The first hour decides how much of this becomes a repair instead of a rebuild. In order: make it safe, stop the source, document it, and get the water out.
What should I do in the first hour after water damage?
Put safety first: call 911 for immediate danger, stay out of water near outlets or submerged cords, and do not enter a flooded basement unless you know electricity is off. Stop the source only if it is safe, then photograph the loss before disposal and begin the drying response. Wet areas and materials should be dried within 24–48 hours to help prevent mold growth. EPA drying guidance
Best first-hour response
- Safety situations: water by electricity, gas odor, sewage, a flooded basement, or a ceiling leak.
- Documentation situations: standing water, damaged finishes, appliances, furniture, and belongings you may need to discard.
- Drying situations: any wet floor, wall, ceiling, carpet, or content that can be safely addressed.
- Get people away from danger and call 911 when there is immediate danger.
- Stop the source only when doing so does not require entering unsafe water.
- Photograph the loss, then begin water removal and drying safely.
First-hour decision table
| What you find | First priority | Likely next step |
|---|---|---|
| Water near outlets, cords, or electrical equipment | Stay out of the water and do not switch power on or off while standing in it. | If reaching the breaker requires entering water, call an electrician or utility. CDC electrical safety guidance |
| Gas odor or suspected gas leak | Leave the house immediately and avoid anything that can create a spark. | Notify the gas company, police, fire department, or state fire marshal; do not return until told it is safe. CDC reentry safety guidance |
| Standing water on a floor | Document it before moving belongings or removing water, if safe. | Move into water extraction and then drying. |
| Sewage or contaminated water | Avoid contact and do not bathe in water that may be contaminated. | Use sewage-backup cleanup steps; wear protective equipment if cleanup is necessary. CDC floodwater safety guidance |
| Wet drywall, carpet, or ceiling materials | Record the damage and start the drying decision promptly. | Dry within 24–48 hours or decide what must be removed. EPA drying guidance |
First-hour safety checklist
- Call 911 for immediate danger, fire, gas odor, medical emergency, or an unsafe electrical condition.
- Do not enter a flooded basement unless you are sure the electricity is off. FEMA flooded-basement safety guidance
- Do not enter water near outlets, submerged cords, electrical equipment, sparks, or buzzing noises. National Weather Service flood safety
- Do not use generators, pressure washers, or gasoline-powered engines indoors, in a garage, or near doors, windows, or vents. CDC generator safety guidance
- Stop the water source only if it is safe to reach the shutoff without entering unsafe water.
- Photograph and video structural damage, water levels, appliances, furniture, and items before moving or disposing of them. FEMA claim-start guidance
- Do not bathe in water that may be contaminated with sewage or toxic chemicals. CDC floodwater safety guidance
- Begin water removal and drying safely; aim to dry wet areas and items within 24–48 hours. Minnesota Department of Health drying guidance
What is the 24–48 hour drying window?
It is the period in which wet areas and materials should be dried to help prevent mold growth. EPA says that if wet or damp materials are dried within 24–48 hours after a leak or spill, mold generally will not grow. EPA mold guidance
What counts as documentation before disposal?
Documentation includes photographs and video of the property, structural damage, standing water levels, appliances, furniture, and items that may be discarded. For larger appliances, record make, model, and serial number; keep material samples when possible. FEMA documentation guidance
First-hour questions
Should I turn off the electricity after a leak?
Turn off power at the main breaker or fuse panel if circuits or equipment got wet, but only if you can reach it without entering standing water. If you would have to enter water to reach the switch, do not do it yourself; call an electrician or utility. Never turn power on or off while standing in water. CDC electrical safety guidance
Can I use a generator to run drying equipment indoors?
No. Never use a generator, pressure washer, or other gasoline-powered engine inside a home, basement, garage, carport, or other enclosed space, or less than 20 feet from a door, window, or vent. These engines can create dangerously high carbon-monoxide levels. CDC generator safety guidance
What should I photograph before cleanup?
Photograph and video the source, structural damage, standing water levels, appliances, furniture, and all property you plan to discard before moving or removing it. Make a list of damaged items with purchase date, value, and receipts where possible. Keep material samples from damaged carpet, flooring, wallpaper, or drapes for the adjuster. FEMA claim-start guidance
What if the water is from a sewer backup?
Avoid contact with sewage-contaminated water, which can contain dangerous bacteria. Do not bathe in water that may be contaminated with sewage or toxic chemicals. In Anoka, if a sewer backup affects all drains or there is no water, call the City at 763-576-2923 during business hours or 763-576-2860 after hours. CDC floodwater safety guidance · City of Anoka sewer guidance
What if a frozen pipe is only dripping?
A trickle from a faucet can indicate a frozen pipe, often near an exterior wall or where the water service enters the foundation. Keep the faucet open and thaw with an electric heating pad, hair dryer, portable space heater kept from flammable material, or towels soaked in hot water. Never use an open flame. American Red Cross frozen-pipe guidance
Next, use emergency cleanup guidance, structural drying information, Minnesota claim steps, or ceiling water-damage guidance for the specific problem.
Sources: CDC, EPA, FEMA, Minnesota Department of Health, National Weather Service, and City of Anoka.
Safety, in this order
- Electricity first. If water has reached outlets, cords, a submerged appliance or the panel, stay out of the room. Do not stand in water to reach a breaker.
- Gas next. If you smell gas, leave and call from outside.
- Structure. Do not walk under a sagging ceiling or on a floor that feels soft.
- Contamination. Assume anything from a floor drain, toilet or sewer line is contaminated — see sewage backup cleanup.
Then stop the source
Supply line break
Close the main shutoff, then open a low faucet to relieve pressure.
Appliance overflow
Close the valve behind or beneath the unit and unplug it if it is safe to reach.
Sewer backup
Stop using water entirely, and call the City of Anoka: 763-576-2923 business hours, 763-576-2860 after hours.
Sump overflow
Check the float and the discharge line for a block or a freeze before anything else.
Document before you clean
- Photograph and video every affected room before moving anything, including inside cabinets and closets.
- Photograph the source itself — the split pipe, the failed pump, the appliance.
- Write down when it started and when it was found.
- Keep damaged items until they have been documented and released.
Then get water out fast: extraction and drying are what stop the loss from growing.
What not to do
- Do not use a household vacuum on standing water.
- Do not run the HVAC system if it may have taken on water or if contamination is present.
- Do not put fans on a contaminated area — you are moving contamination around the building.
- Do not discard damaged property before it is documented for the claim.
- Do not close a wall back up because the surface feels dry.
Asked and answered
Direct answersWhat should I do in the first hour after water damage?
Make it safe first: stay out of standing water near outlets, cords or the panel, and away from a sagging ceiling. Stop the source at the fixture valve or the main shutoff. Photograph every affected room before moving anything. Then get extraction and drying started the same day.
What should I not do after water damage?
Do not use a household vacuum on standing water, do not run the HVAC system if it may have taken on water or if contamination is present, do not point fans at a contaminated area, do not discard damaged property before it is documented, and do not close a wall back up because the surface feels dry.
How soon can mold grow after water damage?
Under favourable temperature and moisture conditions, microbial growth can begin within roughly 24 to 48 hours. That window is why same-day extraction and continuous drying matter more than any other decision made after a water loss.