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Can a porta potty sit on a slope if it is shimmed, or does it need to be flat?

Luis A.asked 7 viewsDelivery, Placement & ServicingLevel groundPlacementStandard unitService visitTruck access

We have a ranch with seasonal crews and a guest cabin, no septic. The only spot for a portable toilet has a noticeable slope, maybe a 10-degree grade. It's firm ground, no mud, and a vacuum truck can drive right up to it. I'm renting a standard unit for about 10 people over the summer, with weekly service. I've seen people shim porta potties with wood blocks to level them out. Does that work, or does it need to be truly flat? What happens if it's not level, does it affect the holding tank or the door? And will a rental company even place it on a slope if I shim it?

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Tyler R.Columbus, OH

A standard portable toilet needs to sit level, not just propped until it looks upright. On a firm 10-degree grade you can usually get there with wood blocks under the downhill skids, but the cabin has to end up plumb so the door latches and the tank fluid sits even.

If the unit stays tilted, the door hangs open or swings shut on its own, liquid pools on the low side of the tank so the fill looks wrong, and the floor feels tippy when someone steps in. A weekly service visit still works as long as the vacuum truck can reach the unit and the cabinet does not rock while the driver pumps.

Most crews will place a standard unit on a slope when the ground is firm and they can level it with blocking before they leave. Tell them about the grade when you book so they bring enough wood and do not refuse the spot on arrival. Ask them to set blocks under the downhill skid until a bubble level on the floor reads flat. Do not leave it on a noticeable lean for the whole summer.

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