Last updated: July 7, 2026 ยท Prices reviewed quarterly
Restoration pros classify every job as Category 1, 2 or 3 — and that single call triples your cost from one end to the other: roughly $3.75-$7 per square foot for Category 1 versus $12-$25+ for Category 3. Here is what the categories mean, who decides, and how to challenge a bad call.
The three categories, in plain English
| Category | What it is | Cost per sq ft | What must happen |
|---|---|---|---|
| 1 — Clean | Supply lines, rain through a window, tub overflow (clean) | $3.75 – $7.00 | Extract and dry in place; minimal removal |
| 2 — Gray | Washer/dishwasher discharge, aquarium, toilet overflow (urine only) | $7.00 – $12.00 | Dry + remove what absorbed it (carpet pad, some drywall) |
| 3 — Black | Sewage, outside floodwater, anything 48h+ standing | $12.00 – $25.00+ | Full demo of porous materials, PPE, disposal, sanitize |
The 48-hour escalator
Categories are not fixed: clean water becomes Category 2 after sitting roughly 48 hours, and gray becomes black. Bacteria multiply in warm, stagnant water regardless of where it came from. This is the single best financial argument for same-day extraction — you are literally freezing the price tier. Timelines: how long restoration takes.
Who decides the category — and how to challenge it
The restoration contractor classifies per the IICRC S500 standard, and your insurer’s adjuster can agree or dispute. If a contractor calls your dishwasher leak “Category 3” without explaining why, ask what contamination raised it and request it justified in writing. Inflated categories inflate per-square-foot rates and demo scope; deflated ones (an insurer trick) underpay the claim: know your coverage.
Category vs. Class (both appear on your estimate)
Category = how contaminated. Class (1-4) = how much evaporation is needed — Class 1 is a corner of a room; Class 4 is saturated hardwood, plaster and concrete that dries slowest. Cost scales with both: a Category 1 / Class 4 hardwood floor can out-cost a Category 2 / Class 2 bedroom.
Official resources & free help
- The standard your contractor should follow: IICRC S500 (ask for their certification)
- Sewage & floodwater health precautions: CDC cleanup guidance
- Flood events & recovery: Ready.gov/floods
FAQ
My toilet overflowed clean water. Category 1?
Tank water, yes. Bowl water with urine: Category 2. With feces: Category 3 — the fixture matters less than what was in it.
Rainwater through the roof — which category?
Usually Category 1-2 depending on what it crossed (roofing debris, attic insulation). Once it pools 48 hours, treat it as escalated.
Can I clean Category 3 myself to save money?
The EPA and CDC say no for anything beyond trivial spots: sewage carries pathogens that aerosolize during cleanup. This is the one tier where pros are non-negotiable.
Prices on this page are researched estimates compiled from the cited sources; your local costs will vary with market, access and scope. Always get multiple written quotes from licensed professionals before hiring.