Sewage Cleanup Sydney: What to Do When Sewage Backs Up Into Your Property

When sewage backs up into a Sydney home or business, the instinct is often to grab a mop and start cleaning. This is one of the most dangerous things you can do. Sewage is classified as category 3 contaminated water — the highest risk level in the restoration industry — and it poses serious, immediate risks to health. Here is what you need to know and what to do.

Why Sewage Backup Is a Health Emergency

Raw sewage contains a complex mix of biological hazards:

• Bacteria: E. coli, Salmonella, Campylobacter, and Leptospira
• Viruses: Hepatitis A, norovirus, and rotavirus
• Parasites: Giardia and Cryptosporidium
• Toxic gases: Hydrogen sulphide and methane

These pathogens can cause serious illness through ingestion, skin contact, or inhalation. Even surfaces that have been in contact with sewage-contaminated water but look clean can harbour bacteria. This is why professional sewage cleanup — not household disinfectant — is the only safe response.

What to Do Immediately After Sewage Backup

1. Evacuate the affected area immediately — do not walk through sewage water or let children or pets near it
2. Turn off any HVAC, fans, or air conditioning — this prevents contaminated air and droplets from spreading to other areas
3. Do not use any fixtures connected to the blocked drain — toilets, sinks, and showers in the affected area must not be used until the blockage is cleared
4. Call your plumber to identify and clear the source blockage
5. Call Flood Services Sydney on 02 9167 9435 — we arrive within the hour and handle the full decontamination and restoration
6. Notify your insurer and document the damage with photos before any cleanup begins

What the Professional Sewage Cleanup Process Involves

Our certified technicians follow a strict protocol for every sewage event:

1. Hazard assessment and PPE: Full protective equipment — coveralls, respirators, gloves, and eye protection — before entering the contaminated zone
2. Containment: Plastic sheeting and negative air pressure to prevent cross-contamination to unaffected areas
3. Extraction: Removal of standing sewage water using industrial extraction equipment
4. Material removal: All porous materials that have been contaminated — carpet, underlay, plasterboard — are removed and disposed of in accordance with NSW EPA guidelines
5. Deep sanitisation: All non-porous surfaces are treated with commercial-grade biocidal disinfectants proven effective against the specific pathogens present in sewage
6. Drying: Industrial air movers and dehumidifiers to return the property to dry, safe conditions
7. Post-treatment testing: Surface and air quality sampling to confirm decontamination is complete before we clear the property for re-occupation

If the sewage event has been left untreated for any length of time, mould will have begun to develop. Our team integrates mould remediation into the scope wherever needed, ensuring no secondary problems develop after the sewage contamination is resolved.

Common Causes of Sewage Backup in Sydney Properties

Sewage Cleanup and Your Insurance Policy

Whether your insurer covers sewage backup depends on your policy wording. Look for terms like “escape of liquid”, “drain overflow”, “sudden water damage”, or a specific “sewage and drain backup” endorsement. If your policy includes these, you may be covered — call your insurer immediately.

Flood Services Sydney provides detailed biohazard reports, scope of works, and before-and-after documentation that meets the evidentiary requirements of all major Australian insurers. We also handle the complete water damage restoration scope in a single engagement, so you are not coordinating multiple contractors while dealing with an already stressful situation.

Frequently Asked Questions