How often should you clean a sewer line?
Updated July 2026
Snake or hydro-jet the main sewer line every 18 to 24 months if you have mature trees near the line or a history of root intrusion; homes with newer PVC and no root problems can go much longer or simply wait for symptoms. Roots are the driver: they seek the moisture and nutrients at pipe joints, work in through tiny gaps, and grow into a mesh that snags waste until the whole line backs up. A preventive cleaning runs a few hundred dollars, while a collapsed line is a $3,000 to $25,000 replacement.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Old clay or cast-iron line with big trees | Every 12–18 months | Root-prone joints and rough walls snag debris |
| Recurring slow drains or past backups | Every 12–18 months | A known problem line needs to stay ahead of the next clog |
| Mixed-age pipe, some mature trees | Every 18–24 months | Moderate risk; camera-inspect to confirm the interval |
| Newer PVC, no trees, no history | Every 3–5 years or by symptom | Smooth, jointed PVC resists roots and buildup |
| Big household or heavy grease | Every 12 months | Grease and volume build up fast in any line |
| Gurgling toilets or sewage at floor drains | Clean now | The line is already backing up; do not wait for the schedule |
| Before buying an older home | Camera inspect first | A scope reveals roots and cracks before they are yours |
The cost of skipping it
What skipping it costs: a routine snaking runs $150 to $400 and hydro-jetting $350 to $800, both cheap next to what a neglected line does. Roots and grease build until raw sewage backs up into the lowest drains, tubs, and floor drains, a biohazard cleanup on its own. Keep ignoring it and roots crack the pipe or it collapses, and now you are excavating: a sewer line replacement commonly runs $3,000 to $25,000 depending on depth and length. A camera inspection first tells you which camp you are in; see how often to camera-inspect a sewer line.
How to do it (Pro job · $150–800)
- Watch for early signs: several slow drains at once, gurgling toilets, or a sewage smell near floor drains.
- Locate your main cleanout, a capped pipe in the basement, crawlspace, or yard near the foundation.
- For a known root problem, book a plumber to camera-scope the line and confirm the cause first.
- Choose the method: a rooter blade cuts roots and clears clogs; hydro-jetting scours grease and scale from the walls.
- For recurring roots, ask about a follow-up interval and whether a damaged section needs lining or repair.
- Log the cleaning date and set the next one 18–24 months out if trees or roots are in play.
Knowing the interval is the easy half. OnOtto reminds you at the right interval, and it won't let you snooze it into next year. Tasks persist until they're done, and completing sewer line cleanings schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
Snaking vs hydro-jetting: which do I need?
They solve different problems. A rotating snake or rooter blade cuts through roots and punches open a clog, restoring flow fast and cheaply at $150 to $400, but it leaves residue on the pipe walls. Hydro-jetting blasts the line with high-pressure water, scouring off grease, scale, and root remnants for a fuller clean at $350 to $800. For a one-off root clog, a snake is enough; for grease buildup or to reset a chronically slow line, jetting lasts longer. A camera scope helps a plumber recommend the right one.
Can I clean the main sewer line myself?
You can rent a drum auger and clear minor clogs, but the main line is usually a pro job. Consumer augers rarely reach far enough or cut heavy roots, and the wrong tool can pack a clog tighter or damage older clay pipe. Hydro-jetting in particular needs professional equipment and judgment about pipe condition. For a slow kitchen or bath drain, DIY away; for the main line, roots, or repeated backups, hire a plumber who can camera the line and confirm what is actually happening.
How do I keep tree roots out of the sewer line?
You cannot fully stop roots near an old jointed line, but you can slow them. Root-killing foams containing dichlobenil coat the pipe and set roots back for months; copper sulfate is cheaper but harsher. Keeping the line on a regular cleaning schedule stays ahead of regrowth, and a camera inspection shows where roots enter. The permanent fix is relining or replacing the affected section, which costs more up front than a cleaning but far less than the $3,000 to $25,000 excavation after a full collapse.