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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 $ 404
225 Gallon Septic Pump Tank - FL Approved 47" 47" 56" 47" L
47" W
56" H
1 44788 FL $ 393
300 Gallon Septic Pump Tank - FL Approved 54" 54" 54" 54" L
54" W
54" H
1 44789 FL $ 735
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 $ 726
300 Gallon Septic Pump Tank 54" 54" 56" 54" L
54" W
56" H
1 AST-0300-1 IA $ 618
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 $ 563
500 Gallon Septic Pump Tank 60" 60" 63" 60" L
60" W
63" H
1 5170000W94203 AR, CA, MS, WV $ 923
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 $ 791
500 Gallon Low Profile Septic Tank 97" 48" 42" 97" L
48" W
42" H
1 43522 MS, NY, OH, OK $ 795
500 Gallon Septic Pump Tank 64" 64" 67" 64" L
64" W
67" H
1 40785 CA, MN, NY, OH, OK, UT, WA $ 746
500 Gallon Septic Tank 101" 51" 47" 101" L
51" W
47" H
1 41320 GA, MN, MS, UT, WA $ 800
500 Gallon Pre-Plumbed Low Profile Septic Tank 97" 48" 42" 97" L
48" W
42" H
1 45802 AR, CA, MS, NE, WV $ 996
525 Gallon Septic Pump Tank - FL Approved 64" 64" 67" 64" L
64" W
67" H
1 44830 FL $ 856
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 $ 976
750 Gallon Low Profile Septic Tank 92" 60" 51" 92" L
60" W
51" H
1 43495 MN, OK $ 1,176
750 Gallon Low Profile Septic Tank 92" 60" 51" 92" L
60" W
51" H
2 43499 MN, NY, OK, WA $ 1,260
750 Gallon Septic Tank 96" 48" 63" 96" L
48" W
63" H
1 41814 NY $ 1,285
750 Gallon Low Profile Septic Tank - IAPMO Approved 92" 60" 51" 92" L
60" W
51" H
2 44510 CA $ 1,346
900 Gallon Low Profile Septic Tank - FL Approved 117" 60" 51" 117" L
60" W
51" H
2 43527 FL $ 1,469
1000 Gallon Septic Tank 101" 60" 60" 101" L
60" W
60" H
1 AST-1000-1 IA $ 1,434
1000 Gallon Septic Tank 101" 60" 60" 101" L
60" W
60" H
2 AST-1000-2 IA $ 1,570
1000 Gallon Bruiser Septic Tank 101" 52" 71" 101" L
52" W
71" H
1 41734 MN $ 1,600
1000 Gallon Bruiser Septic Tank 102" 60" 63" 102" L
60" W
63" H
1 41734 GA, MN, NY, OH, OK, UT, WA $ 1,738
1000 Gallon Bruiser Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41735 GA, MN, NY, OH, OK, UT, WA $ 1,836
1000 Gallon Bruiser Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41820 CA $ 1,836
1000 Gallon Low Profile Septic Tank 127" 60" 51" 127" L
60" W
51" H
1 42405 GA, MN, NY, OH, OK, UT, WA $ 1,251
1000 Gallon Low Profile Septic Tank 127" 60" 51" 127" L
60" W
51" H
2 43517 GA, MN, NY, OH, OK, UT, WA $ 1,272
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 $ 1,346
1000 Gallon Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41720 GA, MN, MS, NY, OH, OK, UT, WA $ 1,445
1000 Gallon Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41721 CA $ 1,445
1000 Gallon Low Profile Septic Tank - Intended For Use In IL 127" 60" 51" 127" L
60" W
51" H
1 43538 OH $ 1,273
1000 Gallon Low Profile Septic Tank - Intended For Use In IL 127" 60" 51" 127" L
60" W
51" H
2 43541 OH $ 1,372
1000 Gallon Low Profile Septic Tank - IAPMO Approved 127" 60" 51" 127" L
60" W
51" H
2 44482 CA $ 1,445
1000 Gallon Low Profile Septic Tank - NC/SC Approved 127" 60" 51" 127" L
60" W
51" H
2 43510 GA $ 1,372
1050 Gallon Low Profile Septic Tank - FL Approved 127" 60" 51" 127" L
60" W
51" H
2 43533 FL $ 1,591
1250 Gallon Low Profile Septic Tank - FL Approved 157" 60" 51" 157" L
60" W
51" H
2 43532 FL $ 2,204
1250 Gallon Septic Tank 118" 58" 72" 118" L
58" W
72" H
1 AST-1250-1 IA $ 1,830
1250 Gallon Septic Tank 118" 58" 72" 118" L
58" W
72" H
2 AST-1250-2 IA $ 1,830
1250 Gallon Bruiser Septic Tank 116" 55" 70" 116" L
55" W
70" H
1 41752 MN, NY, OH, OK, UT, WA $ 2,106
1250 Gallon Bruiser Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41753 MN, NY, OH, OK, UT, WA $ 2,228
1250 Gallon Bruiser Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41821 CA $ 2,228
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
1 43519 MN, NY, OH, OK, UT, WA $ 1,628
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
2 43503 MN, NY, OH, OK, UT, WA $ 1,738
1250 Gallon Septic Tank 116" 55" 70" 116" L
55" W
70" H
1 41741 MN, NY, OH, OK, UT, WA $ 1,653
1250 Gallon Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41743 MN, NY, OH, OK, UT, WA $ 1,763
1250 Gallon Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41744 CA $ 1,763
1250 Gallon Low Profile Septic Tank - Intended For Use In IL 157" 60" 51" 157" L
60" W
51" H
1 43539 OH $ 1,628
1250 Gallon Low Profile Septic Tank - Intended For Use In IL 157" 60" 51" 157" L
60" W
51" H
2 43542 OH $ 1,738
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
1 43544 GA $ 1,628
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
2 43545 GA $ 1,738
1250 Gallon Low Profile Septic Tank - IAPMO Approved 157" 60" 51" 157" L
60" W
51" H
2 44483 CA $ 1,836
1250 Gallon Low Profile Septic Tank - NC/SC Approved 157" 60" 51" 157" L
60" W
51" H
2 43511 GA $ 1,738
1500 Gallon Low Profile Septic Tank - FL Approved 157" 69" 51" 157" L
69" W
51" H
2 43531 FL $ 2,326
1500 Gallon Septic Tank 137" 58" 72" 137" L
58" W
72" H
1 AST-1500-1 IA $ 2,088
1500 Gallon Septic Tank 137" 58" 72" 137" L
58" W
72" H
2 AST-1500-2 IA $ 2,361
1500 Gallon Bruiser Septic Tank 135" 55" 70" 135" L
55" W
70" H
1 41771 GA, MN, NY, OH, OK, UT, WA $ 2,522
1500 Gallon Bruiser Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41772 GA, MN, NY, OH, OK, UT, WA $ 2,681
1500 Gallon Bruiser Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41822 CA $ 2,681
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
1 43518 MN, NY, OH, OK, UT, WA $ 1,922
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
2 43504 MN, NY, OH, OK, UT, WA $ 2,056
1500 Gallon Septic Tank 135" 55" 70" 135" L
55" W
70" H
1 41758 GA, MN, NY, OH, OK, UT, WA $ 2,019
1500 Gallon Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41760 GA, MN, NY, OH, OK, UT, WA $ 2,155
1500 Gallon Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41761 CA $ 2,155
1500 Gallon Low Profile Septic Tank - Intended For Use In IL 157" 69" 51" 157" L
69" W
51" H
1 43540 OH $ 1,922
1500 Gallon Low Profile Septic Tank - Intended For Use In IL 157" 69" 51" 157" L
69" W
51" H
2 43543 OH $ 2,056
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
1 43546 GA $ 1,922
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
2 43547 GA $ 2,056
1500 Gallon Low Profile Septic Tank - IAPMO Approved 157" 69" 51" 157" L
69" W
51" H
2 44484 CA $ 2,179
1500 Gallon Low Profile Septic Tank - NC/SC Approved 157" 69" 51" 157" L
69" W
51" H
2 43512 GA $ 2,056
2000 Gallon Septic Tank 126" 98" 51" 126" L
98" W
51" H
1 42559 WA $ 3,219
2000 Gallon Septic Tank 126" 98" 51" 126" L
98" W
51" H
1 44593 MN, OH, OK $ 3,219
2500 Gallon Septic Tank 159" 99" 51" 159" L
99" W
51" H
1 44079 CA, MN, OK $ 3,991
2600 Gallon Septic Tank 155" 99" 51" 155" L
99" W
51" H
1 43770 MN $ 4,211
2650 Gallon Septic Tank 155" 99" 81" 155" L
99" W
81" H
1 43771 MN $ 4,419
3525 Gallon Septic Tank 211" 102" 51" 211" L
102" W
51" H
1 44390 CA, MN, TX $ 6,514
5025 Gallon Septic Tank 211" 102" 73" 211" L
102" W
73" H
1 44876 MN, TX, UT $ 9,329
5025 Gallon Septic Tank 211" 102" 96" 211" L
102" W
96" H
1 44877 MN, TX, UT $ 9,452
10000 Gallon Septic Tank 356" 101" 107" 356" L
101" W
107" H
1 45686 MN $ 15,904
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