The Norwesco 1250 Gallon Two Compartment Septic Tank gives you dual-chamber separation in one molded yellow polyethylene body, IAPMO certified for code-driven onsite installs. It runs 116 inches long by 55 inches wide and stands 70 inches tall, a 55.0 x 116.0 inch footprint to lay out before you dig. If you are deciding between one tank and two stages of settling, the two compartments do that work inside a single excavation - our guide on single compartment vs two compartment septic tanks covers when the second chamber earns its place.
Will it work for your install?
This is a 1250 gallon polyethylene septic tank carrying the IAPMO listing that a plumbing inspector or county health department looks for when signing off on a system. The 116-inch length is also a flow-direction fact: the tank runs inlet to the primary chamber, transfer to the secondary chamber, then out to the drainfield, so orient the long run to your inlet and outlet before the tank goes in the hole - two-compartment tanks get set backwards in the excavation constantly. Full of water it carries roughly 10,425 pounds, so the dig, bedding, and backfill have to be engineered for that load; this is a heavy buried vessel, not a surface holding tank. Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm 1250 gallons matches your daily flow and required reserve before you commit to the excavation.
The mistake to avoid
The biggest error on a buried septic tank is treating IAPMO certification as universal. It is a recognized standard, but acceptance is set locally - some jurisdictions name specific approvals, and Norwesco's IAPMO listing does not automatically equal a CSA B66 listing if you are installing in Canada. Our breakdown of Norwesco IAPMO and CSA B66 septic tank approvals lays out the US plumbing-code scope and the Canadian cross-border picture. Verify the certification your authority having jurisdiction requires for THIS tank before purchase, because a buried tank is not a part you swap out after inspection. The second common miss is hookup: inlet and outlet hub sizing is not pre-set in this listing, so confirm the hub size against Norwesco's installation drawing and your pipe (see the technical drawing on this page) before you cement in adapters, and follow the bedding and backfill instructions, since improper support is what deforms a polyethylene septic tank over time.
Freight
This 1250 gallon septic tank ships by LTL freight from the Norwesco plant in Hanford, California, quoted live to your ZIP code. At 116 inches long and 55 inches wide it will not clear a standard gate or a narrow side yard, and even empty it needs equipment to set into the excavation - plan offload and site access before delivery. Get a real number with our Freight Cost Estimator, or call 866-418-1777 and we will quote the delivery and walk through the offload. List price here covers the tank before freight; we quote the LTL leg separately to your delivery address.
