Why the first 24 hours decide how big the job gets
Water does not sit where it lands. It wicks up drywall, runs along the top plate of a wall, and travels under cabinets and subfloor where nothing about the room looks wrong. A puddle in a hallway routinely means wet material in three rooms.
The EPA's guidance is that wet materials dried within 24 to 48 hours will, in most cases, not grow mold. That single sentence is the whole reason restoration is an emergency trade rather than a scheduled one.
The EPA is careful to call 24 to 48 hours a guideline rather than a guarantee. Mold does not always appear after 48 hours, and it can sometimes take hold even when materials were dried inside the window. Faster is better; it is not a switch that flips at hour 49.
What to do, in order
- 1
Stop the water
Shut off the main. It is usually near the front hose bib, at the meter by the street, or in the garage. For a water heater, close the valve on the cold inlet at the top of the tank. If you cannot find it, call and someone will talk you to it.
- 2
Kill power to the affected area, if you can do it safely
Water and electricity together is the one part of this that can hurt you. If reaching the breaker means standing in water, do not. Call the utility or an electrician.
- 3
Photograph everything before you move anything
Wide shots of each affected room, then close-ups of damaged materials, then the source itself. Insurance claims turn on what the damage looked like before cleanup started, and once you have moved things you cannot get that back.
- 4
Get standing water out and air moving
A wet vacuum for standing water, then open windows and run fans if the weather allows. Household fans will not dry a structure, but they slow things down while you wait.
- 5
Lift what you can off wet flooring
Furniture legs stain carpet and the stain is usually permanent. Foil or wood blocks under the legs, and get rugs, boxes and anything paper off the floor entirely.
- 6
Call a restoration contractor, and call your insurer
In that order if water is still active. The contractor stops the loss getting worse. The insurer starts the claim. Ask the contractor for moisture readings and drying logs, because those are what the adjuster will want.
What should you photograph, exactly?
This is the step people skip and regret. Cleanup destroys evidence, and an adjuster who arrives three days later is looking at a dried-out room and taking your word for what it looked like.
- A wide shot of every affected room, from the doorway, before anything moves
- Close-ups of wet drywall, baseboard, flooring and cabinet bases
- The source itself: the failed supply line, the water heater, the ceiling stain
- Any standing water, with something in frame for scale
- Damaged contents individually, not in a pile
- The water meter, if you suspect a slab leak, showing it moving with everything off
- Timestamps on. Most phones do this automatically, and it matters here
What not to do
- Do not throw anything away before it has been photographed and documented, however ruined it looks
- Do not run your HVAC system if the water was contaminated, because it moves the contamination through the whole house
- Do not assume a floor that feels dry is dry, since a surface can read dry while the subfloor underneath is saturated
- Do not wait on the insurance company before stopping the water, as most policies require you to prevent further damage
- Do not walk into standing water if there is any chance it is touching electrical
When does this stop being a do-it-yourself job?
Household fans and a shop vac handle a small, clean spill caught immediately. They do not dry a structure. Drying is a measurement, and the equipment that does it is sized to the affected area and the class of water.
- The water was not clean, meaning it came from a drain, a toilet or outside
- It has been more than 24 hours
- It got into walls, under flooring, or into insulation
- More than one room is affected
- You are making an insurance claim, because the documentation is a large part of what you are paying for
Common questions
How long does water damage take to dry out?
Most residential jobs run three to five days of active drying, but it depends on how much water there was, which materials got wet, and how much of it is inside walls or under flooring. Equipment comes out when moisture readings say the structure is dry, not when a schedule says the job should be over.
Should I call insurance or a restoration company first?
If water is still active, the contractor, because stopping the loss getting worse is time-sensitive and most policies require you to do it. Call the insurer right after. If the water is already stopped, the order matters much less.
Can I just dry it myself with fans?
For a small clean spill caught immediately, yes. Household fans move air but do not remove moisture from the air the way a dehumidifier does, so on anything larger you end up evaporating water out of the floor and back into the drywall.
Will my carpet be ruined?
Not necessarily. Carpet from a clean water source, extracted quickly, can often be saved, though the pad underneath frequently cannot. Carpet soaked by contaminated water is generally not salvageable.
How fast does mold actually start growing?
The EPA's guidance is that drying wet materials within 24 to 48 hours will in most cases prevent mold growth. It is a guideline rather than a hard threshold, so the practical takeaway is to start drying as fast as you can rather than counting hours.
Sources
The factual claims on this page come from these. Check them yourself rather than taking a contractor's word for it.