Sewage backup cleanup in King County

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King County's aging sewer infrastructure - combined sewers in Seattle, undersized laterals in Kent, root-choked clay lines across the Eastside - backs up when the rain hits hard. A sewage backup isn't "dirty water." It's Category 3 black water: bacteria, viruses, parasites, endotoxins. Porous materials (carpet, pad, drywall, insulation) that absorb it cannot be cleaned - they must be removed. The health risk is real: hepatitis A, E. coli, giardia, norovirus.

What a visit covers

• Emergency extraction of standing sewage with truck-mount or portable units
• Removal and disposal of all contaminated porous materials
• HEPA vacuuming and antimicrobial treatment of structural framing and subfloor
• Containment and negative air to prevent cross-contamination
• Crawl space and basement sanitization - soil treatment if raw sewage soaked the ground
• Post-remediation verification (ATP testing, moisture clearance)

When it's a bigger problem

A toilet overflow caught in 30 minutes is contained. A main line backup that filled the basement, soaked the furnace, and ran for hours while the homeowner was at work - that's full demo, HVAC replacement, possible foundation wall cleaning. The crew that calls you back scopes the vertical and horizontal migration, writes the protocol, and coordinates the plumber for the line repair/replace so the backup doesn't recur.

What it costs

Sewage cleanup is the highest per-square-foot mitigation cost. The crew that calls you back gives the real number once they know the square footage, materials affected, and whether HVAC was involved. Most homeowner policies cover sewer backup only if you purchased the endorsement (typically $50-150/yr).