Restoration professionals use water categories to describe contamination conditions. The category helps inform the cleanup approach, but it is not a rating a homeowner should assign by looking at the water's color.
A proper assessment considers where the water originated and what it contacted as it moved through the property.
The three categories in plain language
Category 1 refers to water from a sanitary source. Category 2 involves significant contamination. Category 3 involves gross contamination. These distinctions concern contamination, not simply the depth of water or the amount of visible damage.
A broken supply line and a sewage backup require different considerations. Even water from a sanitary source may contact contaminants inside the building, so the initial source alone does not settle the assessment.
Weather does not determine the category by itself
The IICRC's February 10, 2026 position statement explains that wind-driven rain and other weather-related water are not automatically Category 3. Inspection and information about contamination are needed. There is also no universal rule that a particular color or a fixed number of hours determines every loss.
What the category changes for your project
Ask the mitigation provider to explain its assessment and the reasons behind material-removal or cleaning recommendations. A homeowner should understand what areas are included, which belongings require evaluation, and whether additional specialists are needed.
Equipment setup and access arrangements should follow the conditions found on site. A generic instruction to turn on fans or spray a product is not a substitute for that assessment.
Matrix explains the mitigation scope and documents its work. Keep those records along with any plumbing, environmental, or reconstruction documentation that relates to the same loss.
Contact Matrix Mitigation Services
For 24/7 emergency mitigation assistance, call 855-541-1010. Tell us the property location and current conditions so we can discuss the next steps.
Learn about our water damage mitigation services or contact Matrix.
Further reading: IICRC: Water Category and Weather-Related Events, February 10, 2026.