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Underground Plastic Septic Tanks

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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. They are also free- standing and self- supporting. 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.

Underground Plastic Septic Tanks

Set Descending Direction
NameLengthWidthHeightCompartmentsPart#DimensionsShips FromPrice
200 Gallon Septic Pump Tank47"47"56"147" L x 47" W x 56" H43745MN, OK$ 312
300 Gallon Septic Pump Tank48.5"48.5"53"148.5" L x 48.5" W x 53" HPT1FLWV$ 496
300 Gallon Septic Pump Tank54"54"54"154" L x 54" W x 54" H41319CA, GA, MN, NY, OH, OK, UT, WA$ 382
300 Gallon Septic Pump Tank54"54"56"154" L x 54" W x 56" HAST-0300-1IA$ 457
300 Gallon Septic Pump Tank48.5"48.5"53"148.5" L x 48.5" W x 53" HST11SAR, CA, NE, WV$ 457
500 Gallon Low Profile Septic Tank97"48"42"197" L x 48" W x 42" H43522NY, OK$ 546
500 Gallon Septic Pump Tank63"63"74"163" L x 63" W x 74" HAST-0500-1IA$ 596
500 Gallon Septic Pump Tank60"60"63"160" L x 60" W x 63" HST21SAR, CA, NE, WV$ 593
500 Gallon Septic Tank101"51"47"1101" L x 51" W x 47" H41320GA, MN, OH, UT, WA$ 552
500 Gallon Septic Tank88"48"43"188" L x 48" W x 43" HST21LAR, CA, NE, WV$ 593
500 Gallon Septic Pump Tank60"60"63"160" L x 60" W x 63" HPT2FLWV$ 767
500 Gallon Septic Pump Tank64"64"67"164" L x 64" W x 67" H40785CA, MN, OH, OK, WA$ 506
750 Gallon Septic Tank96"48"63"196" L x 48" W x 63" H41814NY$ 844
750 Gallon Septic Tank96"60"51"196" L x 60" W x 51" HPT3DFLWV$ 1,087
750 Gallon Septic Tank96"60"51"196" L x 60" W x 51" HST31DPAR, CA, NE, WV$ 985
750 Gallon Low Profile Septic Tank92"60"51"192" L x 60" W x 51" H43520MN, OK$ 875
750 Gallon Septic Tank70"60"60"170" L x 60" W x 60" HAST-0750-1IA$ 731
750 Gallon Septic Tank96"52"62"196" L x 52" W x 62" H41712MN, OH$ 838
750 Gallon Septic Tank96"60"51"296" L x 60" W x 51" HST32DPAR, CA, NE, WV$ 1,123
750 Gallon Low Profile Septic Tank92"60"51"292" L x 60" W x 51" H43521MN, OK$ 934
900 Gallon Septic Tank118"60"51"2118" L x 60" W x 51" HST4DFLWV$ 1,094
1000 Gallon Bruiser Septic Tank102"60"63"2102" L x 60" W x 63" H41820CA$ 1,109
1000 Gallon Septic Tank102"60"63"1102" L x 60" W x 63" H41718GA, MN, NY, OH, OK, UT, WA$ 894
1000 Gallon Septic Tank96"60"51"296" L x 60" W x 51" HST52DPAR, CA, NE, WV$ 1,193
1000 Gallon Bruiser Septic Tank102"60"63"1102" L x 60" W x 63" H41734GA, MN, NY, OH, OK, UT, WA$ 1,044
1000 Gallon Septic Tank101"60"60"2101" L x 60" W x 60" HAST-1000-2IA$ 1,173
1000 Gallon Septic Tank126"60"51"1126" L x 60" W x 51" HPT5DNCAR, CA, NE$ 1,486
1000 Gallon Low Profile Septic Tank127"60"51"1127" L x 60" W x 51" H43496MN, NY, OK, WA$ 942
1000 Gallon Septic Tank102"60"63"2102" L x 60" W x 63" H41720GA, MN, NY, OH, OK, UT, WA$ 940
1000 Gallon Bruiser Septic Tank102"60"63"2102" L x 60" W x 63" H41735GA, MN, NY, OH, OK, UT, WA$ 1,109
1000 Gallon Septic Tank101"52"71"1101" L x 52" W x 71" H41716MN, OH$ 871
1000 Gallon Bruiser Septic Tank101"52"71"1101" L x 52" W x 71" H41768MN$ 1,029
1000 Gallon Septic Tank126"60"51"1126" L x 60" W x 51" HST51DPAR, CA, NE, WV$ 1,089
1000 Gallon Low Profile Septic Tank127"60"51"2127" L x 60" W x 51" H42406MN, NY, OK, WA$ 994
1000 Gallon Septic Tank101"60"60"1101" L x 60" W x 60" HAST-1000-1IA$ 1,020
1000 Gallon Septic Tank102"60"63"2102" L x 60" W x 63" H41721CA$ 940
1050 Gallon Septic Tank133"60"51"2133" L x 60" W x 51" HST5DFLWV$ 1,248
1050 Gallon Septic Tank100"64"62"2100" L x 64" W x 62" HST52RAR, CA, NE, WV$ 1,074
1050 Gallon Septic Tank100"64"62"1100" L x 64" W x 62" HST51RAR, CA, NE, WV$ 970
1250 Gallon Septic Tank161"60"51"1161" L x 60" W x 51" HST61DPAR, CA, NE, WV$ 1,511
1250 Gallon Septic Tank118"58"72"1118" L x 58" W x 72" HAST-1250-1IA$ 1,383
1250 Gallon Low Profile Septic Tank157"60"51"1157" L x 60" W x 51" H43497MN, NY, OK, WA$ 1,173
1250 Gallon Septic Tank116"55"70"2116" L x 55" W x 70" H41744CA$ 1,148
1250 Gallon Septic Tank119"64"62"2119" L x 64" W x 62" HST62RAR, CA, NE, WV$ 1,472
1250 Gallon Bruiser Septic Tank116"55"70"2116" L x 55" W x 70" H41821CA$ 1,335
1250 Gallon Septic Tank116"55"70"1116" L x 55" W x 70" H41741MN, NY, OH, OK, UT, WA$ 1,082
1250 Gallon Bruiser Septic Tank116"55"70"1116" L x 55" W x 70" H41752MN, NY, OH, OK, UT, WA$ 1,253
1250 Gallon Septic Tank161"60"51"2161" L x 60" W x 51" HST62DPAR, CA, NE, WV$ 1,668
1250 Gallon Septic Tank161"60"51"2161" L x 60" W x 51" HST6DFLWV$ 1,783
1250 Gallon Septic Tank118"58"72"2118" L x 58" W x 72" HAST-1250-2IA$ 1,368
1250 Gallon Low Profile Septic Tank157"60"51"2157" L x 60" W x 51" H43501MN, NY, OK, WA$ 1,253
1250 Gallon Septic Tank126"60"51"1126" L x 60" W x 51" HPT6DNCAR, NE, WV$ 1,789
1250 Gallon Septic Tank116"55"70"2116" L x 55" W x 70" H41743MN, NY, OH, OK, UT, WA$ 1,158
1250 Gallon Septic Tank119"64"62"1119" L x 64" W x 62" HST61RAR, CA, NE, WV$ 1,318
1250 Gallon Bruiser Septic Tank116"55"70"2116" L x 55" W x 70" H41753MN, NY, OH, OK, UT, WA$ 1,336
1500 Gallon Septic Tank137"58"72"1137" L x 58" W x 72" HAST-1500-1IA$ 1,590
1500 Gallon Low Profile Septic Tank157"69"51"1157" L x 69" W x 51" H43498MN, NY, OK, WA$ 1,368
1500 Gallon Septic Tank135"55"70"2135" L x 55" W x 70" H41760GA, MN, NY, OH, OK, UT, WA$ 1,391
1500 Gallon Septic Tank140"64"62"1140" L x 64" W x 62" HST71RAR, CA, NE, WV$ 1,604
1500 Gallon Bruiser Septic Tank135"55"70"2135" L x 55" W x 70" H41772GA, MN, NY, OH, OK, UT, WA$ 1,590
1500 Gallon Septic Tank191"60"51"1191" L x 60" W x 51" HPT7DNCCA, WV$ 2,123
1500 Gallon Septic Tank191"60"51"2191" L x 60" W x 51" HST72DPAR, CA, NE, WV$ 1,986
1500 Gallon Septic Tank137"58"72"2137" L x 58" W x 72" HAST-1500-2IA$ 1,741
1500 Gallon Low Profile Septic Tank157"69"51"2157" L x 69" W x 51" H43502MN, NY, OK, WA$ 1,468
1500 Gallon Septic Tank135"55"70"2135" L x 55" W x 70" H41761CA$ 1,391
1500 Gallon Septic Tank140"64"62"2140" L x 64" W x 62" HST72RAR, CA, NE, WV$ 1,759
1500 Gallon Bruiser Septic Tank135"55"70"2135" L x 55" W x 70" H41822CA$ 1,590
1500 Gallon Septic Tank135"55"70"1135" L x 55" W x 70" H41758GA, MN, NY, OH, OK, UT, WA$ 1,322
1500 Gallon Bruiser Septic Tank135"55"70"1135" L x 55" W x 70" H41771GA, MN, NY, OH, OK, UT, WA$ 1,483
1500 Gallon Septic Tank191"60"51"1191" L x 60" W x 51" HST71DPAR, CA, NE, WV$ 1,828
1500 Gallon Septic Tank191"60"51"2191" L x 60" W x 51" HST7DFLWV$ 2,067
2000 Gallon Holding Tank126"98"51"1126" L x 98" W x 51" H42559MN, OH, OK$ 2,188
2500 Gallon Holding Tank158"98"51"1158" L x 98" W x 51" H42119CA$ 2,686
2500 Gallon Holding Tank159"99"51"1159" L x 99" W x 51" H44079MN$ 2,686
2600 Gallon Holding Tank155"99"51"1155" L x 99" W x 51" H43770MN$ 2,835
2650 Gallon Holding Tank155"99"81"1155" L x 99" W x 81" H43771MN$ 2,984
3525 Gallon Holding Tank211"102"51"1211" L x 102" W x 51" H44390MN, TX$ 4,377

Set Descending Direction