Why Do My Drains Keep Clogging?
A drain that clogs over and over almost always has a cause that was reduced but never removed. The fix depends on what’s actually building up, and where.
Common Causes of Recurring Drain Clogs
Symptom-to-Likely-Cause Table
| Symptom | Most Likely Cause | Typical Location |
|---|---|---|
| One kitchen sink drains slowly or clogs repeatedly | Grease and soap buildup | Branch line near the P-trap |
| One shower or tub drain clogs again after snaking | Hair and soap scum | P-trap or short trap arm |
| Multiple drains back up at the same time | Main line blockage or partial obstruction | Main drain line |
| Lowest drain backs up when toilet flushes | Main line or sewer-side blockage | Main drain or lateral line |
| Slow drains throughout the house, worsening gradually | Hard water scale buildup | Multiple branch lines |
| Clog returns within days near an older section of pipe | Root intrusion or pipe damage | Main line or lateral line |
Prevention Checklist for Fewer Recurring Clogs
Frequently Asked Questions
Why does the same drain keep clogging after snaking?
Snaking often breaks through a clog without removing the grease, scale, or soap coating around it, so the material rebuilds quickly.
When is hydro jetting worth it over snaking?
Generally when a drain has clogged more than once in the same location, or when grease, soap scum, or scale is coating the inside of the pipe rather than a single blockage.
Can multiple slow drains mean a sewer problem?
Yes. When two or more drains slow down or back up around the same time, it often indicates a blockage in the shared main drain line.
Should I use chemical drain cleaner for a recurring clog?
Chemical drain cleaners don’t address scale, roots, or a main-line blockage, and repeated use can complicate later diagnosis or repair.
Can hard water make drain clogs worse?
Yes. Queen Creek Water Services reports hardness of roughly 6–17 grains per gallon, which deposits scale inside pipes and narrows the drain over time.
When is a sewer camera needed?
Typically when a clog keeps returning in the same spot, when multiple drains are affected, or when root intrusion or pipe damage is suspected.
How to tell a drain clog from a sewer problem?
A single slow fixture is usually a local drain issue. Gurgling from unused drains or multiple fixtures backing up together points toward the main line.