How to tell how high the water got in the cabin

People argue about “just a little water” while the seat foam is a brown sponge. Height matters. A wet floor mat is one story. Water over the seat tracks and into the dash is another. The computers live in the middle of that argument.

You don’t need a laser. You need daylight, a photo, and a willingness to pull a corner of carpet. Houston silt leaves a receipt. So does the smell.

Do this before a shop vac and a box of baking soda erase the line. The adjuster isn’t coming to smell your optimism.

Do this now

Photograph the exterior water line on the doors, wheels, and rocker from several angles.
Open a door and shoot the carpet, the seat base, and any line on the plastic door card.
Press the seat foam. If it weeps dirty water, the water was at least that high.
Check the seat-belt webbing and the trunk spare well. They hold a stain.
Do not start the car to “see if the dash lights prove it was low.”

The marks that hold up

Silt on the carpet pile. A tide line on the door plastic. Mud in the seat-track grease. A stain on the belt that does not match spilled coffee. Rust starting on exposed seat springs. Those are useful.

A damp floor mat in a car that sat through Houston humidity is weaker evidence. Pair it with the exterior line and the stall.

Under the carpet and in the trunk

Water hides under the spare, in the foam under the trunk floor, and in the cabin air filter. If you can pop those without tools, photograph what you see. If you cannot, leave it for the shop and photograph the access panel.

Houstonians often report a “dry” cabin and a spare well full of bayou. The spare well is part of the cabin story.

How high is high enough to total

There is no single magic inch that every carrier uses. Water that reached modules, airbags, or the wiring harness makes a total more likely. Water that only kissed a floor mat on an old truck is a different conversation. Your job is the height record, not the accounting.

If two cars sat in the same garage, shoot both water lines. A pickup cab can stay dry while a sedan next to it is done.

Do not clean away the proof

You can remove wet clothes and a car seat for the baby. You should not steam-clean the carpets before the inspection. You should not spray perfume and call it dry.

If the car must move, photograph first, then tow. A shop can extract water. They cannot invent a silt line you already shampooed.