Norwesco 1250 Gallon Plastic Two Compartment Septic Tank with Adapters and 2 Manhole Covers - IAPMO Certified

The Norwesco 1250 gallon two-compartment septic tank is built for residential and light-commercial onsite wastewater systems that need primary settling and clarification in a single, pre-plumbed vessel. It arrives factory-fitted with inlet and outlet adapters and two manhole covers, and it carries IAPMO certification - the listing most U.S. plumbing inspectors and many Canadian authorities look for when approving a polyethylene septic tank. The tank is molded in yellow polyethylene; that molded color is how you confirm what arrives on the truck. It measures 116 inches long, 55 inches wide, and 70 inches high, giving a 55 x 116 inch footprint to plan your excavation around.

Will it work for your install?

The two-compartment design separates the settling and clarification stages, the configuration many codes require or prefer over a single chamber - if you are weighing the two against each other, read our guide on single compartment vs two compartment septic tanks. What's in the box matters here: the inlet and outlet adapters are factory-installed and there are two manhole covers, so both plumbing connections and both access points are ready out of the gate. Plan your dig and bedding using the 55 x 116 inch footprint and the 70 inch height; the Tank Sizing Calculator and Tank Sizing Guide help you confirm capacity against household or system demand. Filled with water this tank weighs roughly 10,425 lb - that is the flooded weight that drives your bedding and anti-flotation provisions, not the empty shipping weight - so size the excavation accordingly per your local code and installer's direction.

Approvals: read this before you buy

This tank is IAPMO certified. Approvals are the most common place a septic purchase goes sideways: a listing that satisfies one jurisdiction may not be the one your county health department or plumbing inspector accepts. Before you buy, confirm with your permitting authority that IAPMO is the certification they require for this installation - cross-border and code-specific scope, including CSA B66 relevance for Canadian installs, is covered in our breakdown of Norwesco IAPMO and CSA B66 septic tank approvals. Verify the required compartment count, burial depth, and inlet/outlet invert heights against your approved system design. Confirm the inlet and outlet adapter size and gasket fitment against that design as well - see the technical drawing on this page for dimensional reference.

Freight

This Norwesco septic tank ships LTL freight, quoted live to your ZIP. We ship from the nearest Norwesco plant: Lancaster, OH; Owego, NY; Tooele, UT; or Washougal, WA. A buyer in the Northeast typically routes from Owego, the Midwest from Lancaster, the Mountain and Plains states from Tooele, and the West Coast from Washougal - the closest plant keeps your freight cost down. Get a live number with our Freight Cost Estimator or call 866-418-1777 and we will quote it for you. List price is before freight; freight is quoted separately to your delivery ZIP.