Water mitigation invoices: the fans are in the photo, the drying is in the log

A supply line lets go under a kitchen sink, the mitigation company comes out the same night, and a week later the invoice arrives: five air movers and two dehumidifiers, five days each, with photos of the equipment running in a wet room. The photos may be perfectly real. They show the equipment was there on the day each picture was taken. They don’t show that the floor was still wet on day four, and on a drying job the equipment days are a large part of the bill. The record that shows that is the drying log. This piece covers what a drying log records, what the photos can and can’t add, and how to check the invoice against both. It is not legal advice.

What the drying log is

The water restoration industry’s main standard is ANSI/IICRC S500. We haven’t read it; it isn’t published free. Two industry sources we did read quote or describe it:

• Readings every day. An IICRC-approved instructor, described by his publisher as having served on the committee for the 2021 edition, quotes it as saying “Restorers should record and monitor relevant moisture measurements DAILY, preferably at the same time of the day, until drying goals are achieved.”
• Adjusting when it isn’t working. The same instructor quotes it as saying that if monitoring “does not confirm satisfactory drying”, restorers should adjust the drying plan, including equipment placement, type or quantity.
• A dry standard, written down first. An article in Restoration & Remediation magazine, written by a restoration company, describes taking a reading of the same material in a part of the building that never got wet and recording it as the “dry standard”, the term it says the S500 uses. “That number is the finish line, and it belongs in the file on day one.”
• What a daily log holds. The same article says: “Every day on site, record temperature, relative humidity, and grains per pound at the affected area, at the dehumidifier (dehu) outlet, in an unaffected area, and outside.” The moisture content of the wet materials is logged the same day, tied to a sketch so each reading has a place.

Read together, those numbers should move. The wet materials trend down toward the dry standard, and when they reach it the job is done. That is what makes the log the check on the equipment days.

What the photos can show

• The source and the damage. Where the water came from, and which rooms it reached.
• How much equipment was there that day. A wide shot of each room with the equipment in place can be counted against the invoice.
• A reading, in a place. A photo of the meter against a wall with the number legible, next to a shot wide enough to show which wall. The magazine article calls this “the photo every adjuster wants and almost nobody takes”.
• Sometimes when. If the file still carries the camera’s own clock, the first and last photos should fall on the first and last days billed.

What they can’t

• That a room was still wet. A fan running in a photo looks the same on day one and on a day the floor was already dry.
• Every day billed. Photos are taken on some days. Unless there is one for each day, the days in between are only on the invoice.
• That the number on a meter is from this material. The article notes a pin reading and a non-invasive scan are not the same measurement, and the photo may not say which mode was used.
• That a wet-carpet photo means anything on its own. The magazine article’s own words: “A folder full of wet carpet is not evidence, it is wallpaper.”

Checks before you pay

1. Ask for the drying log and the moisture map. If the company followed the practice described above, it already has both. A mitigation invoice without them is a bill for equipment days with nothing showing they were needed.
2. Find the dry standard. There should be a reference reading from an unaffected area, taken at the start. Without it, “dry” has no number.
3. Match the last reading to the last day billed. The magazine article puts it bluntly from the contractor’s side: “If the log stops three days before the equipment came out, you billed three days you cannot defend.” The same goes for a log showing the dry standard reached on day three and equipment billed through day five. There may be a reason, such as no access to the unit, but ask.
4. Look for numbers that move. Readings that don’t change from day to day mean either the drying wasn’t working, which should have changed the plan, or the log wasn’t really taken daily.
5. Look for equipment that moves. The instructor quoted above writes: “Have you ever noticed how all the equipment goes in on the first day and magically everything dries at the same rate so all the equipment is removed at the same time on the last day of drying?” His point is that materials dry at different rates and equipment should be moved or pulled as they do. Every unit billed for the same days isn’t proof of anything, but it is worth a question.
6. Count the equipment in the placement photos and compare it with the invoice, room by room.
7. Ask for the meter photos and the final verification readings, on the same materials, at or below the dry standard.
8. Ask for the original photo files, not pictures pasted into an invoice PDF, which have usually lost their camera record. Why, and how to ask for the originals.
9. Drop this job’s photos in with the company’s earlier ones. The checker marks any two files in the same batch that are the same file, even under different names. An “equipment in place” photo reused from another unit or another day shows up that way, if it is the same file. A new photo taken on the wrong day won’t, which is why the log matters more than the picture.

If an insurer is paying, or a tenant is

When the loss goes to the owner’s insurer, the same file gets read again by someone who was never there. The magazine article says carriers “reinspect, desk-review, and audit”, and that “Equipment line items are the first thing a desk review cuts”. A manager who asks for the log before paying is asking the question the reviewer will ask later.

If you plan to charge some of the cost to a tenant, the log does a second job: it shows which rooms were wet and for how long, which a room-by-room charge needs. Who caused the leak is a separate question the log won’t answer; see frozen pipe photos and who let it freeze. In Colorado, a tenant’s report of mold has its own deadlines, covered in mold photos from a tenant.

Whether someone used AI on the photos

A picture of fans in a wet room is easy to generate now, and some generators write a mark into the file saying so. The checker reads those marks in photos, and the notes some phone editors leave when generative AI was used to alter a photo. A file with no such mark is not proven real. Most fakes and most genuine photos look the same to a file reader once they have been through a chat app or a screenshot. And on a drying job, even a perfectly genuine photo doesn’t say the room was still wet.

The limits, stated plainly

• We have not read the S500 standard. The two lines quoted from it come from an Accuserve blog post by instructor Ed Jones (posted 23 November 2025), and the “dry standard” term and the daily log contents come from an article by Apex Restoration in Restoration & Remediation magazine (23 July 2026). Both are written from the contractor’s side. Both read in November 2026.
• We don’t know whether any law, lease or insurance policy requires a mitigation company to hand you the log. Treat it as something you ask for, not something you are owed.
• Equipment billed past the last reading, or readings that don’t move, are questions, not findings. Access problems, hidden wet materials and slow-drying materials can all explain them. Our five-day example is made up, and we don’t know how often mitigation invoices are inflated.
• A photo with no camera record is not a fake. Text messages, chat apps and many portals remove the record from genuine photos every day.
• Our checker gives no confidence score and does not judge a picture by looking at it. It reads what is in the file, in your browser, and uploads nothing. A file with no AI marker is not proven real.
• This is not legal advice.

Related: what a contractor’s “after” picture actually proves, and flooring invoices: a photo can’t show how much.

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