Quick answer: A routine main-drain clearing (cabling/snaking through a cleanout) typically runs $150–$500. Hydro-jetting for heavier buildup or roots runs $350–$800+. A camera inspection adds $100–$300. If the line is collapsed or root-damaged, you’re into repair/excavation territory — thousands. The big variable is whether it’s a simple clog or a damaged pipe.
For the wider picture, see what a plumber charges by the job — including the truth about the $49–$99 specials.
A main-line clog is different from a sink clog — it backs up the whole house, often at the lowest drain first. Here’s what clearing it actually costs and how to tell a quick fix from an expensive one.
What it costs
| Service | Typical cost | When it’s used |
|---|---|---|
| Snake / cable through cleanout | $150–$500 | Standard first attempt; clears most clogs |
| Hydro-jetting | $350–$800+ | Grease, sludge, or root buildup; clears full pipe diameter |
| Camera inspection | $100–$300 | Finds the cause/location; essential if it clogs repeatedly |
| After-hours / emergency | 1.5–2× | Nights, weekends, active sewage backup |
| Line repair / excavation | $1,000s | Collapsed, bellied, or root-cracked pipe |
Warning signs it’s the MAIN line (not just one drain)
If it’s only one sink, it’s a local clog — here’s how to clear it yourself →. It’s the main line if you see:
- Multiple fixtures backing up at once (toilet + tub + sink).
- The lowest drain in the house gurgles or backs up when you run water elsewhere or flush.
- Sewage smell or water coming up at a floor drain.
That pattern means call a pro — a homeowner snake won’t reach a main-line blockage.
Not sure which one you’re dealing with? Here’s the two-minute test to tell a local clog from a main line →
What drives the price
- Snake vs. jet. Snaking punches a hole through the clog (cheaper, fast). Hydro-jetting scours the whole pipe (more, but actually cleans it — better for grease).
- Is there a cleanout? An accessible cleanout makes the job fast and cheap. No cleanout costs more. (Where code requires cleanouts.)
- The real cause. A one-time clog is cheap. Tree roots or a bellied/broken pipe mean it keeps coming back.
- Urgency. An active sewage backup at 9 p.m. is the priciest version of this call.
When it’s NOT just a clog
If your main line clogs repeatedly, snaking is just buying time. The usual culprits are tree roots infiltrating joints or a bellied/collapsed section. Pay for the camera inspection — it tells you whether you’re managing a recurring nuisance or facing a line repair. When a job is worth a pro vs. DIY →
At $100–$300 a look, a scope is worth paying for once. If you are on your third one because the roots come back every spring, owning the tool starts to make sense — our sewer inspection camera guide covers what a budget scope actually shows you, and the point where the cheap ones stop being useful.
Roots, a bellied line, grease, or the pipe material itself — here’s how the timing of your backups tells you which one it is →
A plumber’s bottom line
- First main-line clog → a standard snake/cable ($150–$500) is the right call.
- Second clog in the same line → pay for the camera; find the real cause before you keep spending.
- Grease/root history → hydro-jet, don’t just snake.
- DIY scope: homeowner tools are for fixture clogs, not the main line. Drain snake vs. cleaner vs. plunger →
Frequently asked questions
How much does it cost to unclog a main sewer line?
A standard snaking usually runs $150–$500; hydro-jetting for heavy buildup or roots is $350–$800+. A camera inspection adds $100–$300. Collapsed or root-damaged lines mean repair costs in the thousands.
Snaking or hydro-jetting — which do I need?
Snaking clears a single clog quickly. Hydro-jetting scours the whole pipe and is better for grease or recurring root clogs.
Can I unclog a main line myself?
Usually not — homeowner snakes are built for fixture drains, not main lines. If multiple fixtures back up at once, that’s a main-line job for a pro.
Why does my main line keep clogging?
Recurring clogs usually mean tree roots in the pipe joints or a bellied/broken section. A camera inspection finds the cause so you stop paying to snake it repeatedly.
Compare this against 20 other jobs in our 2026 Plumbing Repair Cost Index.