Category 1, 2, 3: What the Water's Source Means for Your House

The first question a restoration pro asks isn't "how much water?" — it's "where did it come from?" The industry standard (IICRC S500) sorts water into three categories, and the category determines what gets dried, what gets removed, and what the job costs.

Category 1 — clean water

From a sanitary source: supply lines, water heaters, an overflowing tub that was filling with clean water. The good news category: if drying starts fast, carpet, drywall, and most materials can usually be saved in place. This is why speed matters most on clean-water losses — you're racing to keep a Category 1 loss being a Category 1 loss.

Category 2 — gray water

Significantly contaminated: washing machine and dishwasher discharge, tub overflow with soiled water, toilet overflow with urine only. Contact and cleanup need protective equipment; carpet pad typically goes; cleaning and antimicrobial treatment join the drying scope.

Category 3 — black water

Grossly contaminated: sewage, drain backups, and all outside floodwater — including monsoon runoff, no matter how clear it looks. Porous materials it touched (carpet, pad, upholstery, drywall below the waterline) are removed rather than dried, hard surfaces are cleaned and disinfected, and PPE is non-negotiable. This is the category where DIY cleanup genuinely endangers your household.

The escalation clock

What this means for your decisions

• Clean source + fast response: aggressive DIY water removal helps while pro drying is en route; most materials savable.
• Any contamination: protect people first, skip the shop vac, and let a crew with PPE and containment handle removal. See flood cleanup for the monsoon version.
• On every estimate: the category should be stated in the scope. If a bidder never mentions it, that's a signal about their process.