A toilet that overflows with waste, a floor drain that backs up during heavy rain, or a broken sewer line under a slab produces the most hazardous kind of water loss a home can have. Under the IICRC S500 standard this is Category 3, “black water”: grossly contaminated water that may contain pathogenic, toxigenic or other harmful agents. It is handled differently from a clean water loss at every step, and it is not a do-it-yourself job.
Why Category 3 is different
With a Category 1 burst supply line, the goal is to dry materials in place wherever possible. With Category 3, contamination drives the decisions, not moisture. Porous materials that contacted the water are removed regardless of whether they could be dried, because sewage bacteria cannot be reliably cleaned out of carpet pad, drywall, insulation or particleboard. Non-porous surfaces that can be cleaned and disinfected are salvaged.
Category 3 also includes outside floodwater, which carries soil, chemicals and sewage from overwhelmed systems, and water that has sat long enough to support significant microbial growth, regardless of how clean it started.
Safety comes first
Sewage exposure can cause gastrointestinal, skin and respiratory illness. Keep children, pets and anyone with a compromised immune system out of the affected area. Do not run the HVAC system if the return air is in or near the contaminated area, since it will distribute aerosolized contaminants through the house. Technicians work in personal protective equipment, including respirators, gloves and protective suits, and set containment to isolate the work area from the rest of the home.
The cleanup process
- Stop the source. A plumber clears the blockage or repairs the line. Cleanup cannot begin while sewage can still enter the space.
- Containment and controlled demolition. The affected area is isolated. Carpet, pad, affected drywall (typically cut to a clean line above the water mark), insulation and cabinetry toe-kicks that contacted the water are removed and bagged for disposal.
- Extraction and removal of solids. Standing water and debris are extracted and disposed of properly.
- Cleaning and disinfection. All remaining surfaces are cleaned to remove soil, then treated with an EPA-registered disinfectant appropriate for sewage contamination. Cleaning always comes before disinfecting; disinfectants do not work on dirty surfaces.
- Structural drying. Air movers and dehumidifiers dry the framing and subfloor, with moisture readings documented daily as on any water loss.
- Reconstruction. New drywall, insulation, flooring and trim return the space to pre-loss condition.
Contents
Upholstered furniture, mattresses, rugs and paper goods that contacted sewage are generally not salvageable. Hard, non-porous items can be cleaned and disinfected. Everything is inventoried and photographed for the contents portion of your claim before disposal.
Insurance considerations
Standard homeowner policies often exclude water that backs up through sewers or drains unless a sewer backup endorsement has been added. It is one of the least expensive and most valuable endorsements available in North Texas, where aging clay sewer laterals and heavy spring rains make backups common. Check your policy now; the carrier makes the coverage decision at the time of loss.
If you have a sewage backup, keep out of the area and call Fire & Water Restoration Plus at 972-455-8252. We respond 24 hours a day and will coordinate the plumbing repair alongside the cleanup.