Wind-Driven Rain Is Not Automatically Category 3

Full category/class tables and the 2026 position-statement if/then live on Water Damage Categories and Classes. This post is the headline; that guide is the field file.

Wind-driven rain is not automatically Category 3. The IICRC S500 Consensus Body put that in writing on February 10, 2026, and IICRC posted the position statement in April. If your estimator still writes “storm = Cat 3” before anyone walks the job, they are ahead of the standard, not behind it.

What the Consensus Body actually said

The 2021 S500 definition of Category 3 lists examples that can include contaminated water entering from wind-driven rain in a hurricane or other weather event. The word that matters is can.

In S500, can means a possibility open to the restorer. It is not the accepted standard of care. The example is grossly contaminated water, not the weather that delivered it. Clean rain that came in through a failed flashing is not sewage because a storm named it.

Read the statement yourself: Category of Water Damage and Weather-Related Events (PDF). Citations are to the 5th edition (2021). A new Consensus Body has started the next S500 revision. This position is about the book you already own.

Inspect, then determine

S500 still wants a preliminary determination — the restorer’s call on category so you can set a scope. That call comes after information gathering: source, time, contaminants, building history, materials, occupants. Assumptions on the drive over can change at the door.

If the water is Category 1, you can proceed without contamination controls. Category 2 or 3 needs controls and PPE before you dry. Time and temperature can move a category. So can what the water touched after it entered.

An indoor environmental professional is not automatic on every weather job. The statement walks the elevated-risk cases: high-risk occupants, public or care facilities, suspected contaminants, aerosolized material. Use an IEP when the inspection says you need one. Do not rent one because the radar looked ugly.

What to do on the next storm

Do not pre-print Cat 3 on the work order from the weather radio.
Walk the job. Photograph the source, the path, and anything that would make the water grossly contaminated.
Write the preliminary determination in the file, with the facts that got you there.
If an adjuster says “IICRC says all storm water is Cat 3,” send them the February 10 position statement. It says the opposite.

Shops that keep people treat this as a weekly habit, not a binder they open after a denial — the same point Jon Isaacson keeps making on DYOJO. The walk-through is the job.

Source: ANSI/IICRC S500 Consensus Body, Position Statement: Category of Water Damage and Weather-Related Events (dated February 10, 2026; posted on iicrc.org/s500). This article paraphrases the position. It is not IICRC-endorsed and does not replace the standard.