Case Study: Category 3 Sewage Backup in a Scarsdale Basement, NY

Heavy spring rain overwhelmed the Scarsdale municipal sewer system. The result: 4 inches of Category 3 black water across this homeowner's finished basement, including the entertainment room, wet bar, and adjacent home gym.

Category 3 water means sewage — it's a biohazard. Standard wet-vac extraction is not appropriate. Our crew arrived in full PPE (Tyvek suits, full-face respirators, boot covers, double gloves), evacuated the homeowner to upstairs, and immediately shut down the HVAC to prevent aerosol spread.

Extraction was specialized: pump-out only, no walking through the water, all equipment surfaces double-bagged on exit. We then demolished every porous material the water touched: carpet, pad, drywall to 2 feet above the water line, base trim, and lower cabinetry in the wet bar. All went into sealed biohazard disposal.

EPA-registered antimicrobial treatment was applied to all remaining framing and concrete. Negative air pressure with HEPA scrubbers ran continuously for 8 days. Air quality testing on day 9 showed clearance.

Reconstruction was a dedicated 5-day phase: new drywall, insulation with vapor barrier, carpet, base trim, and finished cabinetry. The homeowner's wet bar got an upgrade in the process.