When we take a call here with multiple drains backing up, the first instruction is to stop using water in the house — especially the washing machine, which discharges a large volume quickly and pushes waste up through the lowest opening in the building.
Once it has surfaced, it is a Category 3 loss and it is handled as one: containment, extraction, removal of porous materials that absorbed it, cleaning before disinfection, then drying and verification. Carpet and pad that took sewage do not stay. That is an IICRC health standard, not an upsell.
The cause repair — clearing the line, and where the joints are badly compromised, lining or replacing the lateral — is a plumbing scope, and we coordinate it.
The preventive advice for this neighbourhood is straightforward: if your house is original and your street has big mature trees, a camera inspection of the lateral every few years costs a fraction of one Category 3 cleanup. Root intrusion is manageable when you know about it.