Three-Story Vertical Drain Stack Sewage Backup
Location: Near Plaza West Covina / Glendora Avenue, Plaza District, West Covina, CA
The Scenario: A main drain blockage on a multi-family property forced Category 3 waste water to backup through ground-floor tubs and toilets across 4 residential units.
Equipment Deployed: Heavy-duty truck-mounted extraction, hospital-grade biocides, negative air containment, commercial dehumidifiers.
Psychrometric Drying Log: ATP sanitation swab tests confirmed 100% sterile surface clearance prior to rebuild.
Outcome & Timeline: Complete sanitation, contaminated flooring and lower drywall removal in 48 hours, fully dried in 4 days with clearance testing.