Category 1: Category 1 water originates from a sanitary water source and does not pose substantial risk from dermal, ingestion, or inhalation exposure.
Example: Sink overflow
Category 2: Category 2 water containing significant contamination and has the potential to cause discomfort or sickness if contacted or consumed humans.
Example: Overflows from toilet bowls
Category 3: Category 3 water is grossly contaminated and can contain pathogenic, toxigenic, or other harmful agents. Its commonly called black water.
Example: Flooding from seawater