Determining Category of Water

4/8/2024 (Permalink)

Category 3 water coming up through sewer line.

The Categories of Water, as defined by the IICRC S500, refer to the range of contamination in water, considering both its originating source and its quality after it contacts materials present on the job site. Time and temperature can also affect the quality of water, thereby changing its Category. 

Category 1 comes from a sanitary water source. Examples are a tub or sink overflowing, rain water leaking in a doorway, melting ice or snow.  Once this water contacts other surfaces or materials, it may no longer be a category 1 loss.

Category 2 contains a significant about of contamination.  Examples are water discharged from dishwashers or washing machines, overflow from toilet bowls or even water from an aquarium. 

Category 3 is grossly contaminated water and carries harmful agents. Examples are all types of sewage backup,  rain water from hurricanes and tropical storms and water that comes from rivers or streams.

It is important to know the category of water you have when you get the lose mitigated so it is properly done and safe.