200 Gallon Above Ground Low Profile Septic Job Shack Holding Tank in White

The Norwesco 200 Gallon Above Ground Low Profile Septic Holding Tank is built for job-shack and transport-style septic duty where a full-height tank simply will not fit. The low-profile body keeps the center of gravity down on a trailer or skid, and at 200 gallons it holds roughly 1,668 lb of water when full. Molded from polyethylene with a 1.5 specific-gravity rating, it carries a maximum rated contents weight of 2,502 lb, so it can handle the denser-than-water holding loads it is designed for. This is the white low-profile septic holding tank operators search for under "200 gallon septic," "norwesco holding tank," and "low profile holding tank."

At a glance: 200-gallon capacity · 1.5 SG rating · max rated contents 2,502 lb (vs. 1,668 lb water-full) · 8-inch threaded lid opening · polyethylene.

Will it work for your application

The 1.5 specific-gravity rating is the number to read first. It tells you the tank is engineered to carry contents up to 1.5 times the weight of water, which is why the 200-gallon body is rated to 2,502 lb of contents rather than the 1,668 lb a plain water figure would suggest. Stay inside that contents weight and you stay inside the design. The tank threads for an 8-inch lid, so plan on an 8-inch threaded lid with a matching gasket to seal the access opening for filling, pump-out, and inspection (see the technical drawing on this page for the fitting layout). If you are matching a tank to a specific waste volume or pump-out interval, the Tank Sizing Calculator and Tank Sizing Guide will help you confirm 200 gallons is the right capacity before you commit.

Mounting and approvals

As an above-ground unit, this tank needs proper support across its full footprint. If you are setting it on a pad rather than a trailer or skid frame, our guide on concrete pad sizing for above-ground polyethylene tanks walks through the support framework so the load is carried evenly. For installations near or across the Canadian border, the differences between U.S. plumbing-code acceptance and Canadian approvals matter — see Norwesco IAPMO and CSA B66 septic tank approvals for the cross-border scope before you spec it for a permitted job. Confirm local requirements for your site.

The mistake to avoid

The common error on a low-profile septic holding tank is treating the 1.5 SG rating as headroom you can borrow against — it is the ceiling, not a suggestion. Loading past 2,502 lb of contents, or supporting the tank on only part of its base, is how low-profile tanks get overstressed. Match the contents weight to the rating, support the full footprint, and seal the 8-inch threaded opening with the correct lid and gasket for the access and venting your setup calls for.

This tank ships LTL freight from the nearest Norwesco plant — Shawnee, OK or Sheldon, IA — with freight quoted live from whichever plant is closest to your ZIP. Get your freight quote in seconds with the Freight Cost Estimator, or call 866-418-1777 and we will quote it for you.