An introduction to how the source and contamination affect cleanup.
Category 1: initially clean water
Water from a sanitary source may start as Category 1. Examples can include some supply-line breaks. The actual conditions still matter: water can contact dirty materials and become more contaminated over time.
Category 2: significant contamination
This water can contain material that may cause discomfort or illness. Some appliance discharge or other sources may fall here, depending on the circumstances. The affected materials and route of travel must be inspected.
Category 3: gross contamination
Sewage and outside floodwater are examples that call for particular caution. Keep people away, especially when exposure is possible. A trained restoration team should assess containment, removal, cleaning and drying needs.
Why an on-site assessment matters
A category describes contamination; it does not by itself tell you which walls, floors or belongings can be saved. The source, time, materials and observed conditions determine the work scope. Do not assume clear-looking water is safe.
Further reading: CDC floodwater safety guidance ↗