Lesson 1: Water Categories - Identifying the Contamination Level
The first decision on any water loss is classifying the water's contamination level, because it dictates PPE, handling, and whether materials can be saved. Industry standard recognizes three categories.
Category 1 (clean water) originates from a sanitary source: supply lines, melting ice, tub overflows with no contaminants, or appliance water-line breaks. It poses little health risk initially, but it does not stay clean. Category 1 degrades to Category 2 or 3 over time and with temperature, typically within 24-72 hours, or immediately if it contacts contaminated materials.
Category 2 (gray water) contains significant contamination and can cause illness if contacted or ingested. Sources include washing-machine and dishwasher discharge, toilet overflow with urine but no feces, and sump-pump failures. Technicians must use gloves and eye protection; some porous materials may not be salvageable.
Category 3 (black water) is grossly contaminated and may contain pathogens, sewage, or toxins. Sources include sewage backups, toilet overflow with feces, rising surface water, and seawater. Category 3 requires full PPE, antimicrobial treatment, and removal of contaminated porous materials such as carpet, pad, and saturated drywall.
Key principle: category describes water quality, not quantity. Always assume the category can worsen with time, and document the category at inspection because it drives the entire scope and the customer's expectations about what gets removed versus dried in place.