The Norwesco 1500 Gallon Two Compartment Septic Tank is IAPMO-certified and built for below-grade wastewater service. It measures 135 inches long by 55 inches wide by 70 inches tall, with two internal compartments molded into a single polyethylene body. The yellow polyethylene construction is what septic installers across the country specify when they search for a norwesco septic tank in the 1500 gallon class.
Will this tank work for your install?
The two-compartment design separates primary settling from the secondary clarification stage, which is the configuration many jurisdictions require for newer septic systems. If you are weighing this against a single-tank layout, read our guide on single compartment vs two compartment septic tanks before you finalize the system. The footprint is 55.0 x 135.0 inches, so confirm your excavation and bedding plan accommodate the full 135-inch length. Use the Tank Sizing Calculator and our Tank Sizing Guide to confirm the 1500-gallon capacity matches your projected daily flow and required reserve.
Certification and code scope
This tank carries IAPMO certification. Septic approvals are not universal across jurisdictions, and Canadian cross-border requirements differ from US plumbing codes. Before you commit, review Norwesco IAPMO and CSA B66 Septic Tank Approvals to understand exactly what the certification covers and confirm it satisfies your local authority's plumbing code. The common mistake on a tank this size is assuming a certification accepted in one state or province carries to the next - verify with your local inspector first. Inlet, outlet, and riser configuration vary by certification region and plant, so call 866-418-1777 to confirm fittings before you order.
Dimensions, weight, and the load-out plan
Plan the excavation for both dimensions: at 70 inches tall, the dig depth has to clear the full tank body plus required cover and bedding per your local code, and at 135 inches long the trench has to seat the whole footprint. Filled to capacity this tank carries 12,510 lbs of water weight, so sequence your backfill and water load carefully - a partially buried tank should never be filled ahead of proper bedding. That 12,510 lb figure is the full in-service load, not shipping weight; the tank arrives dry and light for its size, but its 135-inch length is what drives the LTL and offload requirement, so have equipment ready to receive it at the jobsite.
This tank ships LTL freight, quoted live to your ZIP from the nearest Norwesco plant - Griffin, GA; Lancaster, OH; Owego, NY; Shawnee, OK; St. Bonifacius, MN; Tooele, UT; or Washougal, WA. Get an exact freight quote with our Freight Cost Estimator, or call 866-418-1777 to confirm offload requirements and lead time for your delivery.
