Sewage water damage is any water in the home that contains or has touched human waste, from a toilet overflow with waste, a backed-up sewer line, or a floor drain pushing water up. The industry calls it Category 3 or black water, the most contaminated class, and it requires removal of porous materials and full cleaning, not just drying.
| Category | Example | How it's handled |
|---|---|---|
| Category 1 (clean) | Supply line, toilet tank water | Usually dried in place |
| Category 2 (gray) | Washer discharge, toilet bowl overflow with urine only | Cleaned and dried; pad usually removed |
| Category 3 (black) | Sewer backup, toilet overflow with waste, storm water from outside | Porous materials removed, surfaces cleaned and disinfected |



