Norwesco 40785 — Complete Reference
The Norwesco 40785 is a 500 Gallons septic pump tank in black, molded from polyethylene. Septic pump tank stage — sits between the primary treatment tank and the drain field or effluent line.
This page is the complete reference for the 40785: specs, compatible accessories, installation, freight, and warranty. Every number is sourced from the Norwesco 2024 Liquid Storage Catalog.
At-a-Glance
| Manufacturer Part Number | 40785 |
| Brand | Norwesco |
| Product Class | Septic Pump Tank |
| Capacity | 500 Gallons |
| Material | Polyethylene |
| Color | Black |
| Diameter | 64" |
| Lid / Manway | 20" |
| Shipping Weight | 174 lb |
| Certifications | NSF 61 |
| Warranty | 3-year limited full-replacement |
| Freight Class | LTL, NMFC 156600-02 |
Physical Profile
Single-piece rotomolded construction. Wall thickness is specified by the manufacturer in the engineering drawing linked above.
Typical Applications
- Pump stage between primary and drain field
- Effluent tank in mound systems
- Lift tanks for low-volume residential systems
Installation Checklist
- Install on 6 inches of pea gravel or coarse sand over firm subgrade
- Keep inlet/outlet piping below local frost depth
- Fit risers to grade for inspection and pump-out access (sold separately)
- Fill the tank with water AS you backfill to balance earth pressure on the walls
Shipping & Freight
Ships LTL on a pallet. Residential deliveries need liftgate service. Call with your ZIP for exact freight.
Warranty & Certifications
3-year limited full-replacement. Keep your One Source Plastics order confirmation — it's the warranty-claim trigger. Certifications on file: NSF 61.
When This Product Is the Wrong Choice
- Used as potable water storage — septic tank resin is not FDA-rated
Cross-Reference
| Supplier | Their SKU |
|---|---|
| One Source Plastics | N-40785 |
| Norwesco | 40785 |
FAQ
Is the Norwesco 40785 in stock?
Stock is split across manufacturer warehouses. We pull current inventory when you add to cart; if regional stock is short you'll see a ship-date estimate before checkout.
How fast does the 40785 ship?
In-stock units typically ship within 3 business days of order confirmation. Out-of-stock units build on a 2-6 week cycle depending on the manufacturer. Call 866-418-1777 for a firm date.
Does the 40785 include fittings?
The base tank ships with the manufacturer's standard fitting package. Upgraded bulkheads, flex connectors, or threaded outlets are separate line items — our team confirms fitment before shipping.
What warranty applies to this tank?
3-year limited full-replacement. Keep your order confirmation — it's the claim trigger.
What is the shipping weight and freight class?
Approximately the BC-reported shipping weight. Freight class LTL. At 500 gallons, residential delivery requires liftgate service (+$75-100 typical).
Is this tank permitted in my state?
IAPMO-approved plastic septic tanks are accepted in most states; a small number require concrete-only. Check with your county health department before ordering.
Can I download the technical drawing?
Yes. The branded View Technical Drawing button above your purchase links to the manufacturer's engineering PDF. Also appears in the Additional Information tab.
Questions about fitment, freight, or chemistry?
Our team has the Norwesco catalog in front of them. Call 866-418-1777 or request a quote with MPN 40785 ready.
Related Norwesco Products
Sources: Norwesco 2024 Liquid Storage Catalog. Specs verified against manufacturer-issued engineering drawings. Price and freight subject to change — see current listing above.
