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Plastic Septic Tanks See list below.
Plastic-Mart's septic tanks for sale are long-lasting, are easy to install, and are cost-effective. As one of the top septic tank suppliers, we offer a wide range of plastic septic holding tanks such as 500 gallons or 1000 gallon storage containers. Today's technology and engineering involved with making a plastic septic tank, has created a product built to last.
Plastic Septic Tanks are designed for both residential and commercial use. Plastic Septic Tanks may NOT be used for storage of chemicals intended for human consumption, if needed see the below ground food grade water cistern tanks.
Browse through our septic tanks and septic tank accessories and purchase yours today!
Types of residential and commercial uses for plastic septic tanks:
- Outhouses
- Trailers
- RV parks
- Homes
- Cottages
- Portable construction buildings
Plastic Septic Tanks vs. Concrete
Plastic holding tanks and concrete tanks have multiple, significant differences.
Plastic septic tank installation is less complicated and can be stored in a wide variety of places. Septic tanks constructed by polyethylene resins are less susceptible to cracking too.
Concrete septic tanks are more expensive, crack easily, and can be challenging to repair.
The Advantages of Double Compartment Poly Septic Tanks
Dual compartment septic holding tanks provide more storage for waste which means that you do not have to empty the tank as often as a single poly septic tank.
Double compartment plastic septic tanks provide an additional area for sludge and liquid. The partition opening allows for solids and liquids to flow into the second area.
When the first compartment of a dual holding septic tank is filled to the top, the waste begins to flow into the second compartment. Solids then have more time to settle. With our double compartment septic tanks for sale, you save more time and more money!
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| Name | Capacity | Size | Part Number | Price |
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200 Gallon Plastic Septic Pump Tank (43745) |
200 Gallons |
47" dia x 56"H |
N-43745 | $486.00 |
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200 Gallon Plastic Septic Pump Tank (Austin TX)
Ships In 48 Hours |
200 Gallons |
47" dia x 56"H |
9504-N-43745 | $486.00 |
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300 Gallon Sphere Pump Tank (41319)
Ships In 48 Hours |
300 Gallons |
54" dia x 54"H |
N-41319 | $677.00 |
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300 Gallon Sphere Pump Tank - Nonplumbed |
300 Gallons |
48-1/2" Dia. x 53"H |
SII-5260000W94201 | $689.00 |
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300 Gallon Plastic Septic Pump Tank |
300 Gallons |
54"dia. x 56"H |
A-AST-0300-1 | $589.00 |
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300 Gallon Plastic Septic Pump Tank |
300 Gallons |
54"dia. x 56"H |
A-AST-0300-1R | $431.00 |
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300 Gallon Sphere Pump Tank - Preplumbed |
300 Gallons |
48.5"L x 48.5"W x 53"H |
SII-ST11S | $873.00 |
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300 Gallon Sphere Pump Tank - Preplumbed
Ships In 48 Hours (*Restricted) |
300 Gallons |
48.5"L x 48.5"W x 53"H |
9525-SII-ST11S | $873.00 |
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500 Gallon Low Profile Plastic Septic Tank
Ships In 48 Hours |
500 Gallons |
97" L x 48" W x 42" H |
N-43522 | $957.00 |
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500 Gallon Low Profile Septic Tank (Austin TX)
Ships In 48 Hours |
500 Gallons |
97" L x 48" W x 42" H |
9504-N-43522 | $957.00 |
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500 Gallon Low Profile Septic Tank (Houston TX)
Ships In 48 Hours |
500 Gallons |
97" L x 48" W x 42" H |
9513-N-43522 | $957.00 |
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500 Gallon Low Profile Septic Tank (San Antonio TX)
Ships In 48 Hours |
500 Gallons |
97" L x 48" W x 42" H |
9514-N-43522 | $957.00 |
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500 Gallon Low Profile Septic Tank (Oklahoma)
Ships Soon |
500 Gallons |
97" L x 48" W x 42" H |
9539-N-43522 | $957.00 |
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500 Gallon Sphere-Pump/Dosing Tank (40785) |
500 Gallons |
64" dia. x 67"H |
N-40785 | $897.00 |
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525 Gallon Low Profile Spherical Pump Tank |
525 Gallons |
64"L x 64"W x 67"H |
N-44831 | $950.00 |
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500 Gallon Plastic Septic Tank - 1 Compartment |
500 Gallons |
101" L x 51" W x 47" H |
N-41320 | $962.00 |
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500 Gallon Plastic Septic Pump Tank |
500 Gallons |
63"dia. x 74"H |
A-AST-0500-1 | $766.00 |
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500 Gallon Sphere Pump Tank - Nonplumbed |
500 Gallons |
60" Dia. x 63"H |
SII-PT2S | $775.00 |
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500 Gallon Sphere Tank - Preplumbed |
500 Gallons |
60"L x 60"W x 63"H |
SII-ST21S | $935.00 |
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750 Gallon 2 Compartment NexGen Septic Tank (IAPMO) |
750 Gallons |
92" L x 60" W x 51" H |
N-44510 | $1,675.00 |
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750 Gallon Septic Tank - 1 Compartment / 2 Manholes |
750 Gallons |
96" L x 48" W x 63" H |
N-41814 | $1,545.00 |
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750 Gallon One Compartment Plastic Septic Tank |
750 Gallons |
70"L x 60"W x 60"H |
A-AST-0750-1 | $1,023.00 |
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750 Gallon 1 Compartment Plastic Septic Tank (Loose Plumbing) |
750 Gallons |
92" L x 60" W x 51" H |
N-43495 | $1,415.00 |
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750 Gallon 1 Compartment NexGen Septic Tank (Loose Plumbing) |
750 Gallons |
92" L x 60" W x 51" H |
SII-43495 | $1,470.00 |
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750 Gallon 1 Compartment Plastic Septic Tank (Preplumbed) |
750 Gallons |
92" L x 60" W x 51" H |
N-43520 | $1,640.00 |
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750 Gallon 2 Compartment Plastic Septic Tank (Loose Plumbing) |
750 Gallons |
92" L x 60" W x 51" H |
N-43499 | $1,515.00 |
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750 Gallon 2 Compartment NexGen Septic Tank |
750 Gallons |
92" L x 60" W x 51" H |
SII-43499 | $1,579.00 |
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750 Gallon 2 Compartment NexGen Septic Tank (IAPMO)
Ships In 48 Hours (*Restricted) |
750 Gallons |
92" L x 60" W x 51" H |
9525-SII-44510 | $1,619.00 |
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750 Gallon 2 Compartment Septic Tank (Preplumbed)
Ships Soon |
750 Gallons |
92" L x 60" W x 51" H |
N-43521 | $1,693.00 |
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1000 Gallon 2 Compartment NexGen Septic Tank (IAPMO) |
1000 Gallons |
127" L x 60" W x 51" H |
N-44482 | $1,805.00 |
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1000 Gallon Plastic Septic Tank - 1 Compartment |
1000 Gallons |
102" L x 60" W x 58" H |
N-41718 | $1,619.00 |
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1000 Gallon Plastic Septic Tank - 1 Compartment |
1000 Gallons |
101"L x 60"W x 60"H |
A-AST-1000-1 | $1,425.00 |
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1000 Gallon Plastic Septic Tank - 2 Compartment |
1000 Gallons |
102" L x 60" W x 58" H |
N-41720 | $1,738.00 |
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1000 Gallon Two Compartment Plastic Septic Tank |
1000 Gallons |
101"L x 60"W x 60"H |
A-AST-1000-2 | $1,647.00 |
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1000 Gallon 1 Compartment Plastic Septic Tank (Loose Plumbing) |
1000 Gallons |
127" L x 60" W x 51" H |
N-42405 | $1,504.00 |
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1000 Gallon 1 Compartment NexGen Septic Tank |
1000 Gallons |
127" L x 60" W x 51" H |
SII-42405 | $1,592.00 |
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1000 Gallon 1 Compartment Plastic Septic Tank (Preplumbed) |
1000 Gallons |
127" L x 60" W x 51" H |
N-43496 | $1,765.00 |
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1000 Gallon 2 Compartment Plastic Septic Tank (Loose Plumbing) |
1000 Gallons |
127" L x 60" W x 51" H |
N-43517 | $1,529.00 |
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1000 Gallon 2 Compartment Plastic Septic Tank (Preplumbed)
Ships Soon |
1000 Gallons |
127" L x 60" W x 51" H |
N-42406 | $1,809.00 |
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1000 Gallon 2 Compartment Plastic Septic Tank (Preplumbed)
Ships In 48 Hours |
1000 Gallons |
127" L x 60" W x 51" H |
9513-N-42406 | $1,809.00 |
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1000 Gallon 2 Compartment Plastic Septic Tank (Preplumbed)
Ships In 48 Hours |
1000 Gallons |
127" L x 60" W x 51" H |
9514-N-42406 | $1,809.00 |
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1250 Gallon 2 Compartment NexGen Septic Tank (IAPMO) |
1250 Gallons |
157" L x 60" W x 51" H |
N-44483 | $2,096.00 |
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1250 Gallon Plastic Septic Tank - 2 Compartment |
1250 Gallons |
116" L x 55" W x 70" H |
N-41744 | $2,120.00 |
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1250 Gallon 1 Compartment Plastic Septic Tank (Loose Plumbing) |
1250 Gallons |
157" L x 60" W x 51" H |
N-43519 | $1,958.00 |
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1250 Gallon 1 Compartment NexGen Septic Tank |
1250 Gallons |
157" L x 60" W x 51" H |
SII-43519 | $2,025.00 |
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1250 Gallon 1 Compartment Plastic Septic Tank (Preplumbed) |
1250 Gallons |
157" L x 60" W x 51" H |
N-43497 | $2,207.00 |
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1250 Gallon 2 Compartment Plastic Septic Tank (Loose Plumbing) |
1250 Gallons |
157" L x 60" W x 51" H |
N-43503 | $2,090.00 |
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1250 Gallon 2 Compartment Plastic Septic Tank (Preplumbed) |
1250 Gallons |
157" L x 60" W x 51" H |
N-43501 | $2,346.00 |
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1500 Gallon 2 Compartment NexGen Septic Tank (IAPMO) |
1500 Gallons |
157" L x 69" W x 51" H |
N-44484 | $2,485.00 |
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1500 Gallon Plastic Septic Tank - 1 Compartment |
1500 Gallons |
135" L x 55" W x 70" H |
N-41758 | $2,427.00 |
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1500 Gallon Bruiser Septic Tank - 2 Compartment |
1500 Gallons |
135" L x 55" W x 70" H |
N-41772 | $3,224.00 |
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1500 Gallon Plastic Septic Tank - 2 Compartment |
1500 Gallons |
135" L x 55" W x 70" H |
N-41760 | $2,590.00 |
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1500 Gallon 1 Compartment Plastic Septic Tank (Loose Plumbing) |
1500 Gallons |
157" L x 69" W x 51" H |
N-43518 | $2,310.00 |
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1500 Gallon 1 Compartment NexGen Septic Tank |
1500 Gallons |
157" L x 69" W x 51" H |
SII-43518 | $2,398.00 |
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1500 Gallon 1 Compartment Plastic Septic Tank (Preplumbed) |
1500 Gallons |
157" L x 69" W x 51" H |
N-43498 | $2,587.00 |
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1500 Gallon 2 Compartment Plastic Septic Tank (Loose Plumbing) |
1500 Gallons |
157" L x 69" W x 51" H |
N-43504 | $2,472.00 |
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1500 Gallon Norwesco 2 Compartment Septic Tank |
1500 Gallons |
135"L x 55"W x 70"H |
N-44481 | $2,478.00 |
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1500 Gallon Norwesco 2 Compartment Septic Tank |
1500 Gallons |
135"L x 55"W x 70"H |
N-44480 | $2,452.00 |
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1500 Gallon 2 Compartment Plastic Septic Tank (Preplumbed) |
1500 Gallons |
157" L x 69" W x 51" H |
N-43502 | $2,754.00 |
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1500 Gallon 2 Compartment Plastic Septic Tank (Preplumbed)
Ships In 48 Hours |
1500 Gallons |
157" L x 69" W x 51" H |
9514-N-43502 | $2,754.00 |
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2000 Gallon Underground Holding Tank |
2000 Gallons |
126" L x 98"W x 51"H |
N-44593 | $4,183.00 |
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2500 Gallon Underground Holding Tank |
2500 Gallons |
159"L x 99"W x 51"H |
N-44079 | $5,108.00 |
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2600 Gallon Underground Holding Tank |
2600 Gallons |
155" L x 98"W x 51"H |
N-43770 | $5,416.00 |
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2650 Gallon Underground Holding Tank |
2650 Gallons |
155" L x 98"W x 81"H |
N-43771 | $5,729.00 |
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3525 Gallon Underground Holding Tank |
3525 Gallons |
211" L x 102" W x 51" H |
N-44390 | $8,377.00 |
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5025 Gallon Underground Holding Tank |
5025 Gallons |
211" L x 102" W x 73" H |
N-44876 | $11,216.00 |
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10000 Gallon Below Ground Holding Tank |
10000 Gallons |
356"L x 101"W x 107"H |
N-45686 | $19,120.00 |
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1000 Gallon Norwesco - 2 Compartment Septic Tank |
1000 Gallons |
102"L x 60"W x 63"H |
N-44475 | $1,617.00 |
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What is the purpose of a Double Compartment Septic Tank?
Aside from differences in capacity between the one and two compartment poly septic tanks, the way in which water flows and collects in your tank is distinct. A second compartment allows more room to settle the solids and liquids in the tank.
In a single compartment tank, one chamber that holds all liquid, sludge and scum. Adding a second compartment provides an additional area for you sludge and liquid to exist. Typically the two compartments are separated by a baffle partition. The partition opening allows for a select amount of liquid to flow into the secondary area. Once liquids inside the septic tank reach the height of the opening, flow into the second chamber begins.
This permits solids more time to settle, allows extra storage space septic waste. As opposed to a single compartment, the extra compartment gives you more space and more time before you need to empty the tank.
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