Water damage categories and classes, explained
Water categories
The categories come from the IICRC S500 standard for water damage restoration, the industry reference most companies and insurers use.
- Category 1 (clean): a broken supply line, a faucet left running, an ice-maker line
- Category 2 (gray): dishwasher or washing machine discharge, toilet overflow with urine but no feces, aquarium water
- Category 3 (black): sewage, floodwater from outside, water that sat long enough to grow bacteria
Categories can change
Clean water doesn't stay clean. After a day or two in warm conditions, especially in a Texas summer, Category 1 water in carpet and walls can become Category 2 or 3. That's another reason fast extraction matters.
Damage classes
- Class 1: a small area, little absorbed water, low-porosity materials
- Class 2: a whole room, water wicked up walls less than two feet, carpet and pad wet
- Class 3: water from above; ceilings, walls, insulation and floors all wet
- Class 4: materials that hold water tightly, like hardwood, plaster, concrete and stone
Why it matters to you
Category decides what can be dried and what must be removed. Carpet wet with clean water can often be dried in place; carpet soaked by sewage cannot. Class decides how much equipment and time drying takes. If an estimate lists a category or class you don't understand, ask the crew to show you why.
Questions
Is a toilet overflow Category 2 or 3?
A toilet overflow with urine only is typically Category 2. If feces are present or it came from a sewer backup, it's Category 3.
Why does Category 3 cost more?
It requires protective gear, removal of porous materials and disinfection, and more disposal.
This guide is general information for Texas homeowners, not legal, insurance or safety advice for your situation. Check your policy and follow local codes.
