Why Is My Toilet Gurgling?

A gurgling toilet is caused by air being forced through the water in the toilet's trap, creating bubbles and that distinctive gurgling sound. It happens when there's a pressure imbalance in the drainage system downstream — most commonly caused by a partial blockage, a vent pipe problem, or a structural defect in the underground drainage.

What to Look For

• Gurgling after flushing: likely a partial blockage in the soil pipe or main drain
• Gurgling when running a sink or bath: shared waste pipe issue or poor venting
• Random gurgling without water use: possible sewer surcharge or neighbour's usage
• Gurgling getting worse over time: blockage or collapse developing
• Bubbles visible in the bowl: significant air displacement — needs investigation
• Gurgling with slow flush: combined issue — blockage reducing flow and trapping air

How We Diagnose the Problem

We check the toilet's vent pipe, soil stack, and underground drainage in sequence. CCTV inspection of the underground section reveals partial blockages, collapsed sections, or root ingress that are causing the air pressure problems.

How We Fix It

Simple vent fixes are quick and inexpensive. Partial blockages are cleared with jetting. Structural problems in the underground drainage require relining or excavation. We fix the cause of the pressure imbalance, not just the symptom.