Sewage backup is a biohazard emergency that requires immediate professional response. Raw sewage contains bacteria, viruses, parasites, and other pathogens that pose serious health risks to anyone who contacts it. Unlike clean water damage, sewage cleanup (Category 3 water) cannot be DIY'd safely — proper PPE, containment, antimicrobial treatment, and disposal protocols are required. Allied Restoration's biohazard-certified technicians respond 24/7 across the San Francisco Bay Area.

⚠️ Do not attempt to clean up sewage yourself. Raw sewage contains E. coli, hepatitis A, norovirus, and other serious pathogens. Contact with sewage without proper PPE can cause serious illness. Call Allied Restoration at (415) 529-5637 immediately.

What Causes Sewage Backup in San Francisco?

  • Municipal sewer overflow — during heavy rain, San Francisco's combined sewer system becomes overwhelmed and backs up into building drains. This is especially common in older SF neighborhoods with aging infrastructure.
  • Tree root infiltration — root systems from SF's urban trees enter lateral sewer lines and cause blockages
  • Grease buildup — restaurant and residential kitchen grease accumulates in older clay sewer lines
  • Deteriorated lateral lines — older clay or cast iron sewer laterals collapse or offset, causing blockages
  • Multi-unit building issues — foreign objects flushed by other tenants block shared building drain systems
  • Sump pump failure — during heavy rain events, failed sump pumps allow sewage-contaminated water to accumulate in basements

Sewage Cleanup Process

1. PPE & Containment

Technicians suit up in Level B PPE — Tyvek suits, respirators, gloves, and boots. Containment barriers installed to prevent cross-contamination to unaffected areas.

2. Sewage Extraction

Industrial pumps remove standing sewage. Solid waste removed and bagged for regulated disposal. Area cleared before antimicrobial treatment begins.

3. Material Removal

All porous materials that contacted sewage must be removed — flooring, drywall, insulation, and baseboards. These cannot be safely decontaminated and pose ongoing health risk if retained.

4. Antimicrobial Treatment

EPA-registered hospital-grade disinfectants applied to all structural surfaces — concrete, framing, subfloor. Multiple applications required per biohazard protocols. Air scrubbers run continuously.

5. Structural Drying

After disinfection, structural drying equipment deployed to remove residual moisture from concrete, framing, and subfloor. Mold prevention treatment applied.

6. Clearance & Reconstruction

Air quality verification before containment removed. Xactimate documentation submitted to insurance. Full reconstruction of removed materials.

Is Sewage Backup Covered by Insurance?

Standard homeowner's insurance typically does NOT cover sewage backup from municipal sewer overflow or drain backup — this requires a separate water/sewer backup rider that must be added to your policy. However:

  • Sewage from a burst pipe within your home — typically covered under standard policy
  • Municipal sewer backup — requires backup rider (typically $50–$150/yr to add)
  • Sewage in a basement from foundation water — requires separate flood insurance

If you don't have sewage backup coverage, Allied Restoration can still help. We provide transparent pricing and payment plans, and can work with your property management company or landlord if applicable. In rental properties, sewage backup cleanup is typically the landlord's responsibility under California law. Call (415) 529-5637.