Septic Tank Installations: Different Types and Benefits Explained

Septic tank installations are a crucial part of wastewater management systems, particularly in areas where access to public sewer lines is limited or unavailable. These underground systems play a vital role in safely and efficiently treating household wastewater, preventing environmental contamination, and ensuring public health.

What Are The Different Types of Septic Tanks and Their Benefits?

1. Conventional Septic Tanks
Conventional septic tanks are the most common type of septic systems. They consist of two primary chambers where wastewater flows in and undergoes a natural biological process that separates solid waste from the liquid. The separated effluent is then discharged into the drainfield for further treatment.

Cost-effective: Conventional septic tanks are generally less expensive to install than other advanced systems.
Low maintenance: With no moving parts, they require minimal maintenance and are relatively easy to service.
Adequate treatment: When installed and maintained correctly, conventional septic tanks can provide adequate treatment for wastewater.

2. Aerobic Septic Tanks
Aerobic septic tanks differ from conventional tanks as they use oxygen to facilitate the breakdown of organic matter more efficiently. They contain aerobic bacteria that digest the waste faster, resulting in cleaner effluent.

Enhanced treatment: The aerobic process leads to a higher level of wastewater treatment, reducing the risk of groundwater contamination.
Smaller drainfield: Since the effluent is cleaner, the drainfield can be smaller, making it suitable for properties with limited space.
Better for compacted soils: In areas with less permeable soils, aerobic septic tanks can be a suitable alternative.

3. Cesspool and Drywell Systems
Cesspools and drywells are simple, older types of wastewater disposal systems that may still be in use today. Cesspools are pits lined with concrete or other impermeable materials that allow wastewater to leach into the surrounding soil. Drywells are similar but typically consist of larger, covered holes filled with rocks or gravel.

Cost-effective: Cesspools and drywells are often more affordable to install than conventional septic systems.
Suitable for certain soil types: They can work well in areas with specific soil conditions, such as higher groundwater levels.
Simplicity: These systems have no moving parts, making maintenance straightforward.

What Is The Septic Tank Installation Process?

Site Assessment and Permits
Before installing a septic tank, a thorough site assessment is essential. Soil tests are conducted to determine soil permeability, water table levels, and potential environmental impacts. Local health departments and regulatory agencies may require permits, so it's crucial to obtain the necessary approvals before proceeding.

Excavation and Tank Placement
The installation process begins with excavation, where a hole is dug to accommodate the septic tank. The tank's size is determined based on the household's wastewater output and local regulations. Proper placement is crucial to ensure efficient operation and prevent damage to the tank.

Septic Tank Installation
Once the hole is ready, the septic tank is carefully lowered into position. It is crucial to ensure that the tank is level and well-supported to prevent structural issues and possible leakage in the future. Connections are made to the household plumbing system, allowing wastewater to flow into the tank.

Plumbing and Inlet/Outlet Installation
The plumbing between the house and the septic tank is connected, directing wastewater into the tank's inlet. Effluent leaves the tank through the outlet and enters the drainfield for further treatment.

Drainfield Installation
The drainfield, also known as the leachfield or absorption field, is where the final treatment of effluent occurs. Perforated pipes distribute the treated wastewater over a specific area, allowing it to percolate through the soil. The soil acts as a natural filter, removing harmful pathogens and pollutants from the water.

System Testing and Backfilling
After installation, the septic system undergoes thorough testing to ensure proper functioning and no leaks. The tank is backfilled with soil, taking care not to damage the tank or plumbing during the process.


Septic tank installations are critical for managing wastewater in areas without access to centralized sewer systems. Homeowners & business owners can make informed decisions about the most suitable system for their property, simply by understanding the different types of septic tanks and their benefits. Moreover, a well-executed septic tank installation process ensures the system's longevity, efficiency, and minimal environmental impact. Regular maintenance and responsible usage will help keep the septic system functioning optimally for years to come. For expert septic tank installations, trust the pros at Underground Septic. Call us today for your free septic tank installations estimate at (678) 573-4770

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