic system. Both do the same job in different ways. This guide breaks down how they work, where they work best and how to figure out which one makes sense for your property.

How Does an Anaerobic Septic System Work?

An anaerobic system relies on bacteria that thrive without oxygen to break down waste. It consists of a septic tank and two main pipes. One leads from the home to the tank, and one distributes liquid waste into the yard.

Inside the tank, solid waste settles to the bottom while anaerobic bacteria break it down. Liquid waste flows into underground pipes with small holes, allowing it to slowly pass through into the surrounding soil for natural filtration. 

How Does an Aerobic Septic System Work?

An aerobic septic system is a little more advanced. It involves three stages of treatment. 

• Stage 1: Wastewater first enters a pretreatment tank, where solids settle. 

• Stage 2: The water then flows into an aeration chamber, where a pump adds oxygen to support aerobic bacteria that break down the waste. 

• Stage 3: The final tank further disinfects the water, often using chlorine. The treated water is then released into the yard, often via sprinkler heads. 

How to Choose Between Aerobic vs. Anaerobic Septic Systems

Consider the following when choosing a septic system for your property:

Cost

Anaerobic systems are more affordable upfront. Their simple design means fewer components, no electricity, and lower installation and maintenance costs.

Conversely, aerobic systems come with higher initial costs due to extra components like aerators and control panels. They also require electricity to run the system and occasional part replacements, which can add to long-term expenses.

Soil and Land Conditions

Anaerobic systems rely on soil to do part of the work. If your soil drains well, that's fine, but it can cause problems if it's dense or has a lot of clay. Aerobic systems don't depend on the soil as much, and since they pretreat the water, they're better for properties with poor drainage.

Land slope has a similar impact. Anaerobic systems work best on gently sloped land, while aerobic systems can work efficiently on flat or uneven surfaces since they use pumps to move water.

Treatment Quality and Environmental Impact

Aerobic systems clean the water more thoroughly. That means less odor, lower risk of contamination and longer drainfield life.

Anaerobic systems are better suited for rural areas with plenty of land and no nearby water sources because they break down waste more slowly, produce odors and provide lower overall treatment quality.

Local Regulations

Before you decide, check with your local health or building department. Some counties require aerobic systems based on soil tests or property location. Installing the wrong one could be a costly mistake.

Get Expert Septic System Support Today

No matter which system you choose, regular maintenance is key to its performance. Bolton Environmental provides reliable septic tank cleaning and maintenance for homes, businesses and municipal properties throughout Monroe and Lenawee counties. 

Call us today or book your service online. We're here to help you keep your property at its best for years to come.