- Source water, time since onset and affected materials predict S500 category before the truck rolls.
- Source water maps to category. Time since onset drives microbial growth and category escalation. Materials drive replacement scope.
- Capture all three at intake and the estimator opens a submission with 60–70% of the fields already populated.
The category of a water loss is usually clear in the first two questions of the intake call, before the dispatcher has the address. Three signals captured in the first ninety seconds predict how complex the claim is going to be. Operators who train their intake staff to recognize these signals route the right crew the first time, build cleaner estimates and close out claims faster.
The three signals are source water type, time since onset and affected materials. Each maps cleanly to a downstream operational decision. Together they predict the IICRC S500 category, the equipment package and the crew size with high reliability.
Signal one: source water type
The single most important question on a water loss intake call is "where is the water coming from." The answer maps to S500 category. A supply line, a dishwasher overflow or a clean appliance discharge is Cat 1. A toilet overflow without fecal content, a washing machine discharge or a long-stagnant supply leak is Cat 2. A sewage backup, ground water intrusion or any source with gross contamination is Cat 3. The intake person who asks this question with a follow-up on whether the source is clean has done the protocol work that the estimator will need on the back end.
The mistakes happen when the intake person accepts "there is water" without pushing on the source. A homeowner who does not know plumbing terms will describe the source vaguely. The intake person has to translate. "Is it coming from a pipe in the wall, an appliance, a fixture like a toilet or sink, the roof, or the ground" gets the homeowner to the answer faster than open-ended questioning.
Signal two: time since onset
The second signal is how long the water has been present. A loss discovered within an hour of onset is operationally different from one discovered after a weekend away. Time drives microbial growth, which drives category escalation. A Cat 1 supply line leak that has been present for 72 hours is now a Cat 2 by S500 protocol, because the water has dwelled long enough to contaminate.
The intake question is simple. "When did you first notice the water." The answer drives equipment recommendations. A fresh loss can be addressed with desiccants and air movers. An older loss might need antimicrobial treatment and more aggressive drying. The truck sent out should reflect the difference.
Signal three: affected materials
The third signal is what the water has touched. Hardwood. Engineered wood. Vinyl plank. Carpet. Drywall. Insulation. Each material responds to water differently and requires a different mitigation approach. Hardwood with Cat 2 water under it is usually a removal job. Vinyl plank with the same water might be a dry-in-place job if caught early enough.
The intake person who captures floor type, wall material and ceiling material at intake gives the estimator the inputs to build the estimate before the truck arrives. Most intake scripts skip this entirely. The data gets gathered for the first time on site by the tech, which means the truck rolled with a guess about what equipment to bring.
How these signals combine
The three signals together predict the claim complexity with high accuracy. Cat 1 + fresh + low-absorption materials = small job, small truck, fast cycle time. Cat 3 + 48-hour dwell + hardwood = large job, full crew, multi-day cycle, likely insurance complexity. The intake person who knows this mapping can give the dispatcher a confidence level on the dispatch decision in the same call.
This is operational alpha that does not require new software. It requires the intake person to know S500 well enough to triage. The companies that have invested in this training run faster, with fewer return trips and cleaner estimates.
The downstream win
The estimator's job gets easier when the intake captures these three signals cleanly. The Xactimate estimate built from a well-captured intake clears carrier review on first submission at materially higher rates than estimates built from partial intake data. The cycle time on the claim shortens. The cash conversion improves. The carrier scorecard reflects the difference.
Where AI matches the protocol
An AI voice agent built for restoration intake holds the three-signal pattern on every call. The system asks the source question, the time question and the materials question in sequence, and it pattern-matches the answers against the S500 protocol logic. The category determination lands in the dispatcher's hand with a confidence level attached, in the same call. Stoa's intake flow runs this triage by default on every water loss.
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