A 1000 gallon two compartment septic tank for Arizona, California, Nevada and New Mexico
The Norwesco 1000 gallon two compartment septic tank, part number 44475, is a yellow polyethylene tank 102 inches long, 60 inches wide and 63 inches tall, weighing 320 lb empty. Two compartments means a wall inside the tank splits it into a settling chamber and a clarifying chamber, which many health departments now require for a new system. It comes with a 4 inch gasketed PVC tee assembly at the inlet and at the outlet and a 20 inch gasketed manway. Norwesco lists the tank as IAPMO approved, lists state septic approval for Arizona, California, Nevada and New Mexico, and rates it to 130 F. It is built at Norwesco's Hanford, California plant.
Will the county sign off on it? Call 866-418-1777 with the permit requirements, get freight to your ZIP and add it to your cart above, or request a written quote.
Why two compartments
In a single chamber tank, solids settle and scum floats in the same space the outlet draws from, and a surge from a washing machine can push solids toward the drainfield. A two compartment tank takes the raw flow in the first chamber, lets most of the solids drop there, and passes calmer water into the second chamber before it reaches the outlet tee. The drainfield lasts longer for it. Our comparison of single compartment and two compartment septic tanks walks through when a code requires the second chamber and when it is simply the better choice. Approvals come next: Norwesco's IAPMO listing and the four state approvals are what the inspector will ask to see, and our note on Norwesco IAPMO and CSA B66 septic tank approvals explains what each covers. For another state, call us; Norwesco sells the same two compartment tank under other part numbers with other approvals.
Openings and fittings
- Inlet and outlet. A 4 inch gasketed PVC tee assembly at each end, ready for 4 inch drain pipe. The inlet tee drops the flow below the scum layer; the outlet tee draws from below it. Both go in before the system is used.
- Manway. A 20 inch gasketed manway with a 20 inch lid. Below grade, the gasket keeps groundwater out and septic gas in. Ask us about risers if the tank will sit deep enough that the lid needs bringing up to grade.
- Drawing. Norwesco's drawing for this tank, linked under Technical Drawing on this page, shows the baffle wall position, the invert heights of the inlet and outlet and the manway layout. Hand it to the installer with the permit.
Sizes nearby
If the code only needs one chamber, the 1000 gallon one compartment septic tank is the same size tank without the baffle wall, and the 1000 gallon Norwesco septic tank 41721 is another version of this capacity. Norwesco also builds the 1000 gallon two compartment septic tank 41720 at other plants with other state approvals. One size down is the 750 gallon one compartment septic tank; one size up is the 1250 gallon one compartment septic tank. The tank sizing calculator and tank sizing guide cover sizing by bedrooms and daily flow.
Shipping, receiving and setting
The tank ships LTL from Norwesco's Hanford, California plant, 102 by 60 by 63 inches on the truck. The listed price is before freight; the freight cost estimator gives the lane cost to your ZIP. At the tailgate, check 44475 on the bill of lading against the moulded number, look at both tee assemblies and the manway gasket, and walk the shell before you sign. Set it on the bedding Norwesco's installation instructions call for, and fill both compartments with water as you backfill so the walls and the baffle stay in shape; 1000 gallons of water weighs 8340 lb, and that water is what holds the tank round while the backfill goes in. Keep vehicles off the ground above it.
Questions before you order? Call 866-418-1777 with the permit in hand.
Freight and documents
Ships from: Hanford, CA. LTL freight is quoted to your ZIP with the freight cost estimator or by phone at 866-418-1777. The listed price is before freight.
Technical drawing (PDF) for Norwesco 44475.
See this tank
Product video. Watch the Norwesco 1000 Gallon Plastic Two Compartment Septic Tank - IAPMO Certified video (69 seconds) with dimensions, fittings and shipping notes.
Ready to order?
Add it to your cart at the top of this page, get LTL freight to your ZIP, request a written quote, or call 866-418-1777. The listed price is before freight.
