Water Damage and Category type

1/4/2018 (Permalink)

IICRC Standard and Reference Guide for Professional Water Damage Restoration sets three categories of water that cause damage in buildings. They are summarized as follows:
Category 1 Water - Refers to a source of water that does not pose substantial threat to humans and classified as "Clean Water". Category 1 water may become contaminated if it mixes with soils or floor coverings, building assemblies, etc... Time and temperature can promote growth and amplification of microorganisms in water can cause Category 1 water to degrade.

Examples of category 1 water are: a broken water supply line (including the toilet), and tub or sink overflows. 

Category 2 Water - Refers to a source of water that contains a significant degree of chemical, biological or physical contaminants.  These contaminants can cause discomfort or sickness when exposed or consumed. This water type carries micro organisms and is nicknamed "Gray water."

Examples of catagory 2 water are:  toilet bowls with urine (no feces), sump pump failures, dishwasher water discharge, and washing machine water discharge.

Category 3 Water - Nicknamed "Black Water" and are grossly unsanitary. These indoor water sources  contain unsanitary agents, harmful bacteria and fungi, causing severe discomfort or sickness.

Examples of type 3 water are:  water sources from sewage, seawater, stream or river water, ground surface water or standing water.

Category 2 Water that is not promptly removed and remained stagnant may be re classified as Category 3 Water. Toilet back-ups that originate from beyond the toilet trap is considered black water contamination regardless of visible content or color.

Knowing the classification of your water may help you understand personal safety concerns and the necessary material and debris removal anticipated.