Can the provider tell me how many days it will take?

They can give you an estimate once they've measured what's wet, but treat it as an estimate. The job is done when the readings reach the dry goal for each material. Ask what could stretch it out, such as a wet slab, soaked cabinets or monsoon humidity.

The carpet feels dry. Is the floor under it dry too?

Not necessarily. Carpet dries on the surface first, while the pad and the subfloor can stay wet. The EPA says the subfloor under wet carpet has to be cleaned and dried too, so ask for a moisture reading underneath before anyone calls it done.

Does a concrete slab take longer to dry than drywall?

Usually, yes. Concrete holds moisture longer than drywall, and tile, laminate or carpet over it slows it down further. New flooring over a wet slab should wait until readings say the concrete is dry. After a slab leak, expect the concrete to need extra time.

Does monsoon season slow drying down?

It can. University of Arizona climate researchers note that during the monsoon, outside air is already moist. Open windows can bring moisture in on those days, and dehumidifiers have more work to do.

Can the baseboards and drywall go back once the wall looks dry?

Wait for the final readings. Closing a wall over wet framing traps the moisture where nobody can see it, and the EPA lists the back side of drywall among the places mold hides. If a musty smell shows up later, see our guide to signs of hidden mold.

How Long Does Water Damage Take to Dry?

The honest answer: it depends

You’ll find day counts online for how long a wet house takes to dry. We haven’t found an authoritative source that backs any single number, and the government guidance we rely on doesn’t give one. A small spill on a tile floor dries off quickly. A soaked wall cavity or a wet concrete slab can take much longer.

What the EPA does give is a deadline for getting started, plus guidance on which materials can be dried and which can’t. The rest comes down to measurement. The house is dry when moisture readings say so, not when a certain number of days has passed.

If water is still coming in, start with our first-hour guide instead.

The 24 to 48 hour window

The EPA advises drying water-damaged areas and items within 24 to 48 hours to prevent mold growth. Joint EPA and CDC guidance for homeowners is blunter: if you weren’t able to dry the home, including furniture and other items, in that window, assume you have mold growth.

The EPA also calls the 48 hours a guideline. In its cleanup table, it notes that mold may grow even when materials are dried by the 48-hour mark, and that mold won’t always grow after 48 hours.

Read the window as a deadline to get drying started and the wettest materials dealt with. It isn’t a promise that the whole house will be dry in two days. That’s why emergency water extraction and drying equipment usually start right away, and why materials that can’t be dried in time are often removed instead.

What drying time depends on

How much water, and how long it sat

A cup of water under the sink and an inch across three rooms are different jobs. The longer water sits before it’s extracted, the farther it wicks up drywall, soaks into cabinet bases and spreads under flooring. Every material it reaches is one more thing to dry.

What got wet

Materials dry at very different speeds:

Drywall wicks water up from the floor. The EPA says it may be dried in place if there’s no obvious swelling and the seams are intact, and to ventilate the wall cavity if possible. If it has swollen, it should be removed and replaced.
Carpet and pad. The EPA says to dry carpet within 24 to 48 hours, and that the subfloor under it must also be cleaned and dried. Soaked pad is usually replaced rather than dried.
Wood. Framing, baseboards and wood subfloors take up water and give it back slowly.
Concrete slab. Concrete holds moisture longer than drywall does. University of Arizona Cooperative Extension says floating and monolithic slabs are the most common foundations in Arizona, so many Valley floors are concrete under the tile, carpet or laminate. Flooring laid over the slab slows its drying.
Cabinets. Water runs under cabinet bases and behind the toe kick, where almost no air reaches. Particleboard that has swollen usually can’t be saved.
Insulation. The EPA’s table says wet insulation should be thrown out and replaced, not dried.

Whether the source is fixed

Drying can’t finish while water is still getting in. A supply line that still drips, a slab leak that hasn’t been repaired or a roof that leaks again in the next storm will keep the readings from coming down. Get the plumber or roofer working at the same time as the drying.

What kind of water it was

The restoration industry’s IICRC S500 standard sorts water into categories by how contaminated it is. For Category 2 or 3 water, the standard says remediation should happen before restorative drying, with contamination controls in place. The EPA’s cleanup table also says not to use fans before you’ve determined that the water is clean or sanitary.

So water from a toilet, drain or sewer line adds steps before drying can begin, and more porous material usually gets thrown out. The IICRC also notes that time and temperature can affect a water’s category. See sewage backup cleanup if that’s your situation.

Humidity inside and out

Drying moves water out of materials and into the air, then pulls it out of the air. The more moisture the air already holds, the slower that goes. The EPA recommends keeping indoor humidity between 30% and 60% to decrease mold growth.

Monsoon season makes this harder. The National Weather Service treats June 15 through September 30 as the monsoon. Before 2008, it marked the season’s start by humidity: three days in a row with an average dew point of 55°F or higher in Phoenix. University of Arizona climate researchers note that during the monsoon, “outside air is already moist.” On those days, open windows can let moisture in, and an evaporative cooler adds moisture to the air by design.

Whether the equipment keeps running

Air movers and dehumidifiers are meant to run day and night. Turning them off overnight, unplugging one to use the outlet or shutting the door on a room lets humidity build back up. If the noise or heat is a problem, ask the provider before you switch anything off.

The Valley’s dry air and the water you can’t see

Phoenix-area air is dry most of the year. A wet tile floor or countertop dries off fast, and it’s easy to assume the rest of the house will follow.

Usually it won’t, at least not in time. Water inside a wall cavity, under laminate, beneath cabinets or in the slab barely touches room air. The EPA lists the back side of drywall, the underside of carpet and pad, and the inside of walls around leaking pipes among the places mold hides. Those are the same places moisture hides after a leak.

Dry air helps with surfaces. The hidden water needs air movers, dehumidifiers, sometimes openings in the material, and readings to show it’s gone. Structural drying covers how that work is done.

Why fans alone, or a dry feel, can fool you

A box fan pointed at a wet wall dries the paint. It does little for the back of the drywall or the wood at the bottom of the wall. Without a dehumidifier, the moisture it lifts off the surface stays in the room and can settle into other materials.

Fans can also make things worse. The EPA says not to use them before you know the water is clean. Joint EPA and CDC guidance says not to use fans if mold has already started to grow, because they may spread it. If you already see mold, mold remediation comes before drying.

Touch is a poor test. Carpet can feel dry while the pad and subfloor are wet. Baseboard paint can feel dry over swollen wood. A wall can look fine while the drywall behind the paint still holds water. The surface dries first, and the surface is all your hand can check.

How a provider confirms it’s dry

Expect the provider to measure, record and compare:

Moisture meters. Pin meters read moisture inside wood and drywall at one spot. Pinless meters scan behind a surface without making holes.
Thermal cameras. Wet areas often show up cooler, which helps show where to take readings. A thermal image alone doesn’t prove something is wet.
Hygrometers. These measure humidity and temperature in the room, so the provider can tell whether the dehumidifiers are keeping up.
A dry goal for each material. Many providers read the same kind of material in a part of the house that never got wet and use that as the target. Drying continues until the wet areas reach it.
A daily drying log. Readings from the same spots each day, plus the equipment on site. Arizona’s Department of Insurance and Financial Institutions suggests homeowners keep their own log of times, dates, names of technicians and equipment used, such as dehumidifiers, air movers and moisture detectors.

Readings should trend down from one day to the next. If they stall, ask why. It can mean the leak isn’t fully fixed, water is trapped somewhere nobody has opened, or the air is too humid for the equipment on site.

When materials come out instead of drying

Some materials can’t be dried, or can’t be dried in time. Taking them out often shortens the job, because it opens the structure behind them to air. Based on the EPA’s cleanup table for clean water and common practice, these usually come out:

Drywall with obvious swelling or seams that have come apart.
Insulation and ceiling tiles.
Soaked carpet pad.
Swollen particleboard cabinet bases and swollen laminate flooring.

The EPA adds that upholstered furniture may be difficult to dry completely by the 48-hour mark. For floodwater, joint EPA and CDC guidance says to throw away anything wet with it that can’t be cleaned and dried completely within 24 to 48 hours. Photograph removed materials first, and ask your insurer how they want them documented.

Older homes need care before anything gets cut. The EPA says homes built before 1978 are more likely to have lead-based paint, and that cutting and demolition in those homes can create lead-contaminated dust. It also says testing is the only way to know whether a material contains asbestos. Leave the demolition to a contractor trained in lead-safe work practices.

Questions to ask the provider

What’s wet, and how do you know? Ask to see the readings and where they were taken.
What dry goal are you using for each material?
Can I get the daily readings and photos in writing? That record helps with an insurance claim, and with any musty smell that shows up months later.
What will you remove, and why can’t it be dried?
Should I run the air conditioning or the evaporative cooler while the equipment runs?
What happens if the readings stop improving?
Can I see the final readings before any drywall, baseboard or flooring goes back?

Before any work starts, look up the contractor’s license with the Arizona Registrar of Contractors and get the scope of work in writing. Our insurance guide covers what your insurer may want to see.

How long does water damage take to dry?