How Often Should You Get Your Main Sewer Line Cleaned?

It's the question we wish more homeowners asked us before the backup, not after: how often should the main sewer line actually be cleaned? The answer depends on a few factors — but for most Boston-area homes, the right cadence is roughly every 18–24 months.

The default cadence

For a typical single-family home with PVC lateral, no major trees over the line, and no backup history, a preventative cleaning every 18–24 months is enough to keep the line operating at full diameter and catch any developing issues with a camera if needed.

When you should service every 12 months

• Mature trees within 20 feet of the line (root intrusion)
• Original clay tile or cast iron lateral (joints separate over time)
• Any history of backups in the past 5 years
• Older multi-unit buildings with shared service
• Restaurants and commercial kitchens — at least quarterly

Why preventative service is the cheap option

A scheduled main line cleaning runs in the low hundreds. A single sewage backup costs:

• Emergency dispatch rate
• Cabling or jetting at urgent timing
• Cleanup and sanitization
• Possible flooring/baseboard/drywall restoration
• Possible insurance deductible if covered

One avoided backup pays for a decade of preventative cleanings.

What we actually do on a preventative call

1. Locate and open your main cleanout
2. Run a cable or jetter as appropriate for line condition
3. Restore full diameter — not just punch through buildup
4. Optional camera inspection to document baseline
5. Schedule the next service so you don't have to remember

Local note

Older neighborhoods across Boston, Dorchester, and Weymouth are particularly prone to root intrusion and scale buildup. We've put hundreds of South Shore homeowners on preventative service and they almost never call us in the middle of the night. Be one of them.