Dewatering
No survey breaks dewatering out on its own, so there's no margin figure to publish and this page doesn't invent one. What it has is 6 mechanisms that cost dewatering contractors money, and the step that fixes each.
CFMA reports at NAICS level, and dewatering rolls into 238910 Site Preparation along with several other trades. It isn't in the 48-trade master reference either. Every figure on this site traces to one of those two sources, so publishing a margin for dewatering would mean making it up. The nearest published context is the civil and earthwork group, which runs 18% to 24% gross margin and 2% to 10% net profit at $1M–$5M.
6 problems specific to dewatering
The GC has you mobilizing Monday, and you're still waiting on a discharge authorization and an Engineer's stamp on your means-and-methods submittal. Wellpoints, header, pumps, tanks, and fuel are all in play before there's anything to bill, and then you wait 30 days to invoice and longer to get paid. You set up for mass excavation, then the utility run, then the structure, and then you leapfrog the pipe crew down the alignment. You priced pumps, fuel, and rental days against a gallons-per-minute number pulled from borings somebody else paid for, and the subsurface came in wetter.
Each one below points at the item, the unit, the clock, or the party that makes it a dewatering problem, and it says which step fixes it.
| Mechanism | Why it's specific to this trade | Step |
|---|---|---|
| Your Start Date Belongs to the Permit Reviewer | No other trade on that job needs a regulator to approve where its water goes before it can begin, and no other trade has to get its methods reviewed before the first wellpoint goes in the ground. Both of those clocks are held by people who don't answer to you or to the GC's schedule. Your mobilization date is therefore a forecast made by an agency reviewer and an Engineer, while the equipment reservation and the crew are already committed. | Project management |
| The Whole System Runs Before Invoice One | Trades that install progressively spend roughly what they bill each month, so their cash curve tracks the work. Dewatering front-loads the entire system, then converts calendar time into fuel and rental with no additional installed work to point at. That means peak outflow and zero inflow fall in the same month on every single job, which is why this trade's payroll near-misses cluster at the front of the schedule. | Monthly cadence |
| You Priced One Setup and the Job Took Five | Your work is horizontal across the whole site while everyone else's is vertical inside their own footprint, so the thing that gets damaged is a line nobody else is responsible for protecting. The estimate almost always counts one setup because the pay item reads like one setup, even though the schedule contains several. Three to six moves and a flood recovery aren't events other trades price for, so there's no line item waiting to absorb them. | Project management |
| The Geotech Set Your Price and Never Signed It | Other trades price quantities they can measure on a drawing. You price a subsurface behavior somebody else modeled, and the variance between the model and the site conditions falls entirely into fuel and rental, the two lines almost nobody reviews weekly. By the time the overrun is visible in the monthly financials, the pumps have already run the extra days. | Estimating system |
| Drawdown Claims Hit Months After You Demobilize | Your pumping changes the soil under property you were never hired to touch, and no other trade on the job carries that exposure. The claim also runs on a delay, because settlement develops over months while your job closes in weeks. Subsidence and earth-movement exclusions are common in general liability coverage, so the one claim your trade is most likely to see is the one your policy may be written to sidestep. | Overhead calculation |
| Incidental Means Nobody Priced Your Scope | This is the only trade on the job whose entire scope routinely gets buried inside another trade's unit price. An excavation contractor at least has a quantity to bill against, while you carry a cost with no measurable and no adjustment path. That makes the spec's payment language a bigger driver of your outcome than the design, because it determines whether your scope exists as a priced item at all. | Estimating system |
Other civil and earthwork trades
What owners ask
What gross margin should a dewatering contractor run?
Dewatering isn't broken out in any published benchmark, so there's no honest figure to give you. CFMA reports at NAICS level and this trade rolls into 238910 Site Preparation, which mixes it with several others. The civil and earthwork trades that are published run 18% to 24% gross margin at $1M–$5M, and that band is the closest context available.
Why does this page have no benchmark table?
Because publishing a number nobody surveyed would be inventing it. Every figure on this site traces to CFMA or to the 48-trade master reference, and dewatering is in neither. The mechanisms below are what this trade loses money on, and those don't depend on a survey.
What costs a dewatering contractor the most money?
Your Start Date Belongs to the Permit Reviewer. The GC has you mobilizing Monday, and you're still waiting on a discharge authorization and an Engineer's stamp on your means-and-methods submittal. That's one of 6 on this page, and 2 of the 6 resolve to step 06, project management.
Which steps does dewatering keep landing on?
step 06 project management on 2 of them, step 04 estimating system on 2 of them, step 07 monthly cadence on 1 of them, step 03 overhead calculation on 1 of them. That distribution is the install order for this trade, because the step carrying the most mechanisms is the one holding the most money.
What should a dewatering contractor use instead?
Work the mechanisms on this page first, since they're specific and actionable. For a rough sense of the economics, read the civil and earthwork group, which is the nearest published context. Your own job costing beats any industry average once step 01 is installed.
Everything on this page is something you can install yourself, andCONTROL is the order to do it in. If you would rather buy the finished result, SPM The Construction CFO does this work for dewatering contractors as a service. It is a separate firm, Sulphur Prairie Management, LLC, run by the same author.
Wrote CONTROL, the 8 step system these figures sit inside. More about the author.