The Norwesco 1500 Gallon Two Compartment Septic Tank pairs a low-profile body with two internal compartments and loose plumbing, built for installs where burial depth is tight. At 51 inches tall on a 69 x 157 inch footprint, it sits shallow enough to clear high water tables and rocky cut lines that defeat a taller single-compartment tank, while the two-compartment design separates primary settling from clarified discharge before it leaves the outlet. It is molded in green polyethylene, IAPMO certified, and rated to a 1.0 specific gravity, which is exactly what a domestic septic stream calls for.
Does it work for your install?
Empty, this is a 1,500-gallon vessel; filled, it carries 12,510 pounds of contents at full water weight, and that 12,510-pound figure is also the maximum rated contents weight. Plan your excavation, bedding, and backfill around a loaded weight in that range, and confirm your inlet and outlet inverts against the low-profile 51-inch height before you set the tank. The drawing shows a 20-inch lid carrying a hazardous-gas warning plus the outlet location; septic gas is real, so treat the riser and lid as a confined-space access point and vent the system properly. The dimensioned technical drawing on this page is the authority for the compartment split and access points, so confirm pump-out access to both chambers there before you submit for permit. The footprint runs 69 x 157 inches, and 157 inches is over thirteen feet of tank, so verify gate, driveway, and trench clearance and your trench length before you order. Two planning aids help here: the Tank Sizing Calculator and the Tank Sizing Guide.
Plumbing, compliance, and the mistake to avoid
This tank ships with loose plumbing, meaning the inlet and outlet hardware is supplied for field installation rather than pre-plumbed at the factory, so the most common mistake is treating it as a drop-in connect-and-cover unit. The outlet location is molded into the tank per the drawing; the inlet and vent are field-located and tied in with the supplied loose plumbing. Set the tank dead level, install the plumbing per the drawing, and tie your inlet, outlet, and vent in deliberately. Our walkthrough on tank plumbing system design covers inlet, outlet, and vent tie-ins step by step. The IAPMO listing is the basis for code sign-off, but local acceptance varies, so confirm your AHJ accepts the IAPMO listing before you build the schedule: read Norwesco IAPMO and CSA B66 septic approvals for how that listing maps to US plumbing codes versus Canadian CSA B66 scope. If you are weighing tank configuration, our guide on single compartment vs two compartment septic tanks explains why the second chamber improves effluent clarity, and the Norwesco low-profile series field guide covers procurement and field handling of these shallow-profile bodies.
Specific gravity and service rating
This tank is rated to a 1.0 specific gravity, which covers domestic wastewater and water-weight service. It is not rated for liquids heavier than water; if your contents carry a higher specific gravity, choose a tank with a higher SG rating instead, and use the Tank Sizing Guide to match the rating to your contents.
Freight
This tank ships LTL freight from the nearest Norwesco plant, Griffin, GA, with the rate quoted live to your ZIP. Get your number on the Freight Cost Estimator, or call us at 866-418-1777 to confirm access and offload for a thirteen-foot, multi-ton tank like this one. List price is shown before freight, which is quoted separately to your delivery ZIP.
