How fast does standing water need to come out?
Sooner than most people expect. Water left on a floor works into the subfloor, the baseboard and the bottom plate of the wall, and the damage grows while the room waits. Extraction is the fastest way to stop that growth.
Materials respond differently. Hardwood cups and cabinets swell after a short soak, while a concrete slab holds moisture for much longer and dries slowly from the inside out. Carpet and pad hold water like a sponge and trap it against the floor, so they are usually the first thing the crew removes, and the speed of that removal decides how much of the floor below is saved.
The crew does not wait for a dry room before taking the water out. They pump, vacuum and lift the bulk first, then measure what is left in the materials, because the surface water is only the visible part. Readings on the wood, the drywall and the subfloor tell the technician where the water has gone, and those readings set the order of the next steps.
Should I try to pump the water out myself?
A household wet vacuum can handle a small spill on a hard floor. A larger volume needs pumps and extraction equipment that a homeowner does not usually have, and running ordinary electrical equipment in standing water is a shock risk. Call first, then do only the steps that are safe.
The hazard is electrical as much as it is wet. An extension cord run across a wet floor, a plug left in a damp outlet or a vacuum that is not rated for wet use can all deliver a shock. A flooded basement or crawl space is worse, because the lights and the panel may be in the water and the stairs may be slick.
Pumps and vacuums that are borrowed or bought in a rush also tend to fail partway through, which leaves the room half wet and the owner with a bill for a second visit. A technician arrives with equipment set up for the volume and the access, and with meters to tell the crew when the water is actually gone.
What gets removed in the first visit and what stays?
Items that hold water and cannot be cleaned back to use are removed. Solid wood, tile, metal and cured finishes are usually kept and dried in place. The line between the two is set by what the water touched, how long it sat and what the materials are made of.
Carpet pad is the usual first removal, because it is almost always wet through and it holds moisture against the floor. Rugs, particleboard shelving, mattresses and cardboard storage are removed where they have soaked, since they cannot be dried back to a usable state with the equipment on a normal job.
Decisions about plaster, drywall and insulation are made later, after the first readings. Drywall that is wet to a set height is often cut and removed so the cavity can be opened and dried, while plaster that is merely damp may be dried in place. The technician explains each choice in the visit and notes it in the file.
What should I photograph and write down before the crew arrives?
Photograph the water, the affected rooms and any damaged item, before you move or clean anything. Write down when you found the water, where it came from and what was done to stop it. These notes save time with the crew and with an insurer.
Take wide shots of each room from the doorway and close shots of the water line on the walls and the cabinets. Photograph the source if you can see it safely, such as the split fitting, the water heater valve or the drain that backed up. Keep the damaged items where they are until they have been photographed and listed.
Write a short timeline in plain words: the time you noticed the water, the time you closed the source, who you called and when. Keep the receipts for any pump or cleanup you paid for. The crew will add its own readings and photographs, and the owner keeps the full set together.