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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
Ships Fast! ~ 48 Hour Lead Time
47" 47" 56" 47" L
47" W
56" H
1 43745 MN, MS, OH, OK, UT, WA $ 551
225 Gallon Septic Pump Tank - FL Approved
Ships Fast! ~ 48 Hour Lead Time
47" 47" 56" 47" L
47" W
56" H
1 44788 FL $ 601
300 Gallon Septic Pump Tank - FL Approved 54" 54" 54" 54" L
54" W
54" H
1 44789 FL $ 1,032
300 Gallon Septic Pump Tank
Ships Fast! ~ 48 Hour Lead Time
48.5" 48.5" 53" 48.5" L
48.5" W
53" H
1 5260000W94202 AR, CA, MS, NE, WV $ 1,020
300 Gallon Septic Pump Tank 54" 54" 56" 54" L
54" W
56" H
1 AST-0300-1 IA $ 773
300 Gallon Septic Pump Tank
Ships Fast! ~ 48 Hour Lead Time
54" 54" 54" 54" L
54" W
54" H
1 41319 CA, GA, MN, MS, NY, OH, OK, UT, WA $ 767
500 Gallon Septic Pump Tank
Ships Fast! ~ 48 Hour Lead Time
60" 60" 63" 60" L
60" W
63" H
1 5170000W94203 AR, CA, MS, WV $ 1,296
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 $ 989
500 Gallon Septic Pump Tank 64" 64" 67" 64" L
64" W
67" H
1 40785 CA, MN, NY, OH, OK, UT, WA $ 1,021
500 Gallon Septic Tank
Ships Fast! ~ 48 Hour Lead Time
101" 51" 47" 101" L
51" W
47" H
1 41320 FL, GA, MN, MS, UT, WA $ 1,111
500 Gallon Low Profile Septic Tank 97" 48" 42" 97" L
48" W
42" H
1 43522 MS, NY, OH, OK $ 1,060
500 Gallon Pre-Plumbed Low Profile Septic Tank 97" 48" 42" 97" L
48" W
42" H
1 45802 AR, CA, MS, NE, WV $ 1,399
525 Gallon Septic Pump Tank - FL Approved 64" 64" 67" 64" L
64" W
67" H
1 44830 FL $ 1,202
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 $ 1,221
750 Gallon Septic Tank 96" 48" 63" 96" L
48" W
63" H
1 41814 NY $ 1,759
750 Gallon Low Profile Septic Tank 92" 60" 51" 92" L
60" W
51" H
1 43495 MN, NY, OK $ 1,643
750 Gallon Low Profile Septic Tank 92" 60" 51" 92" L
60" W
51" H
2 43499 MN, NY, OK, WA $ 1,765
750 Gallon Low Profile Septic Tank - IAPMO Approved 92" 60" 51" 92" L
60" W
51" H
2 44510 CA $ 1,872
900 Gallon Low Profile Septic Tank - FL Approved
Ships Fast! ~ 48 Hour Lead Time
117" 60" 51" 117" L
60" W
51" H
2 43527 FL $ 2,063
1000 Gallon Septic Tank 101" 60" 60" 101" L
60" W
60" H
1 AST-1000-1 IA $ 1,794
1000 Gallon Septic Tank 101" 60" 60" 101" L
60" W
60" H
2 AST-1000-2 IA $ 1,963
1000 Gallon Bruiser Septic Tank 101" 52" 71" 101" L
52" W
71" H
1 41734 MN $ 2,187
1000 Gallon Bruiser Septic Tank 102" 60" 63" 102" L
60" W
63" H
1 41734 GA, MN, NY, OH, OK, UT, WA $ 2,187
1000 Gallon Bruiser Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41735 GA, MN, NY, OH, OK, UT, WA $ 2,311
1000 Gallon Bruiser Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41820 CA $ 2,311
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 $ 2,037
1000 Gallon Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41720 GA, MN, MS, NY, OH, OK, UT, WA $ 2,141
1000 Gallon Septic Tank 102" 60" 63" 102" L
60" W
63" H
2 41721 CA $ 2,141
1000 Gallon Low Profile Septic Tank
Ships Fast! ~ 48 Hour Lead Time
127" 60" 51" 127" L
60" W
51" H
1 42405 GA, MN, OH, OK, UT, WA $ 1,780
1000 Gallon Low Profile Septic Tank
Ships Fast! ~ 48 Hour Lead Time
127" 60" 51" 127" L
60" W
51" H
2 43517 GA, MN, OH, OK, UT, WA $ 1,902
1000 Gallon Low Profile Septic Tank - Intended For Use In IL 127" 60" 51" 127" L
60" W
51" H
1 43538 OH $ 1,780
1000 Gallon Low Profile Septic Tank - Intended For Use In IL 127" 60" 51" 127" L
60" W
51" H
2 43541 OH $ 1,902
1000 Gallon Low Profile Septic Tank - IAPMO Approved 127" 60" 51" 127" L
60" W
51" H
2 44482 CA $ 2,017
1000 Gallon Low Profile Septic Tank - NC/SC Approved 127" 60" 51" 127" L
60" W
51" H
2 43510 GA $ 1,902
1000 Gallon Low Profile Septic Tank 127" 60" 51" 127" L
60" W
51" H
1 40197 NY $ 1,917
1000 Gallon Low Profile Septic Tank 127" 60" 51" 127" L
60" W
51" H
1 40198 NY $ 2,048
1050 Gallon Low Profile Septic Tank - FL Approved 127" 60" 51" 127" L
60" W
51" H
2 43533 FL $ 2,234
1250 Gallon Low Profile Septic Tank - FL Approved 157" 60" 51" 157" L
60" W
51" H
2 43532 FL $ 3,096
1250 Gallon Septic Tank 118" 58" 72" 118" L
58" W
72" H
1 AST-1250-1 IA $ 2,289
1250 Gallon Septic Tank 118" 58" 72" 118" L
58" W
72" H
2 AST-1250-2 IA $ 2,289
1250 Gallon Bruiser Septic Tank 116" 55" 70" 116" L
55" W
70" H
1 41752 MN, NY, OH, OK, UT, WA $ 2,640
1250 Gallon Bruiser Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41753 MN, NY, OH, OK, UT, WA $ 2,795
1250 Gallon Bruiser Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41821 CA $ 2,795
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
2 43503 MN, OH, OK, UT, WA $ 2,416
1250 Gallon Septic Tank 116" 55" 70" 116" L
55" W
70" H
1 41741 MN, NY, OH, OK, UT, WA $ 2,264
1250 Gallon Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41743 MN, NY, OH, OK, UT, WA $ 2,420
1250 Gallon Septic Tank 116" 55" 70" 116" L
55" W
70" H
2 41744 CA $ 2,420
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
1 43519 MN, OH, OK, UT, WA $ 2,263
1250 Gallon Low Profile Septic Tank - Intended For Use In IL 157" 60" 51" 157" L
60" W
51" H
1 43539 OH $ 2,263
1250 Gallon Low Profile Septic Tank - Intended For Use In IL 157" 60" 51" 157" L
60" W
51" H
2 43542 OH $ 2,416
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
1 43544 GA $ 2,263
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
2 43545 GA $ 2,416
1250 Gallon Low Profile Septic Tank - IAPMO Approved 157" 60" 51" 157" L
60" W
51" H
2 44483 CA $ 2,563
1250 Gallon Low Profile Septic Tank - NC/SC Approved 157" 60" 51" 157" L
60" W
51" H
2 43511 GA $ 2,416
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
1 43572 NY $ 2,437
1250 Gallon Low Profile Septic Tank 157" 60" 51" 157" L
60" W
51" H
2 43571 NY $ 2,416
1500 Gallon Low Profile Septic Tank - FL Approved 157" 69" 51" 157" L
69" W
51" H
2 43531 FL $ 3,269
1500 Gallon Septic Tank 137" 58" 72" 137" L
58" W
72" H
1 AST-1500-1 IA $ 2,611
1500 Gallon Septic Tank 137" 58" 72" 137" L
58" W
72" H
2 AST-1500-2 IA $ 2,953
1500 Gallon Bruiser Septic Tank 135" 55" 70" 135" L
55" W
70" H
1 41771 GA, MN, NY, OH, OK, UT, WA $ 3,178
1500 Gallon Bruiser Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41772 GA, MN, NY, OH, OK, UT, WA $ 3,364
1500 Gallon Bruiser Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41822 CA $ 3,364
1500 Gallon Septic Tank 135" 55" 70" 135" L
55" W
70" H
1 41758 GA, MN, NY, OH, OK, UT, WA $ 2,768
1500 Gallon Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41760 GA, MN, NY, OH, OK, UT, WA $ 2,954
1500 Gallon Septic Tank 135" 55" 70" 135" L
55" W
70" H
2 41761 CA $ 2,954
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
1 43518 MN, NY, OH, OK, UT, WA $ 2,680
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
2 43504 MN, NY, OH, OK, UT, WA $ 2,863
1500 Gallon Low Profile Septic Tank - Intended For Use In IL 157" 69" 51" 157" L
69" W
51" H
1 43540 OH $ 2,680
1500 Gallon Low Profile Septic Tank - Intended For Use In IL 157" 69" 51" 157" L
69" W
51" H
2 43543 OH $ 2,863
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
1 43546 GA $ 2,680
1500 Gallon Low Profile Septic Tank 157" 69" 51" 157" L
69" W
51" H
2 43547 GA $ 2,863
1500 Gallon Low Profile Septic Tank - IAPMO Approved 157" 69" 51" 157" L
69" W
51" H
2 44484 CA $ 3,037
1500 Gallon Low Profile Septic Tank - NC/SC Approved 157" 69" 51" 157" L
69" W
51" H
2 43512 GA $ 2,863
2000 Gallon Septic Tank 126" 98" 51" 126" L
98" W
51" H
1 42559 WA $ 4,419
2000 Gallon Septic Tank 126" 98" 51" 126" L
98" W
51" H
1 44593 MN, OH, OK $ 4,419
2500 Gallon Septic Tank 159" 99" 51" 159" L
99" W
51" H
1 44079 CA, MN, OK $ 5,489
2600 Gallon Septic Tank 155" 99" 51" 155" L
99" W
51" H
1 43770 MN $ 5,777
2650 Gallon Septic Tank 155" 99" 81" 155" L
99" W
81" H
1 43771 MN $ 6,066
3525 Gallon Septic Tank 211" 102" 51" 211" L
102" W
51" H
1 44390 CA, MN, TX $ 8,944
5025 Gallon Septic Tank 211" 102" 73" 211" L
102" W
73" H
1 44876 MN, TX, UT $ 12,815
5025 Gallon Septic Tank 211" 102" 96" 211" L
102" W
96" H
1 44877 MN, TX, UT $ 12,982
10000 Gallon Septic Tank 356" 101" 107" 356" L
101" W
107" H
1 45686 MN $ 22,589
15000 Gallon Septic Tank 511" 101" 107" 511" L
101" W
107" H
1 41615 MN $ 42,962
20000 Gallon Septic Tank 665" 101" 107" 665" L
101" W
107" H
1 41616 MN $ 57,922
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