Water Loss Class and Category

Plain-English categories 1, 2, 3 and classes 1 to 4.

Run the calculator

Formula and source

(reference page; no compute) IICRC S500-2021 water-loss classes (1 = least amount of water absorption through 4 = greatest, water trapped in materials with low evaporation rates) and categories (1 = sanitary / 2 = significantly contaminated / 3 = grossly contaminated). Original plain-English summary; standard text not reproduced.

IICRC S500-2021 §10.6 (Class) and §10.5 (Category) by section.

Audience

This tile is built for restoration and the adjacent professions in the Water Damage and Mold Restoration group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.

Related tools

Posture

Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.