1. Did the water come from inside or outside?
This is the first question because it decides which policy applies. Standard commercial property and HOA master policies treat water from a pipe, appliance, sprinkler, roof or HVAC system inside the building as a covered peril when the loss is sudden and accidental. Water that rose from outside, whether from a creek, a river, a canal, a storm drain that surcharged or rain that ponded on the ground and came through the door, is flood, and flood is excluded from almost every standard property policy unless a separate flood policy is in place. The California Department of Insurance consumer pages set out the distinction in the same terms.
The line is not always obvious on the day. Rain through an opened roof is usually a covered storm loss; the same rain rising from the parking lot and entering under the door is flood. A sewer backup is covered only if the policy carries a backup endorsement, and many do not. The moisture map and the photographs of where water entered are what settle the question, which is why they are taken before anything is moved.
Inside and sudden is normally covered. Rising from outside is flood and normally excluded. Long-term and neglected is normally excluded whichever side it came from.
2. Category 1, 2 or 3?
The industry standard for water damage restoration, IICRC S500, classifies water by contamination. Category 1 is clean supply water: a burst line, a failed fitting, a sprinkler head. Category 2 has significant contamination: water that has passed through a roof, a slab or contaminated flooring, or a dishwasher or washing machine discharge. Category 3 is grossly contaminated: sewage, canal or floodwater, or Category 1 or 2 water that has sat long enough to degrade.
The category sets the scope. Category 1 carpet can be dried in place; Category 3 carpet, pad and porous drywall are removed and manifested. Category 2 and 3 work is contained and run under negative air. Adjusters check that the category recorded on arrival matches the work billed, so a file that sets it early with photographs and, where relevant, sampling, closes faster.
3. How long was it wet?
Carriers cover sudden losses and exclude gradual ones: a slow leak behind a wall that stained the baseboard over months is repeated seepage, and most policies exclude it even though the pipe is inside the building. The EPA puts mold growth at 24 to 48 hours from wetting, so evidence of established growth at arrival is read as evidence of duration. Documentation cannot make a gradual loss sudden, but it can show the moment a sudden loss was discovered and how quickly mitigation began, which is what the duty-to-mitigate clause in most policies asks of the insured.
4. What the adjuster asks for first
On the day
Photographs of the source and the entry path, the S500 category and class, the extent mapped with moisture readings and thermal imaging, and the arrival time. These four items answer the inside-or-outside, category and duration questions before anyone argues about them.
During drying
Daily moisture readings against unaffected reference materials in the same building, equipment counts and placement, and manifests for everything removed. Equipment days are the most common supplement dispute, and the daily log is the only thing that settles it.
At close
Final readings at the dry standard, completion photographs, and scope in the estimating format the carrier uses, with line items tied to the photographs and readings that justify them.
Where the file is complete, adjusters routinely approve mitigation scope without a site visit. Where it is not, the visit happens after the drying equipment has gone and the argument is about memory.
5. Modesto and Turlock: where the flood question comes up
Two neighbouring cities show the two sides of the exclusion. Modesto's flood risk is riverine: Dry Creek runs through the city with no dam to moderate it and its most flood-prone reach is La Loma, and the Tuolumne reached a record 71 feet at the Ninth Street Bridge in January 1997, flooding downtown blocks. Water from either channel entering a ground floor is flood. Turlock is table-flat and floods from intensity rather than rivers: two thirds of an inch in one hour has put water over curbs on Lander and North Olive Avenues and into buildings, and back-to-back storms that arrive before Donnelly Lake and Dianne Pond drain to TID Lateral 4 leave east-side streets holding water. That is flood too, even with no river in sight. Any address in either city can be checked on the FEMA Flood Map Service Center, and an address outside a mapped zone can still flood and still be excluded.
The covered losses in both cities are the inside ones: galvanized supply failures in Modesto's pre-1970s housing and Turlock's railroad-era stock, ponding roofs on McHenry Avenue and Monte Vista Crossings after the first November storm, and grease-line backups in restaurant suites on Geer Road. See water damage restoration in Modesto and water damage restoration in Turlock for the local detail.
Questions
If water is still flowing, stop it and start mitigation; most policies require you to prevent further damage and cover reasonable emergency mitigation. Notify the carrier the same day. The file opened on arrival is what the adjuster reviews.
It depends on the master policy type and the CC&Rs. Bare-walls policies stop at the unit boundary; all-in policies include fixtures. The moisture map showing where water travelled is what the association and the unit owner's carriers use to allocate the loss.
Only with a backup or sump endorsement, which is optional on most commercial and HOA policies. Check the declarations page. Category 3 cleanup is scoped the same way either way; the endorsement decides who pays.
The daily drying log is the answer. Readings against reference materials show when the goal was reached and the equipment was pulled. Without a daily log the dispute is unwinnable.
