You have a sewer inspection report in front of you. It’s full of words nobody explained — belly, offset, scale, choked down, corrosion — and a recommendation at the bottom that may or may not be telling you your line is finished.
Here’s what those words actually mean, in plain English, from people who look down these lines every day.
We don’t do repairs and we don’t dig. We can’t sell you a sewer line replacement, so we have no reason to make any of this sound worse than it is — and no reason to talk you out of it if it’s real.
Before anything else: a dirty line can’t be judged
This is the single most important thing on this page.
A camera can only see what isn’t covered. If a line is full of scale, grease, roots and debris, the inspector is looking at the debris — not at your pipe. A great deal of what looks alarming on a first inspection turns out to be the buildup, and the pipe underneath it is sound.
That’s why “clean the line and camera it again” is such a common recommendation. It isn’t a stall and it isn’t a euphemism for bad news. It’s the only honest way to see what you actually have.
Belly, low spot, sag
The word that frightens people most, and usually the least urgent thing in the report.
A belly is a stretch of pipe that has settled lower than the pipe either side of it, so water stands there instead of running through. Colorado’s expansive clay soil moves, and pipe laid in it moves with it. Bellies are common here and most houses of a certain age have one.
Standing water is not a failure. A belly holding half an inch of water is a place where debris gathers, which is a maintenance matter — you clean it out on a cycle and the line runs fine for decades. Cleaning doesn’t remove the sag; nothing short of digging does. It removes what collects in it, which is the part that actually blocks your drain.
A belly becomes a genuine problem when it’s deep enough and long enough to hold solids consistently — and that’s something you can see on camera after the line has been cleaned, not before.
Offsets and joints
An offset is where two sections of pipe no longer line up perfectly. Clay tile was laid in short sections, so there’s a joint every few feet, and those joints were never watertight by design.
A small offset catches paper and lets roots in. That’s a cleaning matter. A large offset — where one section has dropped away from the next and you can see soil — is a different conversation, and an honest camera picture will show you which one you have.
Roots
Roots come in at the joints. They don’t grow through solid pipe wall. Finding roots in a clay line tells you the line is old, not that it’s broken.
They’re cut out mechanically, and they come back — every twelve to twenty-four months is normal for a clay line with mature trees over it. That’s maintenance, the same as a furnace filter. It is not a reason to replace a functioning sewer line.
Scale, scum, corrosion, “choked down”
This is the finding most often mistaken for a failed pipe.
Cast iron builds up a hard crust on the inside over decades — mineral scale, grease, and corrosion product. It narrows the opening, sometimes dramatically. On camera it looks like the inside of a cave, and reports describe it as heavy scum, choked down, or restricted.
Scale comes off. Carbide flex-shaft milling cuts it back to bare pipe wall, and a line that looked half-closed goes back to full diameter. We do this routinely. What the pipe looks like underneath is the actual question, and you can’t answer it until the scale is gone.
“The cast iron is very black on the bottom”
The bottom of a cast iron pipe sits in the flow, so it corrodes first. A dark channel along the bottom is what a hundred-year-old iron pipe looks like. It may mean the wall is thinning. It may just be staining over sound metal.
Nobody can tell you which through a layer of scale. Clean it, camera it, then decide.
Cracks
Reports distinguish between a hairline crack and a structural one, and the difference matters enormously. A symmetrical hairline crack in clay, with the pipe still round and holding its shape, is extremely common and often has no effect on how the line runs.
A crack with the pipe deformed around it, or one you can see soil through, is real.
Orangeburg
If your report says Orangeburg, that’s the one on this page where we’ll tell you straight that cleaning is not the answer.
Orangeburg is tar-impregnated wood fibre pipe, laid mid-century. It doesn’t crack — it deforms, going oval and then flat under the weight of the soil. It has no long-term future and no amount of cleaning changes that. We still find it in the metro area now and then.
The footage numbers
Findings are logged by distance from where the camera went in — so “bellies from 45′ to 50′” means forty-five to fifty feet along the line from the clean-out. Useful for knowing whether something is under your basement slab or out under the lawn, which makes a large difference to what any repair would cost.
The total footage tells you how far it is to the city main. Most metro lines run somewhere between sixty and a hundred and forty feet. If a company tells you your blockage is unreachable, ask how much cable they carry — we run 125 feet as standard and have cleared blockages past two hundred.
What genuinely does mean replacement
We’d rather tell you this plainly than have you think we say yes to everything:
- Orangeburg pipe
- A collapsed section — the pipe has lost its shape and the camera can’t pass
- A separated joint with soil coming in, or a visible void around the pipe
- Cast iron actually holed through, seen after cleaning
- A belly deep enough and long enough to hold solids no matter how often it’s cleaned
If that’s what you’ve got, we’ll show you on camera and point you to R.C Pipeline (303-597-8396), who do underground sewer repair and replacement. BBB accredited, A+ rated. We don’t take a referral fee — the moment money changes hands for a recommendation, the recommendation is worth nothing.
If your inspection came from Sewer View
We won’t sell you a second one. You’ve already paid for an inspection and a video, and charging you again for the same thing would be taking advantage of a bad week.
We still put our own camera down the line before and after we clean it — that’s how we work on every job, and it’s how we know the cleaning did what we said it would. We just don’t charge you for it.
Why you can take our word for it
There’s a saying in the drain cleaning trade: if you do maintenance and repair, you cannot stay honest. We decided a long time ago to take that seriously.
We only do maintenance — cleaning, jetting, milling out scale, cutting roots and camera inspection. We don’t replace sewer lines and we don’t dig. So when we read your report and tell you it describes a line that needs cleaning rather than replacing, we aren’t turning down work. We never had it to sell.
And the fair question back is whether we’d call a line fine when it isn’t, since cleaning is what we do sell. That’s what the camera is for. We put one down every line before we start and again after we finish, and the footage is yours to keep — permanently, including the parts that argue against us.
If you’re in the middle of a sale
A lot of these reports land during a real estate transaction, with a deadline attached and a number in the buyer’s head that came from somewhere else.
We’re NASSCO certified, so our inspection comes with a written report and video — the documentation lenders, title companies and the other side’s agent will accept. It says what’s there, whether that’s good news or bad. More than one deal has been settled by a clean post-cleaning report showing the line was never the problem.
Bring us your report
Call and read it to us. Cam answers the phone and will get you to the right person. Estimates are free, our prices are published, and there’s no trip charge in metro Denver or Aurora.
Family owned and operated, and run on one rule: do unto others as you would have them do unto you. That’s why we’ll tell you when you don’t need the work.
Mon–Fri 8:00am–5:00pm. Free estimates across the Denver metro area.