The First 24 Hours After Flooding: A Homeowner's Checklist

Quick answer: In the first 24 hours after a flood, work in order: stay safe first (electrical, contamination, and gas hazards), document all the damage before you clean up anything, then take reasonable steps to limit further damage. Remember that standard homeowners insurance excludes flooding — rising floodwater is covered only by separate flood insurance.

The first day after a flood decides a lot — how safe you stay, how much you eventually recover from insurance, and how much of your home can be saved. The order matters: safety first, documentation second, limiting damage third. Here’s how the first 24 hours should go.

Hour One: Safety Before Anything Else

Water damage is dangerous before it’s expensive. Before you think about belongings, work through the hazards:

Electricity. Do not touch electrical equipment if it’s wet or if you’re standing in water. The CDC’s guidance is direct: turn off the main power only if you can do it from a dry location — “if you must enter standing water to access the main power switch, then call an electrician.”^[2] Ready.gov adds that underground or downed power lines can electrically charge floodwater.^[1]
Contaminated water. Assume the water is dirty. The CDC notes floodwater can contain downed power lines, human and livestock waste, and household, medical, and industrial hazardous waste — “the best way to protect yourself is to stay out of the water,” and to avoid contact if you have an open wound.^[3]
Gas and carbon monoxide. If you smell gas, leave immediately and don’t do anything that could cause a spark. Never run a generator or any gasoline engine inside — or within 20 feet of — the home; the CDC warns this causes dangerous carbon monoxide buildup.^[2]
Structure. Return home only when authorities say it’s safe.^[1]

Key takeaway: No belonging is worth an electrocution or a carbon-monoxide exposure. If reaching the power shutoff means standing in water, stop and call a professional. Safety is the one step you never skip to save time.

Document Everything — Before You Clean Up

Once you’re safe, your camera is the most valuable tool you have. Before you move or throw anything away, photograph and video all the damage. The NFIP advises documenting flood-damaged property and recording the make, model, and serial numbers of appliances and electronics; keep samples of items like carpet and flooring, and only then discard what poses a health risk.^[4] The Insurance Information Institute makes the same point: photograph the damage before making repairs, and avoid throwing out damaged items until the adjuster has visited.^[5]

Limit the Damage — Your Policy Expects It

Documenting doesn’t mean waiting around. Most policies require you to take reasonable steps to prevent further damage — the “duty to mitigate.” As the III puts it, don’t wait for the adjuster to make temporary repairs that prevent further damage; most insurers will reimburse reasonable, necessary steps, so keep your receipts.^[5] In practice that means stopping the water source if you safely can and getting extraction and drying started — the front end of any water extraction and water damage restoration job.

This is also the moment the insurance distinction matters. Flood damage from rising external water is excluded under standard homeowners policies and needs separate flood insurance through the NFIP or a private insurer; sudden internal water damage from a burst pipe or appliance is usually covered.^[6] And because new flood policies generally carry a 30-day waiting period, that coverage has to be in place well before the water arrives.

What to Save, and What to Let Go

With safety and documentation handled, triage what’s in the house:

Move up what matters. Get irreplaceable documents, electronics, and valuables above the water line and into a dry space.
Throw out contaminated food. The CDC is blunt: discard food that may have contacted flood water, and perishable food left unrefrigerated — “when in doubt, throw it out.”^[2]
Expect to lose porous materials in contaminated water. Carpet, pad, and soaked drywall or insulation that black water touched usually can’t be safely saved — which ties directly to the water’s category (see Water Damage Categories).

When DIY Ends

Some parts of the first day are simply not do-it-yourself work. Call a professional when:

reaching the electrical shutoff means entering standing water, or the system needs checking before power goes back on;^[2]
the HVAC system was involved — the CDC says to have it checked and cleaned by a professional before running it again;^[2]
the water was sewage or other contaminated (Category 3) water — this is the domain of flood cleanup and sewage cleanup; or
the saturation is hidden or structural, where missed moisture becomes mold within the 24–48 hour window covered in Mold After Water Damage.

The first 24 hours reward staying calm and working in order: get safe, get it documented, stop the damage from spreading, and know where your own limits are. If you’re in that first day right now in Hattiesburg or the Pine Belt, request help or call — a real person answers, day or night, and can talk you through the safe next step.

Frequently Asked Questions

What should I do first after my house floods?

Safety before anything else. Don't enter standing water if the power might still be on — the CDC warns you can be electrocuted, and to shut off the main power only from a dry spot (call an electrician if you'd have to stand in water to reach it). Assume floodwater is contaminated, watch for gas leaks, and only re-enter when it's safe. Documentation and cleanup come after you're safe.

Should I clean up before the insurance adjuster comes?

Photograph and video everything before you move or remove anything — the NFIP and Insurance Information Institute both advise documenting damage first. But most policies also require you to take reasonable steps to prevent further damage, so stopping the water and starting to dry out is expected, not penalized. Keep receipts and, if you can, samples of damaged materials like carpet.

Does homeowners insurance cover flooding?

Generally no. Flood damage from rising external water is excluded under standard homeowners policies and requires separate flood insurance through the NFIP or a private insurer. Sudden internal water damage — a burst pipe or an appliance failure — is usually a covered peril. New flood policies also generally have a 30-day waiting period, so coverage has to be in place before the storm.