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Water damage cleanup: what to do first and what happens next
By the Strauss Restoration crew·Updated August 10, 2026
A flooded basement or a burst supply line puts you in the middle of a process you did not choose to learn. This is that process, laid out in order: what to do in the first few minutes, why the first day matters more than people expect, how a professional crew extracts and dries a house, and where the line sits between a mop-and-fan afternoon and a job that needs equipment you do not own.
Short answer
Shut off the water source and check for electrical hazards before anything else. Materials left wet past 24 to 48 hours risk mold growth, so extraction and drying start the same day. Clean water is often savable; sewage and floodwater are not, and both need professional handling rather than a mop.

Shut off the water and check for hazards
Two things come before cleanup, and both are about safety. Check the breaker panel first: if it's dry and you can reach it without walking through water, shut off power to the affected rooms. If reaching it means stepping into standing water, stay out and wait for someone who can shut it off safely.
Second, stop the source. For a burst pipe or a failed supply line, close the main shut-off valve, usually where the water line enters the house, near the water heater or the wall facing the street. A single fixture or appliance often has its own shut-off valve close by, which is faster than the main if that is clearly where the leak is. If the water is coming from a drain, a toilet, or rising in from outside, treat it as contaminated and keep kids and pets out of the room. If you cannot find the valve or the water will not stop, call our emergency line. We offer same-day emergency response, six days a week, and can walk you through the shutoff while a crew is on the way.
Why the first day matters: wicking and the mold-growth window
Water moves well past where it first lands. Drywall, baseboard, and framing pull moisture upward and sideways through capillary action, a process called wicking, so a puddle that looks contained to one corner of a room is often already a foot up the wall on the other side of it. The longer water sits, the farther this migration reaches into materials that are slow to dry once it has reached them.
The EPA's guidance puts mold growth on wet materials at as little as 24 to 48 hours, which is the practical reason extraction and drying start the same day instead of waiting for a scheduled appointment. Our hour-by-hour breakdown of that first day covers what to do while you wait for a crew and what should already be happening once one arrives.
The professional process: extract, dry, verify
Once a crew is on site, the work runs in a set order. Standing water comes out first, with extraction equipment that pulls water up through carpet and pad instead of skimming the surface. Anything that cannot be dried in place, saturated pad, ruined insulation, baseboard that is swelling, comes out at the same time, because those materials hold water against everything around them.
Drying comes next: air movers positioned to move air across wet surfaces, dehumidifiers pulling the moisture those air movers lift back out of the air. Then verification. A room that feels dry to the hand can still be wet inside the wall cavity or under the subfloor, so drying is not finished until moisture meters read the studs, subfloor, and drywall back to a normal range, not until the carpet feels dry underfoot. That gap is the difference between water damage restoration done to a standard and a few days of fans pointed at the floor.
What gets saved, and what does not
Some materials survive a water loss and some do not, and the difference usually comes down to how porous they are and how long they stayed wet. Hardwood floors, solid wood furniture, and clean-water carpet extracted the same day are often saved with prompt drying. Carpet pad is the exception: it is inexpensive open-cell foam that absorbs a large volume of water, and it is usually cheaper and faster to replace than to dry in place.
Drywall below the water line, wet insulation, and particleboard cabinetry rarely make it. Drywall wicks water upward past what is visible, and insulation loses its ability to insulate once it is compressed and saturated, whether or not it dries out later. Removing those materials early is not excess caution. It is what keeps a drying job from turning into a mold job three weeks later.
The exception: sewage and other contaminated water
Everything above assumes clean water, what the restoration industry classifies as Category 1: a supply line, a water heater, an overflowing tub. Water that backs up through a drain or a toilet, or that rises in from outside carrying whatever the ground was holding, is Category 3, grossly contaminated, and it changes the job completely.
Porous materials that absorb Category 3 water, carpet, pad, drywall, upholstery, cannot be reliably disinfected, so they come out rather than getting dried. The work also calls for protective gear and containment that a standard water loss does not need. If sewage or floodwater is involved, that is a job for sewage backup cleanup, not a mop and a fan.
When to handle it yourself, and when to call
A small clean-water spill is often fine to handle yourself: a dishwasher that overflowed onto a tile floor, or a supply line that dripped for an hour before anyone noticed. Mop it up, run a fan, and keep an eye on the area for the next couple of days. The water is clean, the area is small, and it was caught fast.
Call a professional when any of these apply: the water covers more than a small area, it has been sitting for more than a few hours, it came from a drain or from outside, or it has reached carpet, drywall, or a finished basement where you cannot see what is happening underneath. Hidden moisture is a bigger risk than what's visible. A floor that feels dry to bare feet can still be wet under the surface, and closing that gap is what moisture meters are for.
The insurance question
Whether this becomes an insurance claim depends on the cause and the size of the loss, and it is worth sorting out early rather than after cleanup starts. Sudden, accidental water damage is usually covered; a slow leak that ran for months usually is not. On claims that are covered, we bill the carrier directly, and a claim is not required to hire us. Plenty of jobs we do are paid directly by the homeowner, and after a free inspection we will tell you which way makes more sense for what you are looking at.
Related service
Water Damage Restoration in Northern New Jersey →IICRC-certified water damage restoration for homes and businesses across Northern NJ. We extract the water and dry the structure until moisture meters confirm it, then handle the repairs that follow. Based in Totowa.
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