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Underground Plastic Septic Tanks

Buy Underground Plastic Septic Tanks for sale online at the lowest prices and save up to 50%.

about underground septic tanks

Underground septic tanks are also referred to as sewer tanks, below ground septic tanks, waste holding tanks, cesspool tanks, cesspits, bulk sewage tanks, and black water tanks. They are used to contain human waste, sewage, and blackwater. These septic tanks are designed for use in residential and commercial settings where local municipalities have not run sewer pipes. They provide the foundation of septic systems for stationary dwellings such as houses, hunting camps, cabins, and cottages. They also serve as the sole sewage containment vessel for recreational vehicles and trailer homes. Septic tanks are not intended to contain or transport potable water, and are not FDA- approved for this purpose.

These sewage tanks are manufactured by Norwesco, Ace Roto-Mold, and Snyder. High-density virgin polyethylene resin is rotationally molded to create these plastic septic tanks. The rotational molding process generates seamless, durable, and impact resistant tanks. UV inhibitors are added during production that protect the tank from sun degradation so it can be used outdoors. These septic tanks are intended for burial underground or in a man-made mound as part of a septic system.

Since each septic tank is made from plastic, they are lightweight and much easier to install than fiberglass or concrete septic tanks. They come in yellow, black, light green, and grey. These plastic sewage tanks will safely withstand a wide range of temperatures and weather conditions. These properties have given the tanks a long useful lifespan.

Underground septic tanks are available in sizes ranging from 200 gallons up to 1500 gallons. An inlet and outlet may be added to tanks sized 200 gallons to 500 gallons for $75.00. Manufacturers will install 4” inlet and outlet plumbing kits for the septic tanks when requested. A 4” inlet and outlet is a standard feature on tanks sized 750 gallons to 1500 gallons. Each plastic sewage tank comes with a lid, and manway extensions and risers may be added if desired. Every septic tank is also covered by a manufacturer's three year warranty. Search our state approved septic tanks that meet your state’s septic system code requirements.

Get the lowest prices on underground septic tanks for sale at the National Tank Outlet. Shop our most common sizes: 1000 gallon septic tanks and 1500 gallon septic tanks.

Underground Plastic Septic Tanks

septic tanks for sale

Tank / Capacity Length Width Height Size Compartments Part# From Price
200 Gallon Septic Pump Tank 47" 47" 56" 47" L
47" W
56" H
1 43745 MN, MS, OH, OK, UT $ 454
225 Gallon Septic Pump Tank - FL Approved 47" 47" 56" 47" L
47" W
56" H
1 44788 FL $ 442
300 Gallon Septic Pump Tank - FL Approved 54" 54" 54" 54" L
54" W
54" H
1 44789 FL $ 826
300 Gallon Septic Pump Tank 48.5" 48.5" 53" 48.5" L
48.5" W
53" H
1 5260000W94202 AR, CA, MS, NE, WV $ 816
300 Gallon Septic Pump Tank 54" 54" 56" 54" L
54" W
56" H
1 AST-0300-1 IA $ 655
300 Gallon Septic Pump Tank 54" 54" 54" 54" L
54" W
54" H
1 41319 CA, GA, MN, MS, NY, OH, OK, UT, WA $ 633
500 Gallon Septic Pump Tank 60" 60" 63" 60" L
60" W
63" H
1 5170000W94203 AR, CA, MS, WV $ 1,037
500 Gallon Septic Tank 88" 48" 43" 88" L
48" W
43" H
1 ST21L MS $ 0
500 Gallon Septic Pump Tank 63" 63" 74" 63" L
63" W
74" H
1 AST-0500-1 IA $ 838
500 Gallon Low Profile Septic Tank 97" 48" 42" 97" L
48" W
42" H
1 43522 MS, NY, OH, OK $ 894
500 Gallon Septic Pump Tank 64" 64" 67" 64" L
64" W
67" H
1 40785 CA, MN, NY, OH, OK, UT, WA $ 838
500 Gallon Septic Tank 101" 51" 47" 101" L
51" W
47" H
1 41320 GA, MN, MS, UT, WA $ 899
500 Gallon Pre-Plumbed Low Profile Septic Tank 97" 48" 42" 97" L
48" W
42" H
1 45802 AR, CA, MS, NE, WV $ 1,119
525 Gallon Septic Pump Tank - FL Approved 64" 64" 67" 64" L
64" W
67" H
1 44830 FL $ 961
750 Gallon Septic Tank 96" 52" 62" 96" L
52" W
62" H
1 41712 MN, OH $ 0
750 Gallon Septic Tank 70" 60" 60" 70" L
60" W
60" H
1 AST-0750-1 IA $ 1,035
750 Gallon Low Profile Septic Tank 92" 60" 51" 92" L
60" W
51" H
1 43495 MN, OK $ 1,322
750 Gallon Low Profile Septic Tank 92" 60" 51" 92" L
60" W
51" H
2 43499 MN, NY, OK, WA $ 1,416
750 Gallon Septic Tank 96" 48" 63" 96" L
48" W
63" H
1 41814 NY $ 1,444
750 Gallon Low Profile Septic Tank - IAPMO Approved 92" 60" 51" 92" L
60" W
51" H
2 44510 CA $ 1,513
900 Gallon Low Profile Septic Tank - FL Approved 117" 60" 51" 117" L
60" W
51" H
2 43527 FL $ 1,650
1000 Gallon Septic Tank 101" 60" 60" 101" L
60" W
60" H
1 AST-1000-1 IA $ 1,520
1000 Gallon Septic Tank 101" 60" 60" 101" L
60" W
60" H
2 AST-1000-2 IA $ 1,664
1000 Gallon Bruiser Septic Tank 101" 52" 71" 101" L
52" W
71" H
1 41734 MN $ 1,798
1000 Gallon Bruiser Septic Tank 102" 60" 63" 102" L
60" W
63" H
1 41734 GA, MN, NY, OH, OK, UT, WA $ 1,953
1000 Gallon Bruiser Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41735 GA, MN, NY, OH, OK, UT, WA $ 2,063
1000 Gallon Bruiser Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41820 CA $ 2,063
1000 Gallon Low Profile Septic Tank 127" 60" 51" 127" L
60" W
51" H
1 42405 GA, MN, NY, OH, OK, UT, WA $ 1,406
1000 Gallon Low Profile Septic Tank 127" 60" 51" 127" L
60" W
51" H
2 43517 GA, MN, NY, OH, OK, UT, WA $ 1,429
1000 Gallon Septic Tank 101" 52" 71" 101" L
52" W
71" H
1 44622 MN, OH $ 0
1000 Gallon Septic Tank 102" 60" 63" 102" L
60" W
63" H
1 41718 GA, MN, MS, NY, OH, OK, UT, WA $ 1,513
1000 Gallon Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41720 GA, MN, MS, NY, OH, OK, UT, WA $ 1,624
1000 Gallon Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41721 CA $ 1,624
1000 Gallon Low Profile Septic Tank - Intended For Use In IL 127" 60" 51" 127" L
60" W
51" H
1 43538 OH $ 1,430
1000 Gallon Low Profile Septic Tank - Intended For Use In IL 127" 60" 51" 127" L
60" W
51" H
2 43541 OH $ 1,541
1000 Gallon Low Profile Septic Tank - IAPMO Approved 127" 60" 51" 127" L
60" W
51" H
2 44482 CA $ 1,624
1000 Gallon Low Profile Septic Tank - NC/SC Approved 127" 60" 51" 127" L
60" W
51" H
2 43510 GA $ 1,541
1050 Gallon Low Profile Septic Tank - FL Approved 127" 60" 51" 127" L
60" W
51" H
2 43533 FL $ 1,787
1250 Gallon Low Profile Septic Tank - FL Approved 157" 60" 51" 157" L
60" W
51" H
2 43532 FL $ 2,476
1250 Gallon Septic Tank 118" 58" 72" 118" L
58" W
72" H
1 AST-1250-1 IA $ 1,940
1250 Gallon Septic Tank 118" 58" 72" 118" L
58" W
72" H
2 AST-1250-2 IA $ 1,940
1250 Gallon Bruiser Septic Tank 116" 55" 70" 116" L
55" W
70" H
1 41752 MN, NY, OH, OK, UT, WA $ 2,366
1250 Gallon Bruiser Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41753 MN, NY, OH, OK, UT, WA $ 2,504
1250 Gallon Bruiser Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41821 CA $ 2,504
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
1 43519 MN, NY, OH, OK, UT, WA $ 1,830
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
2 43503 MN, NY, OH, OK, UT, WA $ 1,953
1250 Gallon Septic Tank 116" 55" 70" 116" L
55" W
70" H
1 41741 MN, NY, OH, OK, UT, WA $ 1,857
1250 Gallon Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41743 MN, NY, OH, OK, UT, WA $ 1,981
1250 Gallon Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41744 CA $ 1,981
1250 Gallon Low Profile Septic Tank - Intended For Use In IL 157" 60" 51" 157" L
60" W
51" H
1 43539 OH $ 1,830
1250 Gallon Low Profile Septic Tank - Intended For Use In IL 157" 60" 51" 157" L
60" W
51" H
2 43542 OH $ 1,953
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
1 43544 GA $ 1,830
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
2 43545 GA $ 1,953
1250 Gallon Low Profile Septic Tank - IAPMO Approved 157" 60" 51" 157" L
60" W
51" H
2 44483 CA $ 2,063
1250 Gallon Low Profile Septic Tank - NC/SC Approved 157" 60" 51" 157" L
60" W
51" H
2 43511 GA $ 1,953
1500 Gallon Low Profile Septic Tank - FL Approved 157" 69" 51" 157" L
69" W
51" H
2 43531 FL $ 2,614
1500 Gallon Septic Tank 137" 58" 72" 137" L
58" W
72" H
1 AST-1500-1 IA $ 2,213
1500 Gallon Septic Tank 137" 58" 72" 137" L
58" W
72" H
2 AST-1500-2 IA $ 2,503
1500 Gallon Bruiser Septic Tank 135" 55" 70" 135" L
55" W
70" H
1 41771 GA, MN, NY, OH, OK, UT, WA $ 2,833
1500 Gallon Bruiser Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41772 GA, MN, NY, OH, OK, UT, WA $ 3,013
1500 Gallon Bruiser Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41822 CA $ 3,013
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
1 43518 MN, NY, OH, OK, UT, WA $ 2,159
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
2 43504 MN, NY, OH, OK, UT, WA $ 2,310
1500 Gallon Septic Tank 135" 55" 70" 135" L
55" W
70" H
1 41758 GA, MN, NY, OH, OK, UT, WA $ 2,268
1500 Gallon Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41760 GA, MN, NY, OH, OK, UT, WA $ 2,421
1500 Gallon Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41761 CA $ 2,421
1500 Gallon Low Profile Septic Tank - Intended For Use In IL 157" 69" 51" 157" L
69" W
51" H
1 43540 OH $ 2,159
1500 Gallon Low Profile Septic Tank - Intended For Use In IL 157" 69" 51" 157" L
69" W
51" H
2 43543 OH $ 2,310
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
1 43546 GA $ 2,159
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
2 43547 GA $ 2,310
1500 Gallon Low Profile Septic Tank - IAPMO Approved 157" 69" 51" 157" L
69" W
51" H
2 44484 CA $ 2,449
1500 Gallon Low Profile Septic Tank - NC/SC Approved 157" 69" 51" 157" L
69" W
51" H
2 43512 GA $ 2,310
2000 Gallon Septic Tank 126" 98" 51" 126" L
98" W
51" H
1 42559 WA $ 3,617
2000 Gallon Septic Tank 126" 98" 51" 126" L
98" W
51" H
1 44593 MN, OH, OK $ 3,617
2500 Gallon Septic Tank 159" 99" 51" 159" L
99" W
51" H
1 44079 CA, MN, OK $ 4,484
2600 Gallon Septic Tank 155" 99" 51" 155" L
99" W
51" H
1 43770 MN $ 4,464
2650 Gallon Septic Tank 155" 99" 81" 155" L
99" W
81" H
1 43771 MN $ 4,965
3525 Gallon Septic Tank 211" 102" 51" 211" L
102" W
51" H
1 44390 CA, MN, TX $ 7,319
5025 Gallon Septic Tank 211" 102" 73" 211" L
102" W
73" H
1 44876 MN, TX, UT $ 10,482
5025 Gallon Septic Tank 211" 102" 96" 211" L
102" W
96" H
1 44877 MN, TX, UT $ 10,620
10000 Gallon Septic Tank 356" 101" 107" 356" L
101" W
107" H
1 45686 MN $ 17,869
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