If your kitchen sink, bathroom shower, and toilet are all draining slowly at the same time, the problem is likely in the main line.
| Symptom | What it means | |---------|----------------| | Multiple drains clog at once (e.g., toilet + shower + sink) | Backup in the main line | | Gurgling sounds from toilet or drains | Air trapped by water backing up | | Water backs up into other fixtures when you flush or run a sink | Blockage downstream | | Sewage smell near floor drains or yard | Crack or overflow in main line | | Lush, wet patch in yard above pipe | Leak or break | | Sewage pooling in basement floor drain | Severe blockage | main sewer line clog