How to Estimate Water Mitigation in Xactimate: IICRC Categories, Classes and the 2026 Storm-Water Position
Water mitigation files look simple until they reach desk review. Then every air mover, every day of drying and every labor line has to defend itself. Whether you write mitigation estimates as a restoration estimator or review them as an independent adjuster, the questions are the same: what kind of water was it, how much was there, what was done about it, and does the file prove it?
This guide walks through the parts of a water mitigation estimate that matter most in Xactimate. It covers how category and class drive scope, what the IICRC's February 2026 position statement on storm water changes (and doesn't), the labor-efficiency setting most people never look at, and the documentation that keeps an estimate from bouncing back.
Start with the standard: category vs. class
Mitigation estimating in the US is built on ANSI/IICRC S500, the Standard for Professional Water Damage Restoration. The current edition is the 5th, published in 2021. Two of its terms do most of the work in an estimate, and they get mixed up constantly.
Category describes contamination
- Category 1: water from a sanitary source that doesn't pose a substantial exposure risk.
- Category 2: water with significant contamination that can contain potentially unsafe levels of microorganisms.
- Category 3: grossly contaminated water that may contain pathogens. Rising water from rivers or streams and seawater flooding are listed examples.
S500 gives detailed source examples for each category. Use your copy of the standard rather than a list from memory, because the category can change with time and conditions (more on that below).
Category drives the type of work. Under S500 section 10.6.7, Category 2 and 3 intrusions should be remediated before restorative drying, and restorers "shall use contamination controls and appropriate worker protection." That is where antimicrobial application, removal of affected porous materials, containment and PPE enter the scope. With Category 1, the standard says restorers "can proceed without contamination controls."
Class describes the drying load
Class is about how much water the structure absorbed and how hard it will be to evaporate. It runs from Class 1 (the least water, with a small share of wet porous surfaces) up to Class 4 (deeply held or bound water in low-evaporation materials or assemblies). Class drives the amount of equipment and the drying time, so it shows up in your air mover and dehumidifier counts and the number of equipment days.
A widely cited Cleanfax summary puts rough wet-surface percentages on Classes 1 through 3 (under about 5%, about 5–40%, and over about 40% of the combined floor, wall and ceiling area). Those figures describe the 4th edition, so check your 5th-edition copy before you quote a number in a report. The same summary notes that class is determined after demolition or remediation is complete. In practice, the class call should rest on what you measured: the wet square footage of floors, walls and ceilings, and the materials involved.
A quick way to keep them straight: category tells you what you're allowed to dry in place, and class tells you how much drying you'll need.
The 2026 storm-water position: not automatically Category 3
Here's where 2026 changed the conversation. On February 10, 2026, the S500 Consensus Body approved a position statement on weather-related water. The S500 definition of Category 3 lists wind-driven rain from hurricanes, tropical storms and other weather events as an example of water that can be Category 3. The position statement clarifies what "can" means.
In short, the statement says:
- Top-down water intrusion, wind-driven rain and other weather-related water "are not automatically considered Category 3 Water."
- In the standard, "can" marks something that is possible, not part of the accepted standard of care.
- The Category 3 example "does not apply when water is not 'grossly contaminated,'" regardless of how it entered.
- The restorer makes the category determination through inspection and information gathering, and an indoor environmental professional should be brought in where the situation calls for one.
What that means for adjusters reviewing invoices
If you review mitigation after a wind or hail event, you've probably seen roof-leak losses billed as Category 3 by default, with the full contamination scope that follows. The position statement gives you a standard-based reason to ask for the basis of that call. The question isn't "why is this Cat 3?" in an accusatory tone. It's "what did your inspection find that made this grossly contaminated?"
The statement cuts both ways, though. S500 section 12.2.6 notes that "time and temperature can affect or retard the amplification of contaminants, thereby affecting its category." Rainwater that sat in a wall cavity for a week in August is not the same water it was on the day of the storm, and rising water from rivers or streams and seawater flooding are still listed Category 3 examples. A restorer who documents why the water was grossly contaminated is following the standard, not padding the bill.
The takeaway for both sides: the category call needs evidence in the file, not just a label on the first line of the estimate.
Building the estimate in Xactimate
Xactimate handles mitigation in its water (WTR) category, and Verisk lists XactScope water mitigation scoping among the platform's features. Whether you scope with XactScope, macros or line by line, a defensible mitigation estimate usually covers these areas.
| Scope area | What to capture | What reviewers look for |
|---|---|---|
| Emergency response | Service call, after-hours timing if applicable, water extraction by area | Extraction quantities that match the affected square footage in the sketch |
| Removal and tear-out | Wet carpet pad, baseboard, flood cuts, insulation, other affected porous materials | Photos and moisture readings showing why each item couldn't be dried in place |
| Contamination controls | Antimicrobial application, containment, PPE (Category 2 and 3) | A documented category determination that justifies the controls |
| Drying equipment | Air movers, dehumidifiers and any specialty equipment, priced per day | Equipment counts that fit the class and room sizes; days that match the drying log |
| Monitoring | Daily moisture readings and equipment adjustments | A drying log with dated readings that trend toward the drying goal |
| Contents | Moving and blocking furniture, pack-out if needed | The carrier's preferred line items for contents handling |
Carrier guidelines matter here more than almost anywhere else in property estimating. Carriers can differ on how the same task should be entered, and many have specific rules on equipment counts, monitoring charges and drying days. Learn them per carrier, and keep track of rejections so you don't repeat the same miss on the next file.
The labor-efficiency setting most estimators skip
Xactimate's labor efficiency options change how much labor time it builds into each line item. In a 2026 web seminar, Verisk laid out the current options: Restoration/Remodel/Service (the typical choice for restoration work), the newer Large Restoration/Remodel, and Total Rebuild or similar, with labor minimums applying across all of them.
The difference is not small. For WTR-LAB (water extraction and structural drying labor), Verisk lists productivity reductions of 25.000% under Restoration/Remodel/Service, 21.354% under Large Restoration/Remodel and 11.458% under Total Rebuild or similar. Those reductions account for planning, drive time, breaks and the productivity lost when working in a restoration environment.
Most mitigation jobs belong under Restoration/Remodel/Service. Verisk frames the choice as more than a quantity decision. Its seminar asks whether the volume is large enough to create real efficiency, whether the site is easily accessible, whether materials can be delivered without scheduling or special handling, and whether crews have to work around occupants. If an estimate's labor looks off, check this setting before you start arguing about individual lines.
Labor minimums on small losses
Small mitigation jobs often trigger labor minimums, which Xactimate can apply per line item or as a default. On a one-room supply-line loss, a minimum charge can be the difference between an estimate that pays for the trip and one that doesn't. Reviewers should expect to see them on small losses and question them on large ones.
Documentation that survives desk review
Mitigation is time-sensitive work that someone else reviews days or weeks later, usually without seeing the property. The file has to tell the story on its own.
The 12-hour update
Restoration estimator Jon Isaacson, writing in R&R magazine, recommends sending the adjuster a mitigation update within about 12 hours. It should cover:
- Whether extraction was performed
- The source of loss, with the category and class
- Affected rooms and initial moisture readings
- The equipment set, which is also the time to request approval for specialty equipment
- Estimated drying time, with a documented reason if it will run past three days
- Any lead, asbestos or other conditions that could delay the work
For adjusters, asking for this update on every assignment sets expectations early. For restorers, it gets approvals in writing before the invoice arrives.
F9 notes and photos
Labor (LAB) items get questioned more than anything else. Pair each one with an F9 note that explains what the labor covered and why no existing line item did, plus photo support and an "approved by adjuster" note if you discussed it beforehand. Don't add labor for work already included in another line item's description; duplicate scope is one of the fastest ways to lose a reviewer's trust.
For photos, shoot the front of the risk, the source of loss, every corner of the affected rooms, the affected materials and the equipment in place. Label each photo by room and subject, and drag them into the matching rooms in the sketch so the reviewer can follow them in order.
A pre-submission checklist
Before a mitigation estimate leaves your hands, or before you approve one, run through this list:
- Category determination is stated and supported by inspection findings, not assumed from the peril.
- Class is consistent with the affected square footage and materials in the sketch.
- Contamination controls appear only where the category supports them.
- Equipment counts and days match the drying log.
- Moisture readings are dated and show progress toward the drying goal.
- The labor efficiency setting fits the job.
- Every LAB line has an F9 note, and none duplicates an existing line item.
- Photos are labeled and placed in the sketch rooms.
- Carrier-specific guidelines have been checked.
Speeding up the build without cutting corners
Most water losses repeat the same core scope with different quantities. That's why many estimators keep a saved line-item list instead of rebuilding from scratch each time. A template works best as a starting point that you trim to fit the loss, not as a one-click estimate. (If you're fuzzy on the difference between a macro and a template, our post on understanding Xactimate macros and templates covers it.)
Storm Life's Complete Water Mitigation Estimating Template is an Xactimate ESX file with 300 line items for mitigation estimates, built so you can create your own custom macros from it. If your mitigation files also involve fire or smoke work, the Smoke and PPE macros cover smoke remediation, general conditions and standard PPE. And for the desk, the Water Mitigation Desk Mat puts interior component illustrations in front of you while you scope.
Whichever tools you use, the rule is the same: delete what doesn't apply, check every quantity against the sketch and make sure the file explains the category call. That's what turns a mitigation estimate into one that gets paid without a second round.