Septic Tanks is one of America's leading providers of plastic septic tanks, with an extensive inventory of products from the most reliable brands in the industry....

Plastic septic tanks rotomolded using polyethylene resins are a great option when you’re seeking a septic holding tank for home or commercial installation.

Our rotational molding process produces better, stronger plastic tanks at a much lower cost. Our septic tanks feature a ribbed design for in ground use, as well as a wide range of additional septic tank accessories. Septic tanks are used as holding tanks, waste storage tanks, & more.

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Septic Tank Types

Septic TanksSeptic Tanks
Septic Tanks
Norwesco Bruiser TanksNorwesco Bruiser Tanks
Norwesco Bruiser Tanks
Job Shack Holding TanksJob Shack Holding Tanks
Job Shack Holding Tanks
Snyder Septic TanksSnyder Septic Tanks
Snyder Septic Tanks
Septic TanksSeptic Tanks
IAPMO Approved Septic Tanks
Rectangular Water & Waste TanksRectangular Water & Waste Tanks
Rectangular Water & Waste Tanks

Septic Tanks by Approval Locations

Septic AccessoriesSeptic Accessories
Septic Tanks By State
Septic Tanks Approved in CanadaSeptic Tanks Approved in Canada
Septic Tanks Approved in Canada


Septic AccessoriesSeptic Accessories
Septic Accessories
Leach Chambers
Aeration PumpsAeration Pumps
Aeration Pumps

Featured Manufacturers  Shop All

Plastic-Mart is proud to offer Ace, Norwesco, Snyder Industries brand Septic Tanks. The world’s leading manufacturer of polyethylene tanks, Norwesco has been producing polyethylene septic tanks since 1980. With that kind of experience, Norwesco offers you proven products that you can count on for years of dependable, trouble-free service. Norwesco septic tanks are backed by a full three-year warranty and have been approved by state and local health departments from coast to coast. Where applicable, Norweco septic tanks have been approved by both IAPMO and CSA.

NORWESCO BELOW GROUND TANKS - Conversion Option & Information

Selecting an installation Site For Your Plastic Septic Tank

Ace Roto-Mold Below Ground Septic Tank Product Description

Ease of Installation
For septic system replacement and new home construction, Norwesco’s polyethylene septic tanks are designed for durability and quick, easy installation. Any Norwesco septic tank can be transported to the job site in a pickup truck and carried by just two people. This enables you to install the tank on your schedule.

NORWESCO Installation Instructions

NORWESCO Underground Tank Installation Instructions

NOREWESCO 2500 Gallon Horizontal Box Tank Installation Instructions

Ace Roto-Mold  Installation Instructions

Ace Roto-Mold Below Ground Septic Tank Installations

Ace Roto-Mold Below Ground Spherical Septic Tank Installations

Ace Roto-Mold Low Profile Cistern Tank Installation Instructions

Please consider the following features when you are looking to purchase a septic tank and you’ll find that Norwesco tanks will exceed your expectations when it comes to performance and longevity.

Rotationally Molded, One-Piece Construction
Norwesco septic tanks are manufactured by means of the rotational molding process which produces a one-piece, seamless, watertight tank.

Superior Strength Design
The rib design and rib placement provide superior structural integrity to the tank.

Excellent Chemical Resistance
Polyethylene is unaffected by soil chemicals and by the chemicals and gases present in sewage, so Norwesco septic tanks will not rust or corrode and require no additional coatings as other tanks do. Norwesco’s strict quality guidelines ensure an environmentally safe septic tank.

Single or Double Compartment
Our 750, 1000, 1250 and 1500 gallon tanks are available as single compartment or double compartment tanks (2/3 - 1/3). Prior to installing any septic tank, you should check with your local health department for specific requirements that your county or state may enforce.

Pre-Plumbed / Ready for Installation
Norwesco septic tanks (750 gallons and larger) are shipped to you ready for installation. Our pre-plumbed tanks include tee assemblies installed at the inlet and outlet. Tees are sized/cut according to each state code so the tank that you receive will be ready for installation.

Watertight Lid
Norwesco septic tanks come outfitted with a domed lid. This improved design is significantly stronger than other lid designs. When leaving our factory the lid is attached to the tank with four stainless steel screws and comes standard with a foamed, polyethylene gasket between the lid and the tank. The gasket provides a watertight seal at the lid area.

Accessories Available
Manhole extensions and lid-riser combinations are available to bring tank access to grade and to meet code specifications.

All Products Made in USAAll Products Made in USA