In the restoration industry, “Category 3” or “Black Water” refers to floodwater contaminated with sewage, heavy metals, or toxic runoff common in Seattle storm surges. Unlike a clean pipe burst, this water is biologically active. At Basement Expert, we treat these floods with hospital-grade disinfectants and specialized extraction protocols. Entering a Category 3 flood without professional PPE can lead to severe respiratory and skin infections. Our crew of four ensures the environment is fully decontaminated before structural drying begins.