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What To Do in the First 24 Hours After Water Damage
July 23, 2026

What To Do in the First 24 Hours After Water Damage

If water is actively spreading through your home right now, stop reading and do three things first: shut off the water supply, cut power to any flooded rooms at the breaker box, and get everyone out of standing water. Once those immediate threats are handled, come back here — because what you do in the next 24 hours will determine how much of your home you save and how much you spend to save it.

Stop the Water First

Every minute water runs unchecked, it moves. It travels under baseboards, wicks up drywall, seeps beneath hardwood, and soaks into subfloor. A burst pipe can release hundreds of gallons per hour. So before anything else:

  1. Locate your main shutoff valve. In most Sioux Falls homes, it’s in the basement near the front foundation wall or in a utility closet. Turn it clockwise until it stops.
  2. If you can’t find the main shutoff, call your utility provider or a plumber — don’t wait.
  3. Turn off electricity to affected rooms at the breaker panel. Water and live circuits are a fatal combination. If the panel itself is in a flooded area, call an electrician before touching it.
  4. Stop the source if it’s appliance-related. A washing machine hose failure, dishwasher leak, or water heater rupture often has its own shutoff valve directly on the supply line.

Once the water stops flowing, take a breath. The emergency phase is over. Now the clock starts on a different kind of damage.

Document Everything Before You Touch It

This step feels counterintuitive when your instinct is to grab towels and start mopping — but documentation is what protects your insurance claim. Before you move furniture or pull up rugs:

  • Walk every affected room with your phone camera. Shoot wide angles of each room, then close-ups of waterlines on walls, saturated flooring, and damaged belongings.
  • Photograph appliances, serial numbers, and any structural damage you can see.
  • Write down the time you discovered the damage and what you believe caused it. Insurance adjusters will ask.
  • Don’t throw anything away yet. Even ruined carpet or a warped cabinet door may need to be inspected before disposal.

A two-minute video walkthrough narrated with what you’re seeing — “this is the kitchen floor, water came from under the dishwasher, you can see it’s reached the base of the cabinets” — can be more useful to an adjuster than a hundred still photos.

What You Can Safely Do in the First Few Hours

Once the water is off, power is safe, and you’ve documented the scene, there are meaningful steps you can take before a restoration crew arrives:

  1. Remove standing water with a wet/dry shop vac if you have one. Every gallon you extract is one that won’t soak deeper into the subfloor.
  2. Pull up area rugs and move them outside or to a dry garage. Rugs left on hardwood or laminate will trap moisture and accelerate warping.
  3. Prop up sofa legs and furniture on aluminum foil, plastic bags, or wood blocks to prevent rust stains and dye transfer onto wet flooring.
  4. Open windows if outdoor humidity is lower than indoor humidity. In South Dakota summers, outdoor air can be humid enough that opening windows actually makes things worse — use your judgment or check a weather app for the dew point.
  5. Run fans and your HVAC system to start moving air. Avoid pointing fans directly at walls with suspected hidden moisture — you can push surface air dry while damp cavities stay wet behind the drywall.
  6. Move valuables, documents, and electronics to dry areas of the house.

What you’re doing here is slowing the damage — not reversing it. Professional drying equipment (industrial air movers, desiccant dehumidifiers, moisture meters) works at a different scale than a box fan.

What NOT to Do

Some common instincts make the situation worse:

  • Don’t use a regular household vacuum to suck up water. It isn’t designed for liquids and can be a shock hazard.
  • Don’t walk through standing water if you haven’t confirmed the power is off. This includes water in a basement where the panel is on the wall.
  • Don’t turn on ceiling fans or overhead lights in rooms with wet ceilings — saturated drywall above a fixture can fail.
  • Don’t use a hair dryer or space heater to dry walls. Rapid surface drying traps moisture inside wall cavities, which is exactly the condition that allows mold to colonize within 24–48 hours.
  • Don’t wait to call your insurance company. Most policies require “prompt notice” of a loss. Waiting several days to report can complicate your claim.
  • Don’t assume the damage is only where you can see it. Water follows gravity and capillary action. A leak on the second floor can travel inside wall cavities and appear as a stain on the first floor ceiling — or not appear at all until mold does.

When to Call a Professional Restoration Company

Some water damage is genuinely DIY-manageable: a small appliance leak caught immediately, a single room with hard flooring, a few hours of exposure. Most isn’t.

Call a professional restoration company if:

  • The water came from a sewage backup or toilet overflow. Category 3 “black water” contains pathogens. It requires protective equipment and specific disposal protocols — not a mop and bleach.
  • The affected area is larger than about 10 square feet, or you can’t determine how far the water traveled.
  • The water was in contact with drywall, insulation, or subfloor for more than a few hours. These materials absorb and hold moisture invisibly.
  • You can smell something musty within 24–48 hours. Mold can begin colonizing in as little as 24 hours under warm, wet conditions. That smell is not just unpleasant — it’s a sign the biology has already started.
  • Your home is older construction. Sioux Falls has a significant stock of homes built before 1980. Older homes may have lead paint or asbestos-containing materials that require certified handling before any demo work begins.
  • You’re filing an insurance claim. A professional restoration company can document moisture readings, photograph hidden damage with thermal imaging, and provide the scope of work your adjuster needs — in a format that holds up.

Professional water damage restoration involves industrial drying equipment placed strategically based on moisture mapping, not guesswork. The goal is to bring structural materials back to their pre-loss moisture content — typically measured with a pin or pinless moisture meter — before any reconstruction begins.

The Longer Recovery: What Comes After the First 24 Hours

If a restoration crew is involved, expect the drying process to take three to five days on average, sometimes longer for concrete slabs or multi-layer flooring assemblies. During that time, equipment runs continuously and technicians return daily to take readings and adjust airflow.

Once the structure is certified dry, reconstruction can begin — replacing drywall, flooring, cabinets, or whatever materials couldn’t be saved. That phase timeline depends on the scope of damage and material availability.

Throughout the process, keep a written log: who you spoke to, what was said, what was removed, what readings were taken. This record protects you if there’s a dispute with your insurer or a question about whether the job was completed correctly.


If you’re dealing with water damage in the Sioux Falls area right now and you’re not sure whether the situation is beyond what you can handle, it’s worth a phone call to get a straight answer. Crew Restoration & Construction can be reached at (605) 965-2727 — describe what you’re seeing and get an honest assessment of next steps.

Frequently Asked Questions

How long do I have before water damage becomes a mold problem?
Mold can begin to colonize wet porous materials — drywall, wood framing, carpet padding — in as little as 24 to 48 hours under warm conditions. The clock starts when the material gets wet, not when you notice the damage. This is why rapid extraction and drying matters more than waiting to see if things dry out on their own.
Will my homeowner's insurance cover water damage?
It depends on the cause. Most standard homeowner's policies cover sudden and accidental water damage — a burst pipe, a washing machine hose failure, an ice dam backup — but exclude gradual leaks, flooding from outside the home, and sewer backups (though riders for those are available). Review your declarations page, then call your insurer to open a claim as soon as possible, since most policies require prompt notice of a loss.
Is it safe to stay in my home while it's being dried out?
Often yes, if the damage is contained to one area and the air quality seems normal. However, if the water source was a sewage backup, if there's visible mold growth, or if large sections of flooring or ceiling are compromised, staying elsewhere during the drying phase is a reasonable precaution. Your restoration company can give you a clearer picture once they've assessed the scope.
What's the difference between a water mitigation company and a general contractor, and which do I need?
Water mitigation focuses on stopping damage and drying the structure — extraction, drying equipment, moisture monitoring, and removing unsalvageable materials. A general contractor handles the rebuild: new drywall, flooring, painting, cabinetry. Many restoration companies, including those that handle reconstruction, do both under one roof, which simplifies the insurance process. If you're early in a loss, start with mitigation — reconstruction can't begin until the structure is dry anyway.

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