The Norwesco 300 Gallon Septic Pump Tank (SKU N-41319) is a black, polyethylene basin built for the dose-and-discharge stage of a septic system, where effluent collects until a pump lifts it to a drainfield, mound, or downhill leach area. It holds 300 gallons in a compact 54 x 54 x 54 inch cube, so it drops into a tight excavation without the long run a horizontal tank demands. Quick spec line for load planning: 300 gallon capacity, 54 x 54 x 54 inch cube (54 x 54 inch footprint), roughly 2,502 pounds filled with water. Before you dig, run your pump-cycle and reserve volume through our Tank Sizing Calculator and the Tank Sizing Guide.
Will it work for your install?
This is a 300 gallon Norwesco pump tank molded from polyethylene in solid black, which blocks light and keeps the basin shaded for buried service. The base is 54 inches square and the tank stands 54 inches tall, so confirm your hole depth and inlet/outlet invert elevations against the technical drawing on this page before excavation. Filled to capacity with water the tank carries about 2,502 pounds, which spreads across the 54-inch square base at well under one psi on the bedding, but that load still drives your decisions on compacted sand bedding and backfill. One limit to note: this tank carries no published specific-gravity rating, so specify it for septic effluent and water service, not for denser liquids. If you need to store something heavier, call us at 866-418-1777 before you order.
Plumbing and field-cut penetrations
This is a closed-top pump basin, and the penetrations are not pre-cut: the pump discharge, float tree, and electrical conduit are field-cut and field-sealed by the installer. That gives you freedom to lay out the pump, float switches, and discharge riser where your design calls for, but it puts the burden on you to seal every pass-through against groundwater and root intrusion. Match each grommet or bulkhead fitting and its gasket to the discharge pipe outside diameter and to the buried-service conditions on your site, and use the technical drawing on this page to confirm overall dimensions and top access before you cut.
The mistake to avoid
The single biggest error with a 300 gallon pump tank is treating an approval from one jurisdiction as universal. Septic tank acceptance varies by state and, for cross-border work, by Canadian standards that do not map one-to-one onto US plumbing codes. Read Norwesco IAPMO and CSA B66 Septic Tank Approvals to understand how that scope works, then confirm acceptance for your project with your local health department or AHJ before you buy. Second, do not skip the anti-flotation check: an empty buried tank can float in saturated soil, so account for ballast or hold-downs at install on any high-water-table site.
This pump tank ships LTL freight, quoted live to your ZIP, from the nearest of Norwesco's stocking plants: Griffin, GA; Lancaster, OH; Owego, NY; St. Bonifacius, MN; Shawnee, OK; Hanford, CA; Tooele, UT; and Washougal, WA. That plant breadth is what keeps freight down on a 2,502 pound cube for most ZIP codes, since the tank routes from the closest point to you. Get an exact, ZIP-specific rate from our Freight Cost Estimator, or call 866-418-1777 to confirm the nearest shipping point and plan delivery.
