The Norwesco 1250 Gallon Two Compartment Septic Tank (SKU N-43503) is a low-profile, two-compartment underground septic tank molded from polyethylene in Norwesco's signature green, IAPMO certified for plumbing-code-regulated septic installations. At 51 inches tall with a 60 x 157 inch footprint, it is built to sit shallow where a taller tank would force a deeper excavation. It ships with loose plumbing, so the installer sets the inlet and outlet configuration on site. Installers find it under searches like "IAPMO septic tank," "Norwesco low profile," and "low profile septic tank."
Will it work for your install?
This is a 1,250-gallon, two-compartment tank built specifically for the low-profile septic application. The two-compartment design separates solids settling from the clarified effluent that moves toward the drainfield, which is what many jurisdictions require for a primary septic vessel. Per the technical drawing on this page, the documented openings are a single 20-inch access lid for entry and pumping plus one outlet; the inlet and any vent or overflow penetrations are field-cut and sealed by the installer with appropriate bulkhead fittings and gaskets, since the plumbing arrives loose. Before you commit, decide between a single- and two-compartment configuration for your site — our guide on single compartment vs two compartment septic tanks walks through where each is appropriate, and the tank plumbing system design walkthrough covers tying in the inlet, outlet, vent, and overflow correctly.
Sizing and site planning
Filled to capacity, this tank holds roughly 10,425 pounds of water, so the excavation, bedding, and backfill have to be prepared for that load before you set it. The 60 x 157 inch footprint is the trench dimension to lay out, and the 51-inch height is the buried vertical dimension — plan burial depth as 51 inches of tank plus whatever cover your code requires over the lid, which is exactly why this unit suits sites with a high water table or shallow burial depth. Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm 1,250 gallons matches your daily flow and bedroom count before ordering. This tank is rated for septic and wastewater service and carries no published specific-gravity rating for chemical storage; if you need a higher-SG vessel for denser liquids, ask us to cross-reference an SG-rated tank before you order.
The mistake to avoid
IAPMO certification is a plumbing-code listing, not a blanket guarantee that this tank is accepted in your jurisdiction. Many states and counties maintain their own septic approval lists, and Canadian installs are governed by CSA B66 rather than US plumbing codes — confirm with your local health department or building authority that an IAPMO-listed Norwesco tank is accepted before you dig. Our breakdown of Norwesco IAPMO and CSA B66 septic tank approvals explains where each applies, and the Norwesco low-profile series field guide covers procurement and field-operations details for this product line.
This tank ships by LTL freight, quoted live to your ZIP code, routed from the nearest stocking Norwesco plant — St. Bonifacius, MN; Shawnee, OK; Tooele, UT; Washougal, WA; or Lancaster, OH. Get an exact rate with our Freight Cost Estimator, or call 866-418-1777 and we will route it from the closest origin to keep your freight down.
