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Septic Tank Size Installation

The Ultimate Guide: How to Choose the Right Septic Tank Size

Not a lot of homeowners put much thought into their septic system, let alone mull over their septic tank size. More often than not, it’s only when problems arise with your septic tank that you realize how critical it is to choose the appropriate tank size for your septic system. 

If you’re reading this, chances are you’re considering or already have the responsibility of owning a septic system for your lovely abode. Septic tanks are crucial for keeping our homes and environment in tip-top shape. 

Here are some tips and tricks from the Economy Septic Tank service team to help you find the perfect fit for your septic needs without getting too bogged down in the muck!

Down to Brass Tacks: How to ‘Size Up’ Your Tank 

There are seven common types of septic tank systems, each with its specific requirements for tank size. For the purposes of this article, we will focus on the conventional, gravity-fed, anaerobic septic system, as it is the most common and widely used.

Other septic system types, such as pressure systems, aerobic systems, mound systems, and others, may have different size requirements. It’s important to consult with trusted septic system professionals and follow local regulations to ensure you choose the right septic tank size for your specific system. 

Single-Family Homes: The Cozy Tank

For those with a single-family home, your septic tank size is usually the smallest of the lot. A tank in the range of 750 to 1000 gallons will usually do the trick for most households. This size accommodates the average water usage of a family and provides enough space for solid waste to settle down while letting the water make its way out.

Double the Fun: Multi-Family Properties

Now, if you own a duplex, triplex, or even a charming fourplex, things change a bit. More people means more water usage and more solid waste produced. But fear not, it’s not rocket science! For a multi-family property, a general rule of thumb is to add around 250 gallons per bedroom. So, a duplex with two bedrooms each might want to opt for a 1500-gallon tank, while a three-bedroom triplex might consider a 2000-gallon septic tank.

Small Business, Big Tanks

If you’re, say, a business-savvy homeowner and have a small inn, bed & breakfast, or vacation cabins for rent, you will also need to size up your tank game. Commercial establishments typically have higher water usage due to the constant influx of guests. So, for these kinds of ventures, aim for a minimum of a 2500-gallon tank. If your place is often teeming with visitors, you might want to go even bigger to prevent any unfortunate bathroom mishaps. Remember, it’s much better to be safe than sorry!

A Word on High-Traffic Areas

Living near popular attractions or having a large family reunion spot in your neck of the woods can be both a blessing and a challenge. With more people flocking to your property, you need a septic system that can handle the load without breaking a sweat (or, dare we say, spilling the beans). Consider going for a beastly 3000-gallon tank or more in such high-traffic areas, depending on the estimated water usage.

Local Government Regulations

Local government regulations for septic tanks can vary significantly from one area to another. The variations are influenced by the diverse soil geographies and water features that differ by state and region. It is vital to check with local government regulations to determine the approved septic tank size and the suitable installation location on your property.

Each state or county may have specific codes, rules, and regulations governing septic tank installations. Before proceeding with any septic tank installation, review the relevant documents and consult with the local health department to ensure compliance with the rules.

Suitability of the Ground Geology

You may not know this yet, but the soil type where your septic system is installed plays a significant role in determining the effectiveness of the septic system, which, in turn, impacts the durability of your septic tank. The soil’s ability to handle and filter septic tank effluent is assessed through a soil percolation evaluation, also known as a perc test. A certified professional performs these tests to determine the viability of the ground for a septic tank system.

The results of the perc test and ground area evaluation will influence the septic tank size and the type of system needed. It is essential to schedule these tests with the oversight department or a certified professional to make informed decisions about your septic system.

The Expected Volume of Wastewater

Another critical factor in determining the appropriate septic tank size for your household is the volume of wastewater you and your family produce. As aforementioned, the minimum septic tank capacity is based on the number of bedrooms in the house, as this often correlates with the expected wastewater volume.

For a home with two or fewer bedrooms, a starting point is a 1000-gallon septic tank, which can be suitable. For homes with three bedrooms, a 1000 to 2000-gallon tank may be recommended. Additional fixtures, such as large bathtubs or laundry sinks, may also influence the required tank size.

Finding the Best Septic Tank For Your Needs

It’s plain to see that septic tanks truly play a crucial role in the proper treatment of household wastewater. Knowing the best septic tank size for your home is a key step in ensuring an efficient and effective wastewater treatment system. You need to keep in mind that specific septic system type, local government regulations, ground geology, and expected volume of wastewater are all critical factors to this decision.

To accurately determine the right septic tank size, consult with the appropriate local authorities as well as trusted septic tank service professionals, and take into account the specific features of your home.


Get the Right Fit for Your Septic System with Economy Septic Tank Service 

If you’re on the hunt for a quality septic tank service provider in Northern Alabama, look no further! Economy Septic Tank Service is Northern Alabama’s trusted partner for septic system service and maintenance. 

Whether it be residential or commercial septic systems, our team’s got you covered! They’ll guide you through muddy waters and ensure that your system does not only stay in tip-top shape, but is also fitted with the appropriate tank size.

Contact Economy today to know more!