A camera answers the one question that decides the price: what is actually wrong down there. Until someone has looked, every quote for a sewer problem is a guess, and the range between the cheapest real fix and the most expensive one is enormous.
The four common findings
Nearly everything we see in a residential lateral falls into one of four categories, and they carry very different repairs.
Roots
Roots find the joints in clay pipe and grow in through them, then keep growing. Common in older parts of the valley with mature landscaping. Clearing gets you running again; the roots come back on a fairly predictable cycle unless the joint is repaired or that section is replaced.
A separated or offset joint
The pipe has shifted so two sections no longer line up cleanly. Waste catches at the lip. This is a spot repair — dig to that point, fix that joint — and it is usually the least bad news on this list.
A belly
A section has sagged so it holds standing water instead of draining through. Solids settle in the low point. Cabling clears it and it refills, because the shape of the pipe is the problem. Fixing a belly means excavating and re-laying that run at the correct fall.
A crushed or collapsed section
Cast iron that has scaled and flaked through from the inside, or clay that has been broken by ground movement or a vehicle over the line. Replacement of the affected section, and the camera tells you how long that section is.
Why cabling again is a trap
Cabling a main is the right first move. It clears the blockage, gets the house working, and for a one-off clog that is the end of it.
The trap is the third or fourth time. Each individual clearing feels like the cheap choice, and cumulatively they cost more than the inspection that would have told you why it keeps happening — while the underlying problem gets worse.
If a main line has backed up on anything resembling a schedule, the schedule is the diagnosis. Something down there is catching, and it is not going to stop.
The camera also locates the problem, not just identifies it. Knowing the fault is nineteen feet from the clean-out under the side yard is the difference between a targeted excavation and an exploratory one.
When you do not need one
A first-time clog that clears easily and does not come back does not need a camera. One event is one event, and we are not going to sell you an inspection to confirm that nothing is wrong.
A single slow fixture does not need one either. If only the kitchen sink is slow and everything else in the house drains fine, the problem is in that fixture's arm, not in the main.
Where a camera is genuinely worth paying for without any symptoms at all is buying a house — particularly an older one, particularly if there are mature trees between the building and the street. It is a small cost against the one repair on this page that can run into serious money, and the seller's disclosure will not cover what nobody has looked at.