The Norwesco 1250 Gallon Low Profile Two Compartment Septic Tank is built for installs where burial depth is tight and the standard tall septic profile will not fit. At 51 inches high on a 60 x 157 inch footprint, this IAPMO-certified two-compartment tank holds 1,250 gallons in a low-profile body molded from polyethylene, shipping with loose plumbing so the installer trims and seats the outlet to suit the site. The two-compartment layout separates primary settling from clarified flow, which is what most plumbing-code jurisdictions want to see on a low-profile septic install.
Will it work for your site
Full, this tank carries 10,425 lb of contents, so the bearing pad and the excavation backfill have to be planned for that load across the wide 60 x 157 inch footprint, not a compact one. The specific gravity rating is 1.0, which matches domestic wastewater. That 1.0 is also a ceiling: this is a septic vessel rated for normal wastewater, not for septage, sludge hauling, or any denser liquid - do not press it into a heavier-liquid hauling job. The drawing shows a 20 inch lid carrying a hazardous-gas warning plus the outlet, with the balance of the plumbing loose so the installer sets and seals connections during the set. See the technical drawing on this page for the lid and outlet locations before you finalize the bed. If you are deciding between this and a single-compartment vessel, read Single Compartment vs Two Compartment Septic Tanks, and confirm your capacity against the Tank Sizing Calculator and the Tank Sizing Guide.
Certification and as-shipped configuration
This tank is IAPMO certified, which is the listing many plumbing-code jurisdictions check for a septic vessel. That listing covers the tank as manufactured; because it ships with loose plumbing the installer modifies, keeping the field plumbing code-compliant is the installer's responsibility. Sealing the 20 inch lid and the outlet penetration to code is part of that loose-plumbing scope - the pack carries no gasket spec, so plan to source and seat seals per your local requirement. Whether the IAPMO listing satisfies your authority, and whether you also need the Canadian CSA B66 scope, depends on where you are installing. The Norwesco IAPMO and CSA B66 Septic Tank Approvals guide walks through how the US plumbing-code scope differs from the Canadian cross-border scope, and the Norwesco low-profile series field guide covers field operations and procurement for this body style.
The mistake to avoid
The error on a low-profile septic tank is treating the wide footprint like the tall standard tank's compact one. At 157 inches long, the excavation and the bearing surface run longer than crews expect, and an uneven bed under a 10,425 lb full load can rack the shell or pull the loose plumbing connections out of alignment. Bed the full 60 x 157 inch footprint level and uniformly supported, then seat and seal the outlet during the set. Treat the 20 inch lid as the hazardous-gas access point it is - ventilate and never enter without proper confined-space procedure.
This Norwesco low-profile septic tank ships LTL from the Griffin, GA plant, with freight quoted live to your ZIP. Get a freight estimate from the Freight Cost Estimator or call 866-418-1777 to confirm fit, plumbing, and scheduling before you set the bed.
