Sewage system odours inside can suggest a completely dry trap, fractured vent

https://telegra.ph/Important-Pipes-Maintenance-in-Geelong-Drip-Detection-Blocked-Drains-and-A-lot-more-04-17

Drain odours inside can suggest a dry trap, cracked air vent, or partial obstruction; Geelong residential properties with large trees or older sewer lines might need CCTV assessments to situate invasions and avoid reoccuring smells.