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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

Set Descending Direction
NameLengthWidthHeightCompartmentsPart#DimensionsShips FromPrice
200 Gallon Septic Pump Tank47"47"56"147" L x 47" W x 56" H43745MN, OK$ 320
300 Gallon Septic Pump Tank48.5"48.5"53"148.5" L x 48.5" W x 53" HST11SAR, CA, NE, WV$ 510
300 Gallon Septic Pump Tank54"54"56"154" L x 54" W x 56" HAST-0300-1IA, MS$ 457
300 Gallon Septic Pump Tank54"54"54"154" L x 54" W x 54" H41319CA, GA, MN, MS, NY, OH, OK, UT, WA$ 390
500 Gallon Septic Pump Tank60"60"63"160" L x 60" W x 63" HST21SAR, CA, NE, WV$ 590
500 Gallon Septic Tank88"48"43"188" L x 48" W x 43" HST21LAR, CA, NE, WV$ 640
500 Gallon Septic Pump Tank63"63"74"163" L x 63" W x 74" HAST-0500-1IA, MS$ 596
500 Gallon Low Profile Septic Tank97"48"42"197" L x 48" W x 42" H43522NY, OH, OK$ 540
500 Gallon Septic Pump Tank64"64"67"164" L x 64" W x 67" H40785CA, MN, OH, OK, WA$ 530
500 Gallon Septic Tank101"51"47"1101" L x 51" W x 47" H41320GA, MN, MS, UT, WA$ 580
750 Gallon Septic Tank70"60"60"170" L x 60" W x 60" HAST-0750-1IA$ 731
750 Gallon Low Profile Septic Tank92"60"51"192" L x 60" W x 51" H43495MN, OK$ 880
750 Gallon Low Profile Septic Tank92"60"51"292" L x 60" W x 51" H43499MN, OK$ 970
750 Gallon Septic Tank96"52"62"196" L x 52" W x 62" H41712MN, OH$ 900
750 Gallon Septic Tank96"48"63"196" L x 48" W x 63" H41814NY$ 900
750 Gallon Low Profile Septic Tank92"60"51"292" L x 60" W x 51" H44510CA$ 1,010
1000 Gallon Septic Tank101"60"60"1101" L x 60" W x 60" HAST-1000-1IA$ 1,020
1000 Gallon Septic Tank101"60"60"2101" L x 60" W x 60" HAST-1000-2IA$ 1,173
1000 Gallon Bruiser Septic Tank101"52"71"1101" L x 52" W x 71" H41768MN$ 1,080
1000 Gallon Bruiser Septic Tank102"60"63"1102" L x 60" W x 63" H41734GA, MN, NY, OH, OK, UT, WA$ 1,110
1000 Gallon Bruiser Septic Tank102"60"63"2102" L x 60" W x 63" H41735GA, MN, NY, OH, OK, UT, WA$ 1,180
1000 Gallon Bruiser Septic Tank102"60"63"2102" L x 60" W x 63" H41820CA$ 1,180
1000 Gallon Low Profile Septic Tank127"60"51"1127" L x 60" W x 51" H42405MN, NY, OH, OK, UT, WA$ 960
1000 Gallon Low Profile Septic Tank127"60"51"2127" L x 60" W x 51" H43517MN, NY, OH, OK, UT, WA$ 1,020
1000 Gallon Septic Tank101"52"71"1101" L x 52" W x 71" H44622MN, OH$ 910
1000 Gallon Septic Tank102"60"63"1102" L x 60" W x 63" H41718GA, MN, MS, NY, OH, OK, UT, WA$ 940
1000 Gallon Septic Tank102"60"63"2102" L x 60" W x 63" H41720GA, MN, MS, NY, OH, OK, UT, WA$ 1,010
1000 Gallon Septic Tank102"60"63"2102" L x 60" W x 63" H41721CA$ 1,010
1000 Gallon Low Profile Septic Tank127"60"51"1127" L x 60" W x 51" H43538OH$ 930
1000 Gallon Low Profile Septic Tank127"60"51"2127" L x 60" W x 51" H43541OH$ 990
1000 Gallon Low Profile Septic Tank127"60"51"2127" L x 60" W x 51" H44482CA$ 1,040
1250 Gallon Septic Tank118"58"72"1118" L x 58" W x 72" HAST-1250-1IA$ 1,383
1250 Gallon Septic Tank118"58"72"2118" L x 58" W x 72" HAST-1250-2IA$ 1,368
1250 Gallon Bruiser Septic Tank116"55"70"1116" L x 55" W x 70" H41752MN, NY, OH, OK, UT, WA$ 1,340
1250 Gallon Bruiser Septic Tank116"55"70"2116" L x 55" W x 70" H41753MN, NY, OH, OK, UT, WA$ 1,420
1250 Gallon Bruiser Septic Tank116"55"70"2116" L x 55" W x 70" H41821CA$ 1,420
1250 Gallon Low Profile Septic Tank157"60"51"1157" L x 60" W x 51" H43519MN, NY, OH, OK, UT, WA$ 1,200
1250 Gallon Low Profile Septic Tank157"60"51"2157" L x 60" W x 51" H43503MN, NY, OH, OK, UT, WA$ 1,280
1250 Gallon Septic Tank116"55"70"1116" L x 55" W x 70" H41741MN, NY, OH, OK, UT, WA$ 1,140
1250 Gallon Septic Tank116"55"70"2116" L x 55" W x 70" H41743MN, NY, OH, OK, UT, WA$ 1,230
1250 Gallon Septic Tank116"55"70"2116" L x 55" W x 70" H41744CA$ 1,230
1250 Gallon Low Profile Septic Tank157"60"51"1157" L x 60" W x 51" H43539OH$ 1,220
1250 Gallon Low Profile Septic Tank157"60"51"2157" L x 60" W x 51" H43542OH$ 1,280
1250 Gallon Low Profile Septic Tank157"60"51"1157" L x 60" W x 51" H43544GA$ 1,200
1250 Gallon Low Profile Septic Tank157"60"51"2157" L x 60" W x 51" H43545GA$ 1,280
1250 Gallon Low Profile Septic Tank157"60"51"2157" L x 60" W x 51" H44483CA$ 1,360
1500 Gallon Septic Tank140"64"62"1140" L x 64" W x 62" HST71RAR, CA, NE, WV$ 1,670
1500 Gallon Septic Tank140"64"62"1140" L x 64" W x 62" HST71RUAR, CA, NE, WV$ 1,620
1500 Gallon Septic Tank140"64"62"2140" L x 64" W x 62" HST72RAR, CA, NE, WV$ 1,830
1500 Gallon Septic Tank140"64"62"2140" L x 64" W x 62" HST72RUAR, CA, NE, WV$ 1,780
1500 Gallon Septic Tank137"58"72"1137" L x 58" W x 72" HAST-1500-1IA$ 1,590
1500 Gallon Septic Tank137"58"72"2137" L x 58" W x 72" HAST-1500-2IA$ 1,741
1500 Gallon Bruiser Septic Tank135"55"70"1135" L x 55" W x 70" H41771GA, MN, NY, OH, OK, UT, WA$ 1,610
1500 Gallon Bruiser Septic Tank135"55"70"2135" L x 55" W x 70" H41772GA, MN, NY, OH, OK, UT, WA$ 1,710
1500 Gallon Bruiser Septic Tank135"55"70"2135" L x 55" W x 70" H41822CA$ 1,710
1500 Gallon Low Profile Septic Tank157"69"51"1157" L x 69" W x 51" H43518MN, NY, OH, OK, UT, WA$ 1,390
1500 Gallon Low Profile Septic Tank157"69"51"2157" L x 69" W x 51" H43504MN, NY, OH, OK, UT, WA$ 1,500
1500 Gallon Septic Tank135"55"70"1135" L x 55" W x 70" H41758GA, MN, NY, OH, OK, UT, WA$ 1,400
1500 Gallon Septic Tank135"55"70"2135" L x 55" W x 70" H41760GA, MN, NY, OH, OK, UT, WA$ 1,510
1500 Gallon Septic Tank135"55"70"2135" L x 55" W x 70" H41761CA$ 1,510
1500 Gallon Low Profile Septic Tank157"69"51"1157" L x 69" W x 51" H43540OH$ 1,390
1500 Gallon Low Profile Septic Tank157"69"51"2157" L x 69" W x 51" H43543OH$ 1,500
1500 Gallon Low Profile Septic Tank157"69"51"1157" L x 69" W x 51" H43546GA$ 1,390
1500 Gallon Low Profile Septic Tank157"69"51"2157" L x 69" W x 51" H43547GA$ 1,500
1500 Gallon Low Profile Septic Tank157"69"51"2157" L x 69" W x 51" H44484CA$ 1,570
2000 Gallon Septic Tank126"98"51"1126" L x 98" W x 51" H42559WA$ 2,180
2000 Gallon Septic Tank126"98"51"1126" L x 98" W x 51" H44593MN, OH, OK$ 2,180
2500 Gallon Septic Tank159"99"51"1159" L x 99" W x 51" H44079CA, MN$ 2,710
2600 Gallon Septic Tank155"99"51"1155" L x 99" W x 51" H43770MN$ 2,860
2650 Gallon Septic Tank155"99"81"1155" L x 99" W x 81" H43771MN$ 3,000
3525 Gallon Septic Tank211"102"51"1211" L x 102" W x 51" H44390CA, MN, TX$ 4,420

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