A typical residential septic tank is usually about 4.5 feet wide x 8.0 feet long x 6 feet tall.
What is the average size of a residential septic tank?
- Septic Tanks are usually about 4.5 feet wide x 8.0 feet long x 6 feet tall. Tanks are typically buried 4 inches to 4 feet deep depending on local site conditions, shape, slope, and other factors. Here is the basic math for computing septic tank capacity (volume) in gallons.
What is standard size of septic tank?
Length of septic tank (L) should be taken as 9feet 9 inches or 9.75 feet. Breadth of septic tank (B) should be taken as 6 feet 3 inches or 6.25 feet. The standard height (D) of septic tank should be taken as 5 feet 9 inches or 5.75 feet.
What should be the length and width of septic tank?
The code recommended that a septic tank serving 10 people should have a dimension of 2.032m (length), 0.457m (width) and 1.22m (depth) giving a total volume of 1.13m3. This implies that the tank will need desludging about every two years.
How deep and wide is a septic tank?
Septic tanks are typically rectangular in shape and measure approximately 5 feet by 8 feet. In most cases, septic tank components including the lid, are buried between 4 inches and 4 feet underground. You can use a metal probe to locate its edges and mark the perimeter.
How do I calculate the size of my septic tank?
The formula is length (feet) x width (feet) x 1 foot x 7.5 gallons, which is the volume for 1-foot depth. To find the volume for 1 inch I divide the volume by 12 to give me gallons per inch. For our example this is 5.16 feet x 7.5 feet x 1.0 foot x 7.5 gallons per cubic foot = 290.2 gallons.
How do you size a septic tank?
Septic Tank Size Calculation based Per User Consumption
- Cooking – 5 Liters.
- Bathing & Toilet – 85 Liters/Person, So for 5 person – 425 liters/Day.
- Washing cloths & Utensils – 30 Liters.
- Cleaning House – 10 Liters.
- Other – 5 Litres.
How often does a 1000 gallon septic tank need to be pumped?
For example, a 1,000 gallon septic tank, which is used by two people, should be pumped every 5.9 years. If there are eight people using a 1,000-gallon septic tank, it should be pumped every year.
How deep should a septic tank be in the ground?
The general rule of thumb is that most septic tanks can be buried anywhere from four inches to four feet underground.
What size of septic tank do I need?
Probably one of the last things on your mind when you are constructing a new house is the location of your septic system. After all, shopping for tanks isn’t nearly as entertaining as shopping for cabinetry, appliances, and floor coverings. Although you would never brag about it, your guests will be aware if you do not have the proper septic tank placed in your home or business.
septic tanks for new home construction
The exact size of the septic tank is determined mostly by the square footage of the house and the number of people who will be living in it. The majority of home septic tanks have capacities ranging from 750 to 1,250 gallons. A 1000 gallon tank will most likely be required for a typical 3-bedroom home that is smaller than 2500 square feet in size. Of course, all of this is dependent on the number of people who live in the house as well as the amount of water and waste that will be disposed of through the plumbing system.
For the most accurate assessment of your septic tank needs, you should speak with an experienced and trustworthy sewer business representative.
planning your drainfield
Here are some helpful hints for deciding where to locate your drainfield when you’re designing it.
- Vehicles should not be allowed on or around the drainfield. Planting trees or anything else with deep roots along the bed of the drain field is not recommended. The roots jam the pipes on a regular basis. Downspouts and sump pumps should not be discharged into the septic system. Do not tamper with or change natural drainage features without first researching and evaluating the consequences of your actions on the drainage field. Do not construct extensions on top of the drain field or cover it with concrete, asphalt, or other materials. Create easy access to your septic tank cover by placing it near the entrance. Easy maintenance and inspection are made possible as a result. To aid with evaporation and erosion prevention, plant grass in the area.
a home addition may mean a new septic tank
Do not make any big additions or renovations to your house or company until you have had the size of your septic system assessed. If you want to build a house addition that is more than 10% of your total floor space, increases the number of rooms, or necessitates the installation of new plumbing, you will almost certainly need to expand your septic tank.
- For a home addition that will result in increased use of your septic system, your local health department will require a letter from you that has been signed and authorized by a representative of your local health department confirming that your new septic system is capable of accommodating the increase in wastewater. It is not recommended that you replace your septic system without the assistance of a certified and competent contractor.
how to maintain your new septic system
Septic tank cleaning and septic tank pumping services are provided by Norway Septic Inc., a service-oriented company devoted to delivering outstanding septic tank cleaning and septic tank pumping services to households and business owners throughout the Michiana area. “We take great delight in finishing the task that others have left unfinished.” “They pump, we clean!” says our company’s motto. Septic systems are something we are familiar with from our 40 years of expertise, and we propose the following:
- Make use of the services of a qualified specialist to develop a maintenance strategy. Make an appointment for an annual examination of your septic system. Utilize the services of an effluent filter to limit the amount of particles that exit the tank, so extending the life of your septic system. Waste items should be disposed of properly, and energy-efficient appliances should be used. Make sure you get your septic system professionally cleaned every 2 to 3 years, or more frequently if necessary, by an experienced and qualified expert
- If you have any reason to believe that there is an issue with your system, contact a professional. It is far preferable to catch anything early than than pay the price later. Maintain a record of all septic system repairs, inspections, and other activities
common septic questions
Here are some of the most frequently asked questions by our septic customers.
How do I determine the size of my septic tank?
If you have a rectangular tank, multiply the inner height by the length to get the overall height of the tank. In order to find out how many gallons your septic tank contains, divide the number by.1337.1337
How many bedrooms does a 500-gallon septic tank support?
The exact size of the septic tank is determined mostly by the square footage of the house and the number of people who will be living in it. The majority of home septic tanks have capacities ranging from 750 to 1,250 gallons. A 1000 gallon tank will most likely be required for a typical 3-bedroom home that is smaller than 2500 square feet in size.
How deep in the ground is a septic tank?
Your septic system is normally buried between four inches and four feet underground, depending on the climate.
Sizes of Septic Tanks & Shapes
Most septic tanks are built of fiberglass, plastic, or reinforced concrete, with certain exceptions. Metal tanks are also available, but because of their tendency to corrode quickly, they are not normally advised. Septic tanks are available in a variety of shapes, including rectangular, round, and oval, however the design of a septic tank does not normally alter its operation. When selecting a septic tank, the most critical consideration is ensuring that the tank is the appropriate size for your home’s needs.
Concrete Tank Construction
Concrete septic tanks are large and heavy, and their form is commonly rectangular. They’re often built in one of three ways: with a mid-seal, a top-seal, or a monolithic construction. Mid-seal tanks are made up of two sections that are bonded together with mastic sealant to form one unit. A top-seal tank is a one-piece tank with a concrete cover that is attached to the tank. Monolithic cast tanks are constructed in a factory as a single unit, making them more waterproof than other forms of concrete tanks, but they are also more expensive than other types of concrete tanks.
Fiberglass and Plastic Tanks
In circular or capsule-like designs, fiberglass and plastic tanks have a nearly impenetrable waterproof seal and are therefore ideal for use in the marine environment. They are more expensive than concrete units, but because these tanks are formed as a single piece, there are no seams, the tanks are lightweight, and they are more resistant to impact cracks than concrete tanks, according to Atanis Water Tank Co., Ltd. Although they are more expensive than concrete units,
A Range of Tank Sizes
Septic tank capacities are measured in gallons, and are determined by the quantity of sewage that the tank can contain in total. It is necessary for septic tanks to store at least two days’ worth of sewage from your residence in order for the solids to be adequately separated from the liquids before the liquids are allowed to enter the absorption area. The size of the tank is determined by the number of bedrooms in your home. Standard tank sizes are generally 1,000, 1,250, and 1,500 gallons, and they are sufficient for the majority of residences in the United States.
A four-bedroom home requires a tank with a minimum liquid capacity of 1,250 gallons, while a five-bedroom residence requires a tank with a minimum liquid capacity of 1,500 gallons.
Estimating Your Needed Tank Size
The size of the tank is computed using a straightforward formula, while other considerations, such as the soil type, must be taken into consideration. Therefore, it is important to have a professional analyze the site and your property in order to decide the optimal size of tank for your needs and requirements. According to the University of Missouri Extension, to obtain a sense of the minimum size required for your home, multiply 150 gallons each bedroom by two, and then double the total by two to account for the 48-hour retention time required.
Assuming your property has more than six bedrooms, or five bedrooms plus a hot tub, you would multiply 150 times 6, and the resultant figure (900) would be increased by two to give you a minimum liquid capacity of 1,800 gallons.
What Size Septic Tank Do I Need
The size of an underground septic tank is referred to as its total volume handling capacity in this article, and it will be discussed in further detail later in this article. For additional information on above-ground septic tanks and systems, see our page on above-ground septic tanks. The minimum septic tank capacity requirements are determined by a variety of variables. State, county, and/or city regulations may specify permitted tank sizes, as well as tank materials and installation.
The size of the septic tank will vary depending on whether it is intended for domestic or commercial usage; in this section, we will cover residential use.
Shortly stated, the required size of a septic tank will be determined by the following factors: (1) the specific septic system type; (2) local government requirements; (3) the compatibility of the ground geology; and (4) the anticipated volume of wastewater depending on the size of the residence.
However, this is not true.
Furthermore, plastic septic tanks will not corrode, are weatherproof, are waterproof, are less expensive, are lighter, and are easier to build.
1) The Specific Septic System Type
There are seven different types of septic tank systems, and the size of the tank required will vary depending on the system you choose. The scope of this article does not allow for a comprehensive discussion of each system type and its associated size requirements. We are referring to traditional gravity-fed anaerobic septic systems in this context when we say “system type.” The anaerobic septic system is the most prevalent type of septic system, and it is the one that most people think of when they imagine a septic tank.
- The following systems are available: conventional, gravity-fed, anaerobic systems
- Above-ground septic systems
- Pressure systems
- Anaerobic systems
- Mound systems
- Recirculating sand or gravel filters systems
- Bottomless sand filters systems
If your septic tank system is anything other than a traditional, anaerobic system, the instructions in this page may not be applicable in their entirety to your situation.
2) Local Government Regulations
The laws for septic tanks imposed by local governments vary greatly across the United States. In part, this is due to the significantly diverse soil geography and water features that exist from state to state and can even differ by a few miles in some cases. In order to determine the appropriate septic tank size and the best position on the land for installation, it is essential to consult with local government rules first. Take, for example, theWastewater Treatment Standards – Residential Onsite Systemsdocument from the New York State Department of Health, which provides a comprehensive informational overview of codes, rules, and regulations frequently promulgated by governing bodies, as well as common terminology and definitions in the industry.
3) Suitability of the Ground Geology
The subterranean soil type has a significant impact on the efficacy of the system and, consequently, the size of the septic tank. This topic is highly tied to the rules of the local government. In most cases, it is related to the standards and recommendations of a designated authority that regulates septic tank installations, which is typically the department of health. In order to determine whether or not the ground is suitable for a septic tank system, a trained specialist must come out to the prospective installation site and conduct a series of tests.
A perc test will assess whether or not the subterranean soil is capable of handling and filtering septic tank effluent in an appropriate manner.
Whether you are hiring an experienced professional or doing it yourself, it is your obligation to contact your local oversight agency and arrange for perc tests and/or ground area evaluations to be performed.
4) The Expected Volume of Wastewater
The typical amount of wastewater that will be generated and that the septic tank will be able to manage is the most essential factor in determining the size of the septic tank that is required. In a home with simply a septic system, all wastewater is disposed of in the septic tank unless a separate system for managing greywater is in place to handle the waste. In order to calculate and approximate these values for residential dwellings, business structures, and facilities, extensive study has been carried out.
Starting with a 1000-gallon septic tank for residential usage, the advice is to go from there.
Some experts propose adding an additional 250 gallons of septic tank capacity for each additional bedroom over three bedrooms.
This is frequently the case when considering the situation collectively for the entire household rather than individually.
This article has demonstrated that septic tank recommendations are extremely diverse and depend on a variety of factors like where you reside, local government rules, subterranean soil type, house size, and the amount of wastewater that your unique home is predicted to produce.
Minimum Septic Tank Capacity Table
For further information on the minimum septic tank capacity dependent on the number of residential bedrooms, please see the following table:
| Number of Bedrooms | Minimum Septic Tank Size | Minimum Liquid Surface Area | Drainfield Size |
|---|---|---|---|
| 2 or less | 1000 – 1500 Gallons | 27 Sq. Ft. | 800 – 2500 Sq. Ft. |
| 3 | 1000 – 2000 Gallons | 27 Sq. Ft. | 1000 – 2880 Sq. Ft. |
| 4 | 1250 – 2500 Gallons | 34 Sq. Ft. | 1200 – 3200 Sq. Ft. |
| 5 | 1500 – 3000 Gallons | 40 Sq. Ft. | 1600 – 3400 Sq. Ft. |
| 6 | 1750 – 3500 Gallons | 47 Sq. Ft. | 2000 – 3800 Sq. Ft. |
Take note of the following in relation to the table above:
- As defined by the State of New York, the Minimum Liquid Surface Area is the surface area given for the liquid by the tank’s width and length measurements. The range of Drainfield Sizes is depending on the kind of groundwater present. The State of Michigan provides the above-mentioned drainfield recommendations, which might vary greatly depending on local standards and terrain.
Additional Thought: Can a Septic Tank Be Too Big?
In the absence of consideration for cost, it is reasonable to ask: “Can a septic tank be too large?” The answer is a resounding nay. As long as the septic tank is placed appropriately, it is impossible for a septic tank to be too large; the only thing that can happen is that it is too little. According to the majority of suggestions, constructing a larger-capacity septic tank is frequently the safer and more preferable solution. The following are the reasons behind this:
- In the absence of consideration for cost, it is reasonable to wonder: “Can a septic tank be too large?” No, that is not the case. It is possible to have a septic tank that is too large, but this is only possible if the tank is placed appropriately. When it comes to septic tank installation, the majority of experts agree that establishing a bigger tank is the safest and more preferable alternative. This is due to a variety of factors, including:
Takeaways | What Size Septic Tank Do I Need
The septic tank size recommendations offered here are merely that: suggestions. They are built on a foundation of information gathered from government and academic sources. The actual size of the septic tank you require will vary depending on the factors discussed in this article. There is no “one-size-fits-all” solution when it comes to determining the appropriate septic tank size for your property. There is a great deal of variation depending on where you reside. With addition to providing a basic insight into the septic tank and system size that may be most suited to your application, the providedMinimum Septic Tank Capacity Tablecan also assist in cost estimations.
Before beginning any septic tank installation project, check and double-check with the state, city, or local county’s agency that is in charge of septic tanks, soil testing, and permissions.
If you’re searching for a chart of tank sizes, have a look at our page on the many sizes and quantities of septic tanks available.
They are available in both single chamber and double chamber designs.
Septic Tank Sizes Chart: Common Tank Capacities and Measurements
High density polyethylene, abbreviated HDPE, is the most often used material for modern septic tanks, with concrete being the second most common material. HDPE is a heavy-duty grade polyethylene that is used to manufacture a variety of items, including septic tanks, which are available in both underground and above-ground configurations. Because of the robustness and adaptability of HDPE, plastic septic tanks are available in a broad range of volume capacities and measurement measurements to suit any application.
Plastic septic tanks are less expensive than concrete tanks, they are easier to carry and install, they are more resistant to cracking and weathering, and they are available in a variety of forms, volumes, and sizes to satisfy the exact demands of every application.
Our septic tank sizes chart contains the most often used tank capacity and measurements, which should be of assistance. The chart contains the liquid surface area provided by the septic tank’s size, which may be used to assist in selecting the appropriate tank.
Underground Septic Tank Specifications Chart — Standard Septic Tanks
The following chart provides an overview of the requirements for conventional septic tanks.
| Volume (Gallons) | Dimensions (L x W x H) | Compartments | Liquid Surface Area (Sq. Ft.) | Manufacturer |
|---|---|---|---|---|
| 500 Gallons | 101″ L x 51″ W x 47″ H | 1 | 35.77 Sq. Ft. | Norwesco |
| 750 Gallons | 96″ L x 48″ W x 63″ H | 1 | 32.00 Sq. Ft. | Norwesco |
| 750 Gallons | 70″ L x 60″ W x 60″ H | 1 | 29.16 Sq. Ft. | Ace Roto Mold |
| 1000 Gallons | 102″ L x 60″ W x 63″ H | 1 | 42.5 Sq. Ft. | Norwesco |
| 1000 Gallons | 102″ L x 60″ W x 63″ H | 2 | 42.5 Sq. Ft. | Norwesco |
| 1000 Gallons | 101″ L x 60″ W x 60″ H | 1 | 42.08 Sq. Ft. | Ace Roto Mold |
| 1000 Gallons | 101″ L x 60″ W x 60″ H | 2 | 42.08 Sq. Ft. | Ace Roto Mold |
| 1250 Gallons | 116″ L x 55″ W x 70″ H | 1 | 44.30 Sq. Ft. | Norwesco |
| 1250 Gallons | 116″ L x 55″ W x 70″ H | 2 | 44.30 Sq. Ft. | Norwesco |
| 1250 Gallons | 118″ L x 58″ W x 72″ H | 1 | 47.53 Sq. Ft. | Ace Roto Mold |
| 1250 Gallons | 118″ L x 58″ W x 72″ H | 2 | 47.53 Sq. Ft. | Ace Roto Mold |
| 1500 Gallons | 135″ L x 55″ W x 70″ H | 1 | 51.56 Sq. Ft. | Norwesco |
| 1500 Gallons | 135″ L x 55″ W x 70″ H | 2 | 51.56 Sq. Ft. | Norwesco |
| 1500 Gallons | 137″ L x 58″ W x 72″ H | 1 | 55.18 Sq. Ft. | Ace Roto Mold |
| 1500 Gallons | 137″ L x 58″ W x 72″ H | 2 | 55.18 Sq. Ft. | Ace Roto Mold |
| 2000 Gallons | 126″ L x 98″ W x 51″ H | 1 | 85.75 Sq. Ft. | Norwesco |
| 2500 Gallons | 159″ L x 99″ W x 51″ H | 1 | 109.31 Sq. Ft. | Norwesco |
| 3525 Gallons | 211″ L x 102″ W x 51″ H | 1 | 149.46 Sq. Ft. | Norwesco |
| 5025 Gallons | 211″ L x 102″ W x 73″ H | 1 | 149.46 Sq. Ft. | Norwesco |
| 10000 Gallons | 356″ L x 101″ W x 107″ H | 2 | 249.69 Sq. Ft. | Norwesco |
Underground Septic Tank Specifications Chart — Low Profile Septic Tanks
The low profile septic tank parameters shown in the accompanying chart provide a general overview.
| Volume | Dimensions (L x W x H) | Compartments | Liquid Surface Area (Sq. Ft.) | Manufacturer |
|---|---|---|---|---|
| 500 Gallons | 97″ L x 48″ W x 42″ H | 1 | 32.33 Sq. Ft. | Norwesco |
| 750 Gallons | 92″ L x 60″ W x 51″ H | 1 | 38.33 Sq. Ft. | Norwesco |
| 750 Gallons | 92″ L x 60″ W x 51″ H | 2 | 38.33 Sq. Ft. | Norwesco |
| 1000 Gallons | 127″ L x 60″ W x 51″ H | 1 | 52.92 Sq. Ft. | Norwesco |
| 1000 Gallons | 127″ L x 60″ W x 51″ H | 2 | 52.92 Sq. Ft. | Norwesco |
| 1250 Gallons | 157″ L x 60″ W x 51″ H | 1 | 65.42 Sq. Ft. | Norwesco |
| 1250 Gallons | 157″ L x 60″ W x 51″ H | 2 | 65.42 Sq. Ft. | Norwesco |
| 1500 Gallons | 157″ L x 69″ W x 51″ H | 1 | 75.23 Sq. Ft. | Norwesco |
| 1500 Gallons | 157″ L x 69″ W x 51″ H | 2 | 75.23 Sq. Ft. | Norwesco |
Underground Septic Tank Specifications Chart — Septic Pump Tanks
The following chart provides an overview of the specs for septic pump tanks.
| Volume (Gallons) | Dimensions (L x W x H) | Liquid Surface Area (Sq. Ft.) | Manufacturer |
|---|---|---|---|
| 200 Gallons | 47″ L x 47″ W x 56″ H | 15.34 Sq. Ft. | Norwesco |
| 225 Gallons | 47″ L x 47″ W x 56″ H | 15.34 Sq. Ft. | Norwesco |
| 300 Gallons | 48.5″ L x 48.5″ W x 53″ H | 16.34 Sq. Ft. | Snyder |
| 300 Gallons | 54″ L x 54″ W x 55″ H | 20.25 Sq. Ft. | Ace Roto Mold |
| 300 Gallons | 54″ L x 54″ W x 54″ H | 20.25 Sq. Ft. | Norwesco |
| 300 Gallons FL Approved | 54″ L x 54″ W x 54″ H | 20.25 Sq. Ft. | Norwesco |
| 500 Gallons | 60″ L x 60″ W x 63″ H | 25.00 Sq. Ft. | Snyder |
| 500 Gallons | 63″ L x 63″ W x 74″ H | 27.56 Sq. Ft. | Ace Roto Mold |
| 500 Gallons | 64″ L x 64″ W x 67″ H | 28.44 Sq. Ft. | Norwesco |
| 525 Gallons FL Approved | 64″ L x 64″ W x 67″ H | 28.44 Sq. Ft. | Norwesco |
Above Ground Septic Tank Specifications Chart – Septic Holding Tanks
The following chart provides an overview of the many types of above-ground septic tanks that are currently available, as well as their specs.
| Volume (Gallons) | Dimensions (L x W x H) | Liquid Surface Area (Sq. Ft.) | Manufacturer |
|---|---|---|---|
| 250 Gallons | 69″ L x 49″ W x 19.5″ H | 23.48 Sq. Ft. | NTO |
| 250 Gallons | 84″ L x 40″ W x 17″ H | 23.33 Sq. Ft. | Quadel |
| 300 Gallons | 95″ L x 56″ W x 16″ H | 36.94 Sq. Ft. | Ace Roto Mold |
| 300 Gallons | 95″ L x 56″ W x 16″ H | 36.94 Sq. Ft. | NTO |
| 350 Gallons | 88″ L x 44″ W x 25″ H | 26.88 Sq. Ft. | Quadel |
| 440 Gallons | 91″ L x 72″ W x 16″ H | 45.50 Sq. Ft. | NTO |
| 500 Gallons | 130″ L x 52″ W x 22″ H | 46.94 Sq. Ft. | Norwesco |
| 1000 Gallons | 136″ L x 91″ W x 20″ H | 85.94 Sq. Ft. | NTO |
Due to the possibility of change as well as variation in pricing as a result of sales prices, septic tank costs are not included in these table calculations. Please do not hesitate to contact us if you require any assistance or have any concerns regarding septic tank specifications, shipping, modifications, or anything else. We at the National Tank Outlet are always here to assist you with your liquid handling and transportation requirements. Alek Eccles is a technical writer and professional content developer that works in the technology industry.
Alek’s goal is to promote awareness of technological, chemical, and biological industries, systems, and ideas, as well as rainwater harvesting, plastics/thermoplastics, and containers used for general storage, handling, and transportation, among other things.
Septic Tank Size: What Size Septic Tank Do You Need?
Septic tanks are used for wastewater disposal and are located directly outside your home. Private wastewater management is becoming increasingly popular in the United States, with more than 30 percent of newly constructed residences incorporating on-site wastewater management. Do you require septic tank installation and are unsure of the amount of septic tank you require? When establishing a septic tank, the most important element to consider is the type and size of septic tank that you will be installing.
A number of factors influence the size of a septic tank, which are discussed in this article.
Basics of Septic Tanks
Your septic system is a self-contained chamber that is designed to retain the wastewater generated by your home. A septic system is comprised of two major components: the soil absorption area or drain, and the holding tank. Septic tanks absorb solid waste when wastewater is discharged into them, resulting in the formation of an asludge layer at the septic tank’s base. A layer of soap residue, grease, and oil forms on the top of the water. The effluent or wastewater is contained within the intermediate layer.
To discover more about how a septic tank works, check out our page that goes into further detail on how a septic tank functions.
The Main Types of Septic Tanks
Before you start thinking about septic tank sizes, it’s important to understand the many types of septic tanks that exist.
- Septic tanks made of fiberglass
- Septic tanks made of plastic
- Septic tanks made of concrete
Concrete septic tanks are the most prevalent variety, but since they are so massive, you will need big and expensive equipment to build them. Fiberglass and plastic septic tanks are lighter than concrete and are therefore more suited for difficult-to-reach and distant locations. Before purchasing a septic tank, you should check with your local building department to learn about the rules and guidelines governing private wastewater management. You may also be interested in:Do you have a septic tank?
Why Septic Tank Sizes is Important
Due to its weight, the most frequent form of septic tank is concrete. However, because they are heavy, installing them requires large and expensive equipment. The reduced weight of fiberglass and plastic septic tanks makes them ideal for use in difficult-to-reach or rural locations. Consult your local building department for information on private wastewater management rules and codes before making a purchase decision. Do you have a septic tank? Also read this:
What Determines Septic Sizes?
Here are some of the elements that influence septic tank sizes; keep them in mind when making your purchase to ensure that you get the most appropriate septic tank for your property.
Consider Your Water Usage
The most accurate and practical method of estimating the appropriate septic tank size for your property is to calculate the quantity of water you use on a regular basis. The size of the septic tank required is determined by the amount of water that can be held in it before being drained into the soil absorption field. In many places of the United States, the smallest capacity of septic tank that may be installed is 1,000 gallons or less. The following are the suggested septic tank sizes for your household, which are based on your household’s entire water use.
- A septic tank with a capacity of 1,900 gallons will handle less than 1,240 gallons per day
- A septic tank with a capacity of 1,500 gallons will handle less than 900 gallons per day. A septic tank with a capacity of 1,200 gallons is required for less than 700 gallons per day
- A septic tank with a capacity of 900 gallons is required for less than 500 gallons per day.
Consider the Size of Your Property
Another factor to consider when determining the most appropriate septic tank size for your home is the square footage of your home. The size of your home will determine the size of the septic tank you will require. For example, a dwelling with less than 1,500 square feet typically requires a tank that holds 750 to 1,000 gallons. On the other side, a larger home of around 2,500 square feet will require a larger tank, one that is more than the 1,000-gallon capacity.
The Number of Bedrooms Your Property Has
An additional issue to consider is the amount of bedrooms in your home, which will influence the size of your septic tank. The size of your septic tank is proportional to the number of bedrooms on your home. The following table lists the appropriate septic tank sizes based on the number of bedrooms.
- In general, a 1-2 bedroom house will require a 500 gallon septic tank
- A 3 bedroom house will demand 1000 gallon septic tank
- A 4 bedroom house will require 1200 gallon septic tank
- And a 5-6 bedroom house would require a 1500 gallon septic tank.
The Number of Occupants
In general, the greater the number of people that live in your home, the larger your septic tank must be. In the case of a two-person household, a modest septic tank will be necessary. If your house has more than five tenants, on the other hand, you will want a larger septic tank in order to handle your wastewater more effectively and hygienically. When determining what size septic tank to purchase, it is important to remember that the size of your septic tank determines the overall effectiveness of your septic system.
As a result, it is critical that you examine septic tank sizes in order to pick the most appropriate alternative for your property in order to avoid these difficulties. Please contact us to determine the optimal septic system size for your North Atlanta, GA house.
Septic Tank Design
In this civil engineering tutorial, you will learn how to build a septic tank without the need of a drawing or the use of precise measurements. The design is completed in accordance with the specified dimensions. The following are the step-by-step building instructions:-
- Excavation work
- PCC work
- Wall building over PCC
- Brickwork
- Construction of an RCC slab with a thickness of 5″
- Installation of a tank cover
The following dimensions are taken into consideration when doing the calculation:-
- In this case, the standard length of a septic tank (L) should be assumed to be 9 feet 9 inches or 9.75 feet
- The standard width of a septic tank (B) should be taken to be 6 feet 3 inches or 6.25 feet
- And the standard height of a septic tank (D) should be taken to be 5 feet 9 inches or 5.75 feet.
- It is recommended that the thickness of outside walls be 9 inches or 0.75 feet, and that the thickness of inner walls be 4.5 inches or 0.375 feet. It is assumed that the ratio of PCC is 1:2:4 with a 4 inch thickness
- The ratio of RCC slab is 1:2:4 with a 5 inch thickness.
- The diameter of the cover (which should be spherical) should not exceed 2 feet in diameter. It is recommended that the diameter of the square cover be 2 x 2 feet. The hole in the wall (to be used to clear the obstruction) should be 1.5 feet in diameter. It is recommended that both the inlet and output pipes have a minimum diameter of 4 inches.
How Big of a Septic Tank Do I Need?
The size and kind of tank required for a new septic system are the two most important considerations to make before beginning the installation process. Private sewage disposal is becoming increasingly popular in the United States, with 33 percent of newly constructed residences choosing for on-site wastewater treatment as part of their construction. Septic tank systems, in conjunction with a soil absorption system, or a drain field, are the least costly way of treating residential wastewater currently available on the market.
- The typical size of a home septic tank is from 750 gallons to 1,250 gallons in capacity.
- The system is made up of two major components: the tank and the drain, often known as the soil absorption field or drain field.
- Oil, grease, and soap residue combine to form the scum layer on the surface of the water.
- With each filling of the tank, the effluent drains out of the tank and into the drain field, where it is absorbed by the earth.
- Septic tanks are commonly utilized in residential construction and can be classified into three categories.
- Polyethylene and fiberglass are one-piece products that are significantly lighter than steel.
- In order to determine whether or not you need a septic tank system, check with your local building department to see what laws and requirements apply to onsite wastewater treatment.
- The square footage of the property, the number of bedrooms, and the number of people who will be living there are all important considerations.
- Septic tanks for one and two bedroom homes that are less than 1,500 square feet and 1,000 gallon septic tanks for three bedroom homes that are less than 2,500 square feet are recommended.
- The figures listed above are only estimates.
- Before acquiring a septic tank system, speak with a professional plumbing contractor who is licensed in your region about the many septic tank alternatives that are available to you.
Get in touch with the Pink Plumber right away if you have any queries or concerns about your septic tank. Image courtesy of Flickr OUR EXPERT PLUMBERS ARE AVAILABLE TO HELP YOU.
Standard Sizes of Septic Tanks
What size should a septic tank be is a matter of debate. It is critical that septic tanks are large enough to accommodate the quantity of individuals who will be using them. What is causing my septic tank to be overflowing? There are a variety of factors that might cause a septic tank to begin overflowing and overflowing. In this section, we will discuss why a septic tank might become overflowing, how a septic tank works, and how to calculate the size of a septic tank you will require. The sizes of conventional septic tanks in both the United Kingdom and the United States are listed at the bottom of this page.
- Biological Action in a Septic Tank
- Septic Tank Design and Construction
- Septic System Care
- Blocked Toilets and Drains
- Blocked Sewer Lines
Why is my Septic tank full?
Last week, I received an intriguing query, which is as follows: “I have a septic tank that isn’t working properly. The tank is rather huge, measuring around 5 by 2 by 1.5 feet, but it fills quickly – in the wet, it must be emptied out often, perhaps every two weeks, but in the dry, it fills much more slowly. Obviously, groundwater is infiltrating, but the question is what should be done about it.” The average septic tank should not full up and, as a rule of thumb, should only need to be pumped out once every five years or so if everything is running regularly.
- To begin, determine whether the tank has previously been functioning effectively or whether it has required regular pumping out in the past.
- The fact that the tank fills more quickly during the rainy season is a bit of a giveaway in the introductory question, and it lends credence to the writer’s suspicions that ground water is entering the tank.
- If there is extra water in the tank, it is possible that drainage water has been linked to the tank or that surface water is flowing into the tank through some other means.
- In addition to the difficulty of the tank filling up when it rains, the drainage water that enters the tank is a health hazard to the environment.
- If the tank is erected in a clay location (rice fields are bordered with clay), it is possible that the entire area where the tank is located becomes saturated with water that cannot be removed by drainage.
- It’s possible that the tank has a breach in it, allowing groundwater to seep in from the surrounding earth.
- Because the water table is seldom higher than the top of a septic tank, water would be more likely to flow out of a damaged tank than into it in most situations.
- In some nations, there are rigorous laws surrounding what is known as the “soak field,” which is the area into which septic tanks discharge their wastewater.
- This “blind eye” approach toward the discharge pipes of septic tanks is most likely the primary explanation for the high number of bowel disorders linked with the Indonesian island of Bali.
In this case, it’s possible that silt in the primary chamber of the tanks has risen to a level higher than the pipe, causing it to become impassable. This is uncommon, although it is conceivable, if the tank has been emptied and refilled.
Septic tank design
Septic tanks should contain at least two chambers (and frequently three) in order to function properly. The first chamber is responsible for the settling of sediments to the bottom of the tank as sludge. Bacterial activity begins to break down the sludge and waste water in the treatment plant. The scum that forms as a result of the bacterial activity is stuck on the surface. Through an internal conduit, semi-processed waste may be sent from the first chamber to the second chamber, where the bacterial action continues to break down the waste water even more.
If the pipe connecting the first and second chambers becomes clogged, the first chamber will overflow into the second chamber.
How to find the cause of the problem
So, to sum it all together. 1. Begin by making sure that the septic tank is indeed full. If the waste line to the tank becomes clogged, waste will back up into the showers and toilets, and the septic tank will not be able to hold its full capacity. 2. Next, determine whether drainage or surface water is entering the tank and take actions to prevent this from happening. Some exceptionally intelligent individual may have linked drainage pipes into the septic system, and you may need to double-check for this possibility.
- Third, inspect the outflow from the tank.
- Check to see that the outflow pipe from the tank is lower than the intake pipe as well as the tank itself.
- If none of the above measures are successful, it will be required to dig out and get access to the tank.
- A crack in the tank will require professional repair, and you should obtain technical assistance on how to do it.
Calculating Septic Tank Size – How Big?
Because of this entire conversation, the topic of how huge a septic tank should be arises. As a matter of course, this is reliant on how much trash is generated, and it is directly tied to how much water we consume for “internal” activities such as washing our faces and hair and cleaning our teeth as well as using the toilet and bathing. Obviously, while evaluating water use, we must take into account variances in lifestyle. Some people tend to consume a lot of water, while others prefer to bathe rather than shower, and persons in warmer areas tend to shower more frequently.
Further research has discovered that the more prosperous we get, the more water we squander. To assist you in determining your water use, you can visit the water consumption calculator on the website at
American Calculation (compiled from several sources)
0.95 cubic metres in total, plus 0.95 cubic metres for each additional bedroom. So:
| No. Bedrooms | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Tank Size in Cubic Metres | 1.9 | 2.85 | 3.8 | 4.75 | 5.7 |
British Calculation (from the British Standard BS 6297)
2,000 litres (2 cubic metres) plus 180 litres per person is the maximum amount. So:
| No people | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Tank Size in Cubic Metres | 2.18 | 2.36 | 2.54 | 2.72 | 2.9 | 3.08 | 3.26 | 3.44 | 3.62 | 3.8 |
- Two thousand and one hundred and eighty litres (2 cubic metres) + 180 litres per person So:
Phil Wilson is the owner of the copyright as of August 2011. This article, or any part of it, may not be duplicated or reproduced without the express consent of the author or owner of the copyright.
Standard Septic Systems
When it comes to treating residential wastewater, a regular wastewater system combined with a soil absorption system is the most cost-effective technique currently available. However, in order for it to function correctly, you must select the appropriate septic system for your home size and soil type, and you must keep it in good working order on a regular basis.
What size septic tank do I need?
Septic tank size requirements are determined by the number of bedrooms in a house, the number of people who live there, the square footage of a house, and whether or not water-saving gadgets are installed. If you want to obtain a general sense of what size septic tank your home requires, look at the table below.
| Bedrooms | Home Square Footage | Tank Capacity |
| 1 or 2 | Less than 1,500 | 750 |
| 3 | Less than 2,500 | 1,000 |
| 4 | Less than 3,500 | 1,250 |
| 5 | Less than 4,500 | 1,250 |
| 6 | Less than 5,500 | 1,315 |
How often should my tank be pumped?
A regular pumping of the tank is required to maintain your system operating properly and treating sewage efficiently. Sludge collects at the bottom of the septic tank as a result of the usage of the septic system. Because of the rise in sludge level, wastewater spends less time in the tank and solids have a greater chance of escaping into the absorption region. If sludge collects for an excessive amount of time, there is no settling and the sewage is directed directly to the soil absorption region, with no treatment.
- You can find out how often you should get your tank pumped by looking at the table below.
- If you fail to maintain the tank for an extended period of time, you may be forced to replace the soil absorption field.
- Solids can enter the field if the tank is not pumped on a regular basis.
- Wet soils that have been saturated by rains are incapable of receiving wastewater.
Other maintenance
Another maintenance activity that must be completed on a regular basis to protect the system from backing up is to clean the effluent filter, which is located in the tank’s outflow tee and is responsible for additional wastewater filtration. This filter eliminates extra particulates from the wastewater and prevents them from being clogged in the absorption field, which would cause the absorption field to fail prematurely.
You may clean the filter yourself by spraying it with a hose, or you can have your maintenance provider clean the filter for you if necessary.
Two critical components
A septic tank and a soil absorption system are the two primary components of a standard treatment system.
Tank
The septic tank is an enclosed, waterproof container that collects and treats wastewater, separating the particles from the liquid. It is used for primary treatment of wastewater. It works by retaining wastewater in the tank and letting the heavier particles (such as oil and greases) to settle to the bottom of the tank while the floatable solids (such as water and sewage) rise to the surface. The tank should be able to store the wastewater for at least 24 hours in order to provide time for the sediments to settle.
Up to 50% of the particles stored in the tank decompose, with the remainder accumulating as sludge at the tank bottom, which must be cleaned on a regular basis by pumping the tank out.
Drainfield
Ultimately, the soil absorption field is responsible for the final treatment and distribution of wastewater. Traditional systems consist of perforated pipes surrounded by media such as gravel and chipped tires, which are then coated with geo-textile fabric and loamy soil to create a permeable barrier. This method depends mainly on the soil to treat wastewater, where microorganisms assist in the removal of organic debris, sediments, and nutrients that have been left in the water after it has been treated.
As the water moves through the soil, the mat slows its passage and helps to prevent the soil below the mat from being saturated.
The grass that grows on top of the soil absorption system takes use of the nutrients and water to flourish as well.
Septic tank types
There are three primary types of septic tanks used for on-site wastewater treatment: cisterns, septic tanks, and septic tanks with a pump.
- Concrete septic tanks are the most popular type of septic tank. Fiberglass tanks – Because they are lightweight and portable, they are frequently used in remote or difficult-to-reach sites. Lightweight polyethylene/plastic tanks, similar to fiberglass tanks, may be transported to “difficult-to-reach” sites since they are one-piece constructions.
It is necessary for all tanks to be waterproof in order to prevent water from entering as well as exiting the system.
Factors in septic maintenance
A critical consideration in the construction of a septic tank is the link between the amount of surface area it has, the amount of sewage it can hold, the amount of wastewater that is discharged, and the rate at which it escapes. All of these factors influence the effectiveness of the tank as well as the quantity of sludge it retains. The bigger the liquid surface area of the tank, the greater the amount of sewage it can hold. As more particles accumulate in the tank, the water level in the tank grows shallower, necessitating a slower discharge rate in order to give the sludge and scum more time to separate from one another.
An aperture must be utilized on the tank lid if it is more than 12 inches below the soil surface, and a riser must be used on the openings in order to bring the lid to within 6 inches of the soil surface.
In most cases, the riser may be extended all the way to the ground surface and covered by a sturdy lid. It is quite simple to do maintenance on the tank thanks to these risers.
Soil types
There are three types of soil textures: sand, silt, and clay, and each has an impact on how quickly wastewater filters into the soil (a property known as hydraulic conductivity) and how large an absorption field is required. Sand transports water more quickly than silt, which transfers water more quickly than clay. According to Texas laws, these three soil textures are subdivided into five soil kinds (Ia, Ib, II, III, IV). Sandy soils are classified as soil type I, whereas clay soils are classified as soil type IV.
The Hydraulic Loading, which is the quantity of effluent applied per square foot of trench surface, is also significant in the design.
For this reason, only nonstandard drain fields are suitable for use in clay soils due to the poor conductivity of clay soils.
The Texas A&M University System’s Agricultural Communications department.
L-5227 was published on April 10, 2000.
