The Norwesco 750 Gallon Preplumbed One Compartment Septic Tank (SKU N-43520) is a low-profile, single-compartment polyethylene septic tank molded in green for below-grade installation where burial depth is tight. It measures 51 inches high by 60 inches wide by 92 inches long, giving a 60.0 x 92.0 inch footprint that spreads the tank's load over a wide, shallow excavation instead of a deep one. The tank arrives preplumbed and is IAPMO certified, the listing most plumbing-code jurisdictions look for on a poly septic tank. This page covers what it holds, how it ships, and the one detail most buyers get wrong on a low-profile septic install.
Capacity, dimensions, and preplumbed fittings
This is a 750-gallon septic tank, and the low-profile geometry is the point: at 51 inches tall it fits jobs where a conventional taller septic tank would sit too deep or break grade. The tank comes preplumbed with the outlet assembly already set. The technical drawing on this page calls out the outlet location and a 1-inch top-of-outlet-tee reference, so match those connection points to your drain line before you commit. Use the technical drawing to confirm inlet and outlet invert positions against your line elevations before you set the tank, because on a low-profile body the vertical room for slope is limited and the invert math is unforgiving. For help right-sizing the tank to your daily flow and number of bedrooms, run the Tank Sizing Calculator or read the Tank Sizing Guide.
Certification and the mistake to avoid
IAPMO certification is the listing most code officials want to see on a poly septic tank, but approval is by listing, not by assumption, so confirm IAPMO acceptance with your local health department or plumbing inspector for your specific county before you dig. If you are installing near or across the Canadian border, the distinction between IAPMO and CSA B66 scope matters; our guide on Norwesco IAPMO and CSA B66 septic tank approvals walks through where each listing applies. The single most common mistake on this tank is treating it like a deep-bury cylinder: it is a low-profile design, so backfill and bedding must support the wide, flat footprint evenly and the tank should not be set deeper than the design allows. Norwesco's low-profile bodies are also widely used as hauling tanks, and our Norwesco low-profile hauling tank series field guide covers the same body style in transport service.
Weight and freight
Full, the tank carries 6,255 pounds of water, so the bedding and excavation must be engineered for that loaded weight, not the shipping weight, which is quoted with your freight. This unit ships LTL freight from the Norwesco plant in Shawnee, Oklahoma, quoted live to your ZIP code. Get your exact cost on the Freight Cost Estimator, or call 866-418-1777 and we will quote the delivery and confirm IAPMO listing for your jurisdiction before you order.
