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Soft ground after rain: how do you keep a jobsite porta potty level and pumpable? ✓ Solved

Tyler R.asked 49 viewsConstruction & Job SitesConstruction sitePlacementServicingHolding tankTruck access

Accepted answer

The rental company should place a portable toilet on a stable base, but you must provide one on soft ground. A standard unit weighs about 200 pounds empty and holds up to 70 gallons of waste, so it sinks in mud. Most operators expect level firm ground at delivery. If the site is known to get soft, you need to build a base before the unit arrives. Read the full answer

We're finishing a couple residential builds outside Columbus on lots that turn to soup after a hard rain. Each site has one standard portable toilet for about 8 to 12 guys. The driver drops it on dirt that looks firm, then two days of rain and the unit is listing and the door hangs weird.

Service truck can still get close most weeks, but I'm worried about the unit sinking enough that they can't pump the holding tank clean, or tipping if the next storm hits.

Do rental outfits put plywood or gravel pads under these as standard on soft lots, or is that something we need to build before delivery? And once it starts listing, do they restake and relevel on the next service visit, or do we call for a separate reset?

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Ray M.Dallas, TX

The rental company should place a portable toilet on a stable base, but you must provide one on soft ground. A standard unit weighs about 200 pounds empty and holds up to 70 gallons of waste, so it sinks in mud. Most operators expect level firm ground at delivery. If the site is known to get soft, you need to build a base before the unit arrives.

Use pressure-treated plywood sheets (at least 3/4 inch thick) or a gravel pad about 4 feet square. This spreads the weight and keeps the unit from listing. Once it starts leaning, the driver will try to relevel it on the next service visit if they can safely do so without sinking the truck. If the unit is too unstable or the ground is too soft, they may need to pull it out and reset it on a dry day, which could be a separate trip.

For your crew size of 8 to 12 workers, OSHA 1926.51 requires at least one toilet, so you're compliant. Weekly service is the norm, but heavy rain can make access harder. Keep the access path clear for the vacuum truck, which needs to get within about 25 feet to pump the holding tank clean.

  • Kim S. If the ground is wet when they deliver, ask the driver to place it on the plywood you've laid out. A unit that's level from day one is much less likely to tip later.
3
Deb K.Akron, OH

Ray's right about the base, but rental companies do not always check soil conditions before drop-off. The driver places the unit where you point, on whatever surface is there. If you know the lot turns to mud, build a 4x4 foot pad of 3/4 inch plywood or 4 inches of compacted gravel before delivery. Once a unit lists, the driver will attempt to relevel it during the next service visit if the ground is firm enough to support the unit without sinking further. If the mud is too deep, they note it for a reset on a dry day, which may incur a separate trip fee. Always keep the access path clear for the vacuum truck, it needs solid ground to avoid getting stuck itself.

  • Priya N. If you build a plywood base, screw the sheets together. A single sheet can warp in the mud, and a shifting base is just as bad as a sinking unit.

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