The Norwesco 1250 Gallon Two Compartment Septic Tank (N-41754) is a polyethylene primary treatment tank built for residential and light-commercial onsite wastewater systems, and it carries the approval credentials that matter for cross-border installs: it is IAPMO certified and approved for use in Canada. The blue tank holds a nominal 1,250 gallons split across two internal compartments, measures 116" long by 55" wide by 70" high, and includes two manhole openings for service access. If you are scoping a septic project where the inspector wants a third-party listing on the tank itself, this is one of the Norwesco septic tanks that answers that question on paper.
Will it work for your system?
The two-compartment design separates settling from clarification, which most modern septic codes prefer over a single large chamber, and the two manholes give you direct access to each compartment for pumping and inspection rather than fishing through one lid. The pack does not specify the compartment volume ratio, so confirm the split your code and designer require against the system drawn up for your site - see our single compartment vs two compartment septic tank guide for how that choice is made. Inlet/outlet and any tee or baffle configuration are shown on the technical drawing on this page; confirm invert heights and pipe sizes against that drawing and your authority having jurisdiction before you excavate. For overall capacity planning across the household or building, the Tank Sizing Calculator and Tank Sizing Guide will help you size the system correctly.
Footprint, weight, and what to plan for
The tank's footprint is 55.0" x 116.0", so dig and bed your excavation to that plan dimension plus working clearance. Plan your handling around weight at service load: filled with water this tank carries roughly 10,425 lb, so the excavation, bedding, and backfill have to be specified for a tank operating at that mass. Empty, it sets by hand with a small crew, but the tank must be bedded and backfilled per Norwesco's installation instructions - uneven bedding or improper backfill is the most common septic install mistake and it can deform or shift a poly tank. Follow the technical drawing on this page for manhole locations, inlet/outlet positioning, and burial detail.
Approvals and the cross-border detail
The single warning to read first: an IAPMO listing is not automatic acceptance by your authority having jurisdiction - verify before you buy. This unit is IAPMO certified and approved in Canada, which is the specific reason buyers reach for it over a standard septic tank, but that approval scope is not identical to every US state plumbing code or every Canadian provincial requirement. Confirm the specific approval your jurisdiction requires - our Norwesco IAPMO and CSA B66 Septic Tank Approvals guide breaks down where the IAPMO certification applies versus where CSA B66 or a US plumbing code governs.
This septic tank ships by LTL freight from the nearest Norwesco plant - Lancaster, OH; Owego, NY; or Washougal, WA - with freight quoted live to your ZIP. Get your freight quote with the Freight Cost Estimator, or call 866-418-1777 and we'll confirm the nearest shipping point and walk through delivery and offload for a tank of this size.
