The Norwesco 500 Gallon Plastic Septic Pump Tank is a black polyethylene chamber built to hold and discharge effluent in a pumped septic system - the dosing or pump chamber that lifts wastewater to a drainfield, mound, or downhill leach area where gravity alone won't carry it. At 67 inches tall on a 64 by 64 inch footprint, it gives you 500-gallon nominal capacity in a compact pad. If you searched "norwesco 500 gallon septic pump tank" looking for a dependable poly chamber to seat a pump and floats, this is the unit.
Will it work for your system?
This tank measures 67 in. high, 64 in. wide, and 64 in. long, sitting on a 64.0 x 64.0 in. footprint and carrying roughly 4,170 lb when filled with water - three numbers to hand the installer sizing your excavation, bedding, and lifting equipment in one place. Plan that pad and backfill around the loaded weight, not the empty 500-gallon rating. Norwesco molds this tank in polyethylene; the listing does not publish a specific-gravity rating for it, so treat it as a water and domestic-wastewater pump chamber rather than a vessel rated for heavier-than-water liquids. No fittings, gaskets, floats, or pump are spec'd in this listing, and none ship pre-installed - inlet, outlet, and access locations and sizes are not published here, so read them off the technical drawing on this page and match them to your pump, float, and discharge kit before you cut or order anything. To sanity-check that 500 gallons is the right dosing volume for your flow, run the numbers through our Tank Sizing Calculator or read the Tank Sizing Guide.
Approvals and where it fits
Septic approvals are not uniform across jurisdictions - what passes plumbing inspection in one state or province may need a different listing next door. If you're installing in Canada or near the border, our guide on Norwesco IAPMO and CSA B66 Septic Tank Approvals walks through the Canadian cross-border scope versus US plumbing codes so you can confirm this 500 gallon tank meets your local code before the inspector arrives.
The mistake to avoid
The most common error on a pump tank this size is treating it like a buried storage tank and skipping the loaded-weight and buoyancy math. A 500-gallon chamber that weighs about 4,170 lb full still wants to float when the surrounding soil saturates and the tank runs near empty between dosing cycles - so follow Norwesco's burial and anti-flotation guidance for your water-table conditions. The second mistake is ordering floats, a pump, and discharge fittings before verifying the access and outlet layout on the technical drawing; pump-tank penetrations are not one-size-fits-all, and nothing in this listing fixes their location for you.
This tank ships LTL freight, quoted live to your ZIP from the nearest Norwesco plant - St. Bonifacius, MN; Owego, NY; Tooele, UT; or Washougal, WA - so your rate reflects the shortest lane to your site. Get a real number in seconds with our Freight Cost Estimator, or call 866-418-1777 and we'll quote it and confirm the right pump-tank configuration for your install.
