Modern septic tanks are most frequently made from either concrete or high density polyethylene, abbreviated HDPE. HDPE is a heavy duty grade plastic used to make many products, including septic tanks in both underground and above ground tank styles. Due to the strength and versatility of HDPE, plastic septic tanks come in a wide range of volume capacities and measurement dimensions.
Contrary to some thoughts, HDPE plastic septic tanks make excellent choices for onsite waste management systems for both homes and businesses. Compared to concrete tanks, plastic septic tanks cost less, are easier to transport and install, are more resistant to cracking and weathering, and come in many shapes, volumes, and sizes to meet any application’s specific needs.
Due to the wide range of available options for underground and above ground septic tanks, shopping and comparing specifications can be challenging and time-consuming. To help, we have compiled a septic tank sizes chart of the most common tank capacities and measurements. The chart includes the liquid surface area supplied by the septic tank’s dimensions to help select the right tank.
Underground Septic Tank Specifications Chart — Standard Septic Tanks
The following chart is an overview of standard septic tank specifications.
| 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 following chart is an overview of low profile septic tank specifications.
| 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 is an overview of septic pump tank specifications.
| 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 is an overview of available above ground septic tanks and their specifications.
| 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 |
Note, septic tank prices are not listed in these tables as they may be subject to change as well as fluctuation due to sales prices. If you need any assistance or have questions regarding septic tank specifications, shipping, customizations or more, do not hesitate to contact us. The National Tank Outlet is always ready to assist with all liquid handling and transport needs.
