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What Should I Do If My Business Floods Overnight?

Last updated October 25, 2026

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The short answer

Safety First

When you discover a flood in your business, your first priority is safety. Do not walk through standing water, especially if you suspect it may be contaminated or if there are electrical outlets or equipment nearby. Turn off the power to the affected area if it is safe to do so, and avoid using any appliances or switches until a professional checks them.

If you smell gas or hear hissing, leave the building immediately and call the gas company from outside. Also, be aware that floodwater can hide sharp objects, chemicals, or other hazards. Wear rubber boots and gloves if you must enter the area. If anyone feels unwell or has trouble breathing, seek medical attention promptly.

Document the Damage

Before you move anything or start cleanup, take photos and videos of the flooded areas. Capture the water level, damaged items, and any structural issues. This documentation is crucial for your insurance claim. Make a list of everything that was damaged, including furniture, equipment, inventory, and documents.

Keep any samples of water-damaged materials, like carpet or drywall, if your insurance company asks for them. Do not throw anything away until you have spoken with your insurer. Your insurance company will guide you on what to keep and what to discard. Remember, policies vary, and your insurer decides what is covered.

  • Take photos and videos of all affected areas
  • List damaged items and their approximate value
  • Note the water source and how long the flood lasted
  • Keep receipts for any emergency supplies you buy
  • Do not discard damaged items until you check with your insurer

Stop the Water Source

If the flood is from a burst pipe or an appliance leak, shut off the main water valve to stop the flow. If you are not sure where the valve is, check your building's maintenance plan or contact a plumber. For floods from heavy rain or groundwater, you may need to move items to higher ground and block entry points with sandbags.

In Detroit, knowing where your shutoff valve is located can save precious time during an emergency. Keep the location written down and share it with your employees. If the water is coming from outside, you may also need to clear gutters and drains to help water move away from your building.

Begin Cleanup Quickly

The longer water sits, the more damage it causes. Start removing water and drying out the space as soon as possible. Use pumps, wet vacuums, and fans to extract water and promote airflow. Move wet items to a dry area if you can, and remove carpets and padding that are soaked.

Mold can start growing within 24 to 48 hours, so acting fast is important. If the flooding is extensive or involves contaminated water, it is wise to call in local water damage pros. They have the equipment and experience to handle large-scale water removal and drying. You can also consider services like emergency water extraction or structural drying to speed up the process.

Prevent Mold and Further Damage

After the initial water removal, focus on drying the structure completely. Use dehumidifiers and air movers to reduce moisture in walls, floors, and ceilings. If you have wet drywall, you may need to cut it out and replace it to prevent mold growth. Check for hidden moisture in insulation and behind baseboards.

If you notice a musty smell or see any signs of mold, it is sensible to consult a mold professional. They can assess the situation and recommend safe removal. Also, consider having a water damage inspection and moisture mapping done to ensure the building is fully dry and safe. Taking these steps can help you get back to business sooner.

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Frequently asked questions

How soon should I contact my insurance company after a flood?

Contact your insurance company as soon as it is safe to do so, ideally within 24 hours. They can guide you on the claims process and what to document. Delaying might complicate your claim, so make the call promptly.

Can I clean up the flood myself?

For small floods with clean water, you might handle it yourself. But if the water is contaminated, the flood is large, or you have structural concerns, it is safer to hire professionals. They have the right equipment and expertise to prevent further damage and health risks.

What should I do with water-damaged equipment?

Do not use any electrical equipment that has been wet until it has been inspected and dried by a professional. Document the damage with photos and list the items for your insurance claim. Some items may be repairable, but others may need to be replaced.

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