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The Misclassification of Storm Water Damage

Jason Yost • Nov 14, 2022

Is Storm Water Entering Through the Roof Contaminated?

Perhaps you're reading this because you or someone you know has been told by a restoration contractor that the water damage to your home or office is "a Category 3 water damage", requiring extensive demolition and expensive and time-consuming remediation. If you are, you aren't alone. Here, in Florida, we deal with storm related water damage events constantly. And, constantly, I witness contractors misclassify the water damage.


Classification of water damage isn't something contractors made up. It is something in the Institute of Inspection, Cleaning, and Restoration Certification's (IICRC) S500, Standard for Professional Water Damage Restoration. To summarize, this standard recognized that not all water is the same and some types of water pose a threat to those who contact it while others do not. So, what the standard did was categorize the water by the presence or absence of contamination and the level of contamination. Category 1 is clean water; Category 2 is water that has some contamination and can cause discomfort or sickness if contacted or consumed by humans; while, Category 3 water is grossly contaminated and can contain pathogenic, toxigenic, or other harmful agents.

Storm water damage to ceiling drywall

A key to understanding the Category of a water damage is this: (1) it relates to an environment where excessive water exists and needs safely processed (i.e., removed) (2) and it defines the cleanliness of the water only. It doesn't define the environmental or air quality relative to anything else (e.g., whether mold contamination is present or not). Yet, many contractors will classify water damage as Category 3 with no excessive water, or where the source or the indoor environment doesn't constitute the classification. I'll give you an example: 


This picture was taken in a home that had the roof damaged during Hurricane Sally. During the hurricane, wind lifted and broke some of the shingles, eventually leading to water infiltration. The infiltrating water entered the attic, was absorbed by the attic insulation, where the wet insulation sat on ceiling drywall. The water was absorbed by the drier drywall and damage occurred. Now, does this sound like a Category 1, 2, or 3 water damage to you? 

Well, their contractor told them that this was a Category 3 water damage. Why? Because, they claim, the S500 says wind-driven rain is an example of Category 3 water. Well, let's take a look at what the S500 says:

Examples of Category 3 water can include, but are not limited to: sewage; waste line backflows that originate from beyond the trap regardless of visible content or color; all other forms of contaminated water resulting from flooding from seawater; rising water from rivers or streams; and other contaminated water entering or affecting the indoor environment, such as wind driven rain from hurricanes, tropical storms, or other weather related events if they carry trace levels of contaminants (e.g., pesticides or toxic organic substances).

Key to this definition isn't that wind driven rain from hurricanes constitutes grossly contaminated water; rather, it is the last part of this sentence: "if they carry trace levels of contaminants" (e.g., pesticides or toxic organic substances). The IF has to be defined and exist before such sources of water constitute Category 3 water. So, while it may be possible for wind driven rain to enter a building and mix with something that causes it to become contaminated or be exposed to other environmental conditions (e.g., time and temperature) that cause it to deteriorate in cleanliness, the assumption that wind driven rain is Category 3 water is, well, just that: an assumption.

So, don't let someone tell you that just because storm water entered your home or office from the sky it is grossly contaminated. It's one thing to express a concern and have that concern assessed by an independent Indoor Environmental Professional (IEP); it's another to assume something that costs people their homes and offices without justification. In future blogs I'll discuss how professionals determine the Category of water damages. In the meantime, if you find yourself in a situation where a preliminary determination can’t determine the Category of water damage in your home or office, contact Gulf Coast Center for Indoor Air Quality Services and let’s discuss how we can serve you. 

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