Upgrading Your Septic System: When and Why To Consider an ATU

May 20, 2025

At Alternative Septic Management, we work with Georgia homeowners every day to improve the performance and longevity of their on-site wastewater systems. Traditional septic systems may be sufficient in many cases, but for properties with unique environmental conditions or increased wastewater demands, upgrading to an Aerobic Treatment Unit (ATU) can offer major advantages. In this article, we explore when and why an ATU may be the best solution, how it works, and how it can benefit both your property and the environment.


Understanding Aerobic Treatment Units


An Aerobic Treatment Unit, or ATU, is a type of advanced septic system that uses oxygen to enhance the breakdown of organic waste. While traditional septic systems rely on anaerobic bacteria to digest waste in low-oxygen conditions, ATUs create a high-oxygen environment that supports aerobic bacteria, which are more efficient at breaking down waste materials.


This process results in cleaner effluent, reduced odors, and greater protection of surrounding soil and groundwater. The treatment stages typically include:


  • A pretreatment tank to separate solids
  • An aeration chamber where air is introduced to support aerobic bacteria
  • A clarification chamber to allow any remaining solids to settle
  • Optional disinfection before effluent is released into the soil


ATUs are especially beneficial in areas with poor soil percolation, shallow groundwater, or limited space for traditional drain fields.


Signs It's Time To Upgrade


Several indicators can help determine whether an upgrade to an ATU is the right move for your property. These include:


Persistent Septic System Issues


If you notice ongoing problems such as slow drains, backups, or surface pooling near the drain field, your existing system may not be functioning effectively. These symptoms often point to a failing drain field or overburdened tank, both of which could be resolved with a more advanced treatment system.


Changes in Property Use


If you're adding more bedrooms, installing a second kitchen, or expanding your home in any way that increases wastewater output, your current septic system may not be able to keep up. An ATU can handle greater capacity and reduce the strain on your system.


Environmental Considerations


Living near lakes, streams, or wetlands may place your property in a high-sensitivity zone. In these cases, Georgia regulations may require enhanced treatment systems to protect water quality, making ATUs a responsible and sometimes necessary upgrade.


Local Soil or Site Conditions


Clay-heavy soils or areas with high water tables reduce the soil's natural ability to treat wastewater. An ATU can treat the water more thoroughly before it's released, helping to avoid soil saturation and groundwater contamination.


Benefits of Installing an ATU


Upgrading to an ATU offers more than just regulatory compliance. It can significantly enhance the performance, lifespan, and reliability of your system.


Improved Wastewater Treatment


Aerobic bacteria are more efficient than anaerobic bacteria, meaning an ATU produces clearer, cleaner effluent. This reduces the likelihood of soil clogging or the need for costly repairs to drain fields.


Greater System Longevity


Because ATUs process waste more completely, they reduce the buildup of solids and strain on the drain field. This can extend the life of your entire system.


Smaller Drain Field Requirements


ATUs are often used where land is limited, as the more effective treatment process means a smaller absorption area is needed. This can be useful in urban areas, sloped lots, or homes with limited outdoor space.


Environmental Protection


High-quality effluent produced by ATUs helps prevent nutrient pollution, reduces the spread of pathogens, and is less likely to impact groundwater or surface water. This is a key benefit in protecting ecosystems and meeting health standards.


Potential Property Value Increase


An upgraded septic system can improve property value by demonstrating environmental responsibility and offering a long-term solution for wastewater treatment. For prospective buyers, a well-maintained ATU system can be a selling point.


Maintenance Considerations


It's important to understand that while ATUs offer better performance, they do come with maintenance responsibilities. Unlike traditional systems that can go years between service visits, ATUs require:


  • Regular inspections (typically every 6 months)
  • Cleaning of filters and components
  • Occasional pumping, just like traditional tanks
  • Reliable electrical service to keep aerators functioning


At Alternative Septic Management, we offer comprehensive maintenance plans to keep your ATU operating efficiently and prevent small issues from becoming costly repairs.


Choosing the Right Time To Upgrade


Deciding when to upgrade to a septic tank alternative depends on your current system's condition, your future property plans, and your local environmental factors. Homeowners often choose to upgrade:


  • When replacing a failed or aging septic system
  • During major home renovations or additions
  • After a property transfer or in preparation for selling
  • When required by local health departments or zoning changes


We can help you assess your property, perform a site evaluation, and determine whether an ATU is the best solution for your needs.


How Alternative Septic Management Can Help


At Alternative Septic Management, we specialize in the design, installation, and long-term care of aerobic treatment systems throughout Georgia. Our team is trained in the latest ATU technologies and stays up to date with all state and local regulations.


We guide you through every step of the process:


  • Evaluating your site and soil conditions
  • Designing a system that meets your household and property needs
  • Coordinating permitting and regulatory compliance
  • Installing and commissioning the new ATU
  • Providing maintenance and service over the system's lifespan


Trust Alternative Septic Management for Your ATU Upgrade


Whether your current septic system is underperforming or you're planning ahead for the future, an aerobic treatment unit can offer a smart, reliable, and environmentally conscious solution. At Alternative Septic Management, we’re proud to help Georgia homeowners upgrade their systems with confidence and ease.


Contact us today at (404) 788-3474  or visit our website to schedule a consultation and learn more about whether an ATU is the right choice for your property.

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