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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 $ 340
225 Gallon Septic Pump Tank - FL Approved 47" 47" 56" 47" L
47" W
56" H
1 44788 MS $ 320
300 Gallon Septic Pump Tank 48.5" 48.5" 53" 48.5" L
48.5" W
53" H
1 ST11S AR, CA, NE, WV $ 510
300 Gallon Septic Pump Tank 54" 54" 56" 54" L
54" W
56" H
1 AST-0300-1 IA, MS $ 470
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 $ 410
300 Gallon Septic Pump Tank - FL Approved 54" 54" 54" 54" L
54" W
54" H
1 44789 MS $ 450
500 Gallon Septic Pump Tank 60" 60" 63" 60" L
60" W
63" H
1 ST21S AR, CA, NE, WV $ 590
500 Gallon Septic Tank 88" 48" 43" 88" L
48" W
43" H
1 ST21L AR, CA, NE, WV $ 617
500 Gallon Septic Pump Tank 63" 63" 74" 63" L
63" W
74" H
1 AST-0500-1 IA, MS $ 610
500 Gallon Low Profile Septic Tank 97" 48" 42" 97" L
48" W
42" H
1 43522 NY, OH, OK $ 570
500 Gallon Septic Pump Tank 64" 64" 67" 64" L
64" W
67" H
1 40785 CA, MN, OH, OK, WA $ 560
500 Gallon Septic Tank 101" 51" 47" 101" L
51" W
47" H
1 41320 GA, MN, MS, UT, WA $ 610
525 Gallon Septic Pump Tank - FL Approved 64" 64" 67" 64" L
64" W
67" H
1 44830 MS $ 640
750 Gallon Septic Tank 70" 60" 60" 70" L
60" W
60" H
1 AST-0750-1 IA $ 750
750 Gallon Low Profile Septic Tank 92" 60" 51" 92" L
60" W
51" H
1 43495 MN, OK $ 930
750 Gallon Low Profile Septic Tank 92" 60" 51" 92" L
60" W
51" H
2 43499 MN, OK $ 1,000
750 Gallon Septic Tank 96" 52" 62" 96" L
52" W
62" H
1 41712 MN, OH $ 950
750 Gallon Septic Tank 96" 48" 63" 96" L
48" W
63" H
1 41814 NY $ 950
750 Gallon Low Profile Septic Tank 92" 60" 51" 92" L
60" W
51" H
2 44510 CA $ 1,100
900 Gallon Low Profile Septic Tank - FL Approved 117" 60" 51" 117" L
60" W
51" H
2 43527 MS $ 1,000
1000 Gallon Septic Tank 101" 60" 60" 101" L
60" W
60" H
1 AST-1000-1 IA $ 1,100
1000 Gallon Septic Tank 101" 60" 60" 101" L
60" W
60" H
2 AST-1000-2 IA $ 1,200
1000 Gallon Bruiser Septic Tank 101" 52" 71" 101" L
52" W
71" H
1 41768 MN $ 1,100
1000 Gallon Bruiser Septic Tank 102" 60" 63" 102" L
60" W
63" H
1 41734 GA, MN, NY, OH, OK, UT, WA $ 1,200
1000 Gallon Bruiser Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41735 GA, MN, NY, OH, OK, UT, WA $ 1,200
1000 Gallon Bruiser Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41820 CA $ 1,200
1000 Gallon Low Profile Septic Tank 127" 60" 51" 127" L
60" W
51" H
1 42405 GA, MN, NY, OH, OK, UT, WA $ 1,000
1000 Gallon Low Profile Septic Tank 127" 60" 51" 127" L
60" W
51" H
2 43517 GA, MN, NY, OH, OK, UT, WA $ 1,100
1000 Gallon Septic Tank 101" 52" 71" 101" L
52" W
71" H
1 44622 MN, OH $ 960
1000 Gallon Septic Tank 102" 60" 63" 102" L
60" W
63" H
1 41718 GA, MN, MS, NY, OH, OK, UT, WA $ 990
1000 Gallon Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41720 GA, MN, MS, NY, OH, OK, UT, WA $ 1,100
1000 Gallon Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41721 CA $ 1,100
1000 Gallon Low Profile Septic Tank 127" 60" 51" 127" L
60" W
51" H
1 43538 OH $ 980
1000 Gallon Low Profile Septic Tank 127" 60" 51" 127" L
60" W
51" H
2 43541 OH $ 1,000
1000 Gallon Low Profile Septic Tank 127" 60" 51" 127" L
60" W
51" H
2 44482 CA $ 1,100
1000 Gallon Low Profile Septic Tank - NC/SC Approved 127" 60" 51" 127" L
60" W
51" H
2 43510 GA $ 1,100
1050 Gallon Low Profile Septic Tank - FL Approved 127" 60" 51" 127" L
60" W
51" H
2 43533 MS $ 1,200
1250 Gallon Septic Tank 118" 58" 72" 118" L
58" W
72" H
1 AST-1250-1 IA $ 1,400
1250 Gallon Septic Tank 118" 58" 72" 118" L
58" W
72" H
2 AST-1250-2 IA $ 1,400
1250 Gallon Bruiser Septic Tank 116" 55" 70" 116" L
55" W
70" H
1 41752 MN, NY, OH, OK, UT, WA $ 1,400
1250 Gallon Bruiser Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41753 MN, NY, OH, OK, UT, WA $ 1,500
1250 Gallon Bruiser Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41821 CA $ 1,500
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
1 43519 MN, NY, OH, OK, UT, WA $ 1,300
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
2 43503 MN, NY, OH, OK, UT, WA $ 1,300
1250 Gallon Septic Tank 116" 55" 70" 116" L
55" W
70" H
1 41741 MN, NY, OH, OK, UT, WA $ 1,200
1250 Gallon Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41743 MN, NY, OH, OK, UT, WA $ 1,300
1250 Gallon Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41744 CA $ 1,300
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
1 43539 OH $ 1,300
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
2 43542 OH $ 1,300
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
1 43544 GA $ 1,300
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
2 43545 GA $ 1,300
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
2 44483 CA $ 1,400
1250 Gallon Low Profile Septic Tank - NC/SC Approved 157" 60" 51" 157" L
60" W
51" H
2 43511 GA $ 1,300
1250 Gallon Low Profile Septic Tank - FL Approved 157" 60" 51" 157" L
60" W
51" H
2 43532 MS $ 1,500
1500 Gallon Septic Tank 137" 58" 72" 137" L
58" W
72" H
1 AST-1500-1 IA $ 1,600
1500 Gallon Septic Tank 137" 58" 72" 137" L
58" W
72" H
2 AST-1500-2 IA $ 1,800
1500 Gallon Bruiser Septic Tank 135" 55" 70" 135" L
55" W
70" H
1 41771 GA, MN, NY, OH, OK, UT, WA $ 1,700
1500 Gallon Bruiser Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41772 GA, MN, NY, OH, OK, UT, WA $ 1,800
1500 Gallon Bruiser Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41822 CA $ 1,800
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
1 43518 MN, NY, OH, OK, UT, WA $ 1,500
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
2 43504 MN, NY, OH, OK, UT, WA $ 1,600
1500 Gallon Septic Tank 135" 55" 70" 135" L
55" W
70" H
1 41758 GA, MN, NY, OH, OK, UT, WA $ 1,500
1500 Gallon Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41760 GA, MN, NY, OH, OK, UT, WA $ 1,600
1500 Gallon Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41761 CA $ 1,600
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
1 43540 OH $ 1,500
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
2 43543 OH $ 1,600
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
1 43546 GA $ 1,500
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
2 43547 GA $ 1,600
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
2 44484 CA $ 1,700
1500 Gallon Low Profile Septic Tank - NC/SC Approved 157" 69" 51" 157" L
69" W
51" H
2 43512 GA $ 1,600
1500 Gallon Low Profile Septic Tank - FL Approved 157" 69" 51" 157" L
69" W
51" H
2 43531 MS $ 1,700
2000 Gallon Septic Tank 126" 98" 51" 126" L
98" W
51" H
1 42559 WA $ 2,300
2000 Gallon Septic Tank 126" 98" 51" 126" L
98" W
51" H
1 44593 MN, OH, OK $ 2,300
2500 Gallon Septic Tank 159" 99" 51" 159" L
99" W
51" H
1 44079 CA, MN $ 2,900
2600 Gallon Septic Tank 155" 99" 51" 155" L
99" W
51" H
1 43770 MN $ 3,000
2650 Gallon Septic Tank 155" 99" 81" 155" L
99" W
81" H
1 43771 MN $ 3,200
3525 Gallon Septic Tank 211" 102" 51" 211" L
102" W
51" H
1 44390 CA, MN, TX $ 4,700
5025 Gallon Septic Tank 211" 102" 73" 211" L
102" W
73" H
1 44876 MN, TX, UT $ 7,280
5025 Gallon Septic Tank 211" 102" 96" 211" L
102" W
96" H
1 44877 MN, TX, UT $ 7,280
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