The Norwesco 1500 gallon two-compartment septic tank is a single, one-piece rotationally molded polyethylene tank with two internal baffled compartments — not two tanks and no field assembly of shells to bolt together. It carries IAPMO certification for U.S. onsite wastewater systems where code calls for a two-compartment design, and it ships with gaskets, tees, and two manhole covers: the sealing and access components for both compartments come in the box, while pipe, risers to grade, and an effluent filter are sized to your install. Standing 70 inches tall on a 55 x 135 inch footprint, this yellow poly tank holds 1,500 gallons split across its two chambers.
Will it work for your system?
The two-compartment layout separates solids settling from the clarified effluent that moves toward your drainfield, which is exactly what many local plumbing and health codes require for a new septic install. This Norwesco unit is IAPMO certified. If you are weighing single versus two-compartment for your situation, read Single Compartment vs Two Compartment Septic Tanks before you commit, and confirm with your local inspector that an IAPMO-listed poly septic tank is accepted in your county, along with the burial depth and bedding requirements for your soil.
Dimensions, set weight, and freight sourcing
Plan your excavation around the 135 inch length, 55 inch width, and 70 inch height. It ships empty as a single piece on LTL freight; the figure that matters for your hole is the loaded condition — full of water this tank weighs about 12,510 pounds, so the bedding and backfill all need to support a filled tank without shifting or letting the compartments move out of alignment. Because we source from the nearest of seven Norwesco plants, the LTL miles on a tank this heavy stay as short as your location allows. Review the technical drawing on this page for inlet and outlet invert locations, manhole positions, and tee placement so your plumbing runs line up before the tank goes in the ground. For broader planning, the Tank Sizing Calculator and Tank Sizing Guide can help you confirm 1,500 gallons matches your bedroom count or flow requirement.
The mistake to avoid
The most common error on a poly septic install is the dirt around it: plastic septic tanks must be set per the manufacturer's instructions with proper bedding and backfill so the tank is fully supported. A second is approvals across borders — IAPMO certification governs U.S. acceptance, but Canadian installs reference CSA B66, and the two listings are not interchangeable. If you are anywhere near a cross-border project, read Norwesco IAPMO and CSA B66 Septic Tank Approvals first so you order against the right listing.
This tank ships LTL freight, quoted live to your ZIP from the nearest stocking Norwesco plant — Griffin, GA; Lancaster, OH; Owego, NY; Shawnee, OK; St. Bonifacius, MN; Tooele, UT; or Washougal, WA. Get a freight number in seconds with our Freight Cost Estimator, or call 866-418-1777 to confirm the IAPMO listing for your jurisdiction and lock in delivery. Listed before freight; LTL is quoted separately to your ZIP.
