Single vs. Double Compartment Septic Tank: Which One to Use?
As the trend towards self-sufficiency and living off the grid gains momentum, managing one’s waste has become an essential issue. For homeowners in remote or rural settings that lack public sewer connections, the significance of septic tanks cannot be overstated. This article examines the differences between single vs double compartment septic tanks, their specific use cases and the advantages of choosing plastic tanks over their concrete counterparts.
Single vs. Double Compartment Septic Tanks
A single-compartment septic tank, or one compartment septic tank, is the most basic and common type of tank used in residential sewage treatment systems. The tank has one chamber that holds all of the incoming wastewater and allows for the separation of solids from the liquid effluent. The single-chamber design is simple, cost-effective and generally works well for smaller homes with low water usage. However, single-compartment tanks may not provide the same level of solids retention and effluent quality as double-compartment tanks, which can potentially lead to increased maintenance requirements and a greater risk of drain field clogging.
A double-compartment septic tank, or two compartment septic tank, is designed with two distinct chambers. Typically, the first chamber is larger than the second one. In the first chamber, raw sewage is collected and allowed to settle. As it settles, heavier solids sink to form a layer of sludge at the bottom, while lighter materials like grease and oils rise to create a scum layer on the surface.
The liquid effluent between these layers then moves into the second chamber. The second chamber acts as an additional treatment stage to provide further settling and digestion of any remaining solids. The end result is a higher-quality effluent that is eventually discharged into the drain field.
To better understand how a septic tank system works, check out our guide that includes a diagrammatic illustration of a septic system.
Double, or two compartment septic tanks offer several benefits including:
- Better solids retention
- Improved effluent quality
- Reduced risk of drain field clogging
- Longer tank lifespan
The improved solids retention also means that the two chamber tank will require less frequent pumping and maintenance. The enhanced performance of double-compartment tanks makes them a popular choice for larger homes, commercial properties or areas with stricter environmental regulations.
Property Size and Water Usage
Single-compartment tanks are generally more suitable for smaller homes with low water usage while double-compartment tanks are recommended for larger homes, commercial properties or those with high water usage. Our septic tank size chart guide breaks down the proper sizing considerations for your onsite wastewater treatment system.
Environmental Regulations
Double-compartment tanks provide improved effluent quality and may be required in areas with more stringent wastewater treatment requirements. That said, always check your local codes and regulations to find the recommended septic system for your region.
Maintenance Frequency
Double-compartment tanks typically require less frequent pumping and maintenance, which can be a cost-saving benefit over time. Generally, the larger the waste holding tank, the less frequent the pumping required.
Initial Cost
Single-compartment tanks are overall less expensive to install than double-compartment tanks, but the latter may provide more long-term savings due to lower maintenance costs.
Plastic vs. Concrete Septic Tanks
While concrete has been the traditional choice for septic tanks, plastic tanks have gained popularity in recent years due to their numerous advantages. Plastic septic tanks are lightweight and easier to transport and install, which reduces labor and installation costs.
They are also less susceptible to cracking, corrosion and leaks thereby promising a longer lifespan and a reduced risk of environmental contamination. Additionally, plastic septic tanks are generally more cost-effective than their concrete counterparts.
Single vs Double Compartment Septic Tanks: Product Recommendations from Tank Depot
For those seeking reliable septic tank options, Tank Depot has a variety of high-quality single and double-compartment plastic tanks to suit your needs. We also have above-ground options for commercial waste holding scenarios.
Single Compartment Septic Tanks
The Norwesco 1,000 Gallon Single Compartment Septic Tank is a lightweight, durable plastic tank that is suitable for small homes and properties and provides efficient wastewater treatment with minimal maintenance requirements.
The Ace/Den Hartog 1,250-Gallon Single Compartment Septic Tank features a larger capacity tank designed to handle the wastewater treatment needs of medium-sized homes or properties with moderate water usage.
Double Compartment Septic Tanks
The Norwesco 1,500 Gallon Dual Compartment Septic Tank is ideal for larger homes and commercial properties, as it boasts an improved solids retention capacity and reduced maintenance frequency due to its dual-compartment design.
The Norwesco 1,000 Gallon Single Compartment Septic Tank is a lightweight, durable plastic tank that is suitable for small homes and properties and provides efficient wastewater treatment with minimal maintenance requirements.
The tank is extremely robust as it is formed through rotational molding and has no seams, decreasing the likelihood of leaks. This tank does not need special backfill or water filling during installation. Additionally, it can be pumped dry easily during pump-outs.
Upgrade Your Wastewater Management Today with Tank Depot’s High-Quality Plastic Septic Tanks
Plastic septic tanks from Tank Depot are a dependable and budget-friendly choice for homeowners and property managers seeking sturdy and lightweight wastewater management alternatives to conventional concrete tanks. Whether you need a single or double compartment septic tank, we offer the highest quality septic and water storage tanks at the at the best prices in the market.
Contact us today to find out more or locate a store near you!
