Flood Preparedness Checklist: What to Do Before the Water Rises
July 9, 2026 · 3min read · Reviewed against FEMA & CDC guidance
Quick question most homeowners cannot answer: are you in a flood zone? Not "do you think you are," but have you actually looked your address up on FEMA's flood map? Most people have not, and flooding is the one disaster that touches every state. By NOAA's accounting, about 90 percent of U.S. natural disasters involve flooding.
The good news is that flood prep is mostly a list of small, cheap moves made on a dry afternoon. Here is the whole list, in the order that matters.
Step 1: Learn your actual risk
- Look up your address at FEMA's Flood Map Service Center (msc.fema.gov). Five minutes, free.
- If you are in a mapped zone, know that standard homeowners and renters insurance does not cover flooding. Flood insurance is separate and typically has a 30-day waiting period, so the week a storm is named is too late to buy it.
- Learn your evacuation routes to higher ground, and a backup, since the primary often crosses the same low spot everyone else is fleeing.
Step 2: Protect the things water destroys first
Water ruins paper and electronics long before it threatens people. An hour of prevention:
- Put IDs, deeds, insurance policies, and medical records in a waterproof container, or better, build a full emergency binder with copies and digital scans.
- Photograph every room of your home for insurance claims. Store the photos in the cloud.
- Raise what you can: electronics off the floor, keepsakes to upper shelves, and if you are in a repeat-flood area, ask an electrician about raising outlets and the water heater.
- Know how to shut off your electricity, gas, and water. Flooded wiring is a fire and shock hazard even after the water leaves.
Step 3: Stock supplies that assume no clean water
A flood supply list looks like a standard emergency kit with one twist: floods contaminate the water system, so plan for more stored water, not less.
| Supply | Amount for a family of 4 |
|---|---|
| Drinking water | 1 gallon per person per day, 2 weeks (56 gallons) |
| No-cook food | 2 weeks (floods regularly take out power too) |
| Water purification | Unscented bleach or purification tablets as backup |
| Light and power | Headlamps, lanterns, charged battery banks |
| First aid | Kit plus waterproof boots and work gloves for cleanup |
| Radio | Battery or hand-crank NOAA weather radio |
Boil-water advisories routinely follow floods and can last days. If the tap is questionable and your stored water runs low, our guide to emergency water purification covers the safe methods in order of preference.
Pack a go bag per person as well. Flash floods are the version of this disaster where you leave in minutes, not hours.
Step 4: Know the numbers that keep you alive
Flood deaths are mostly driving deaths, and the physics surprise people:
- 6 inches of moving water can knock an adult off their feet.
- 12 inches can float most cars.
- 18 to 24 inches carries away SUVs and trucks.
NOAA's rule is four words: Turn Around, Don't Drown. If water covers the road, you do not know how deep it is or whether the road still exists underneath. Reroute, every time.
Step 5: Know what to throw away afterward
The unglamorous part of flood recovery is the fridge and pantry audit. The USDA's guidance is strict for good reason, since floodwater carries sewage and chemicals:
- Discard any food that touched floodwater unless it is in a sealed, waterproof container (undamaged cans and retort pouches survive; screw-top jars and cardboard do not).
- Undamaged cans need washing and sanitizing before opening.
- If the power failed during the flood, the power outage food safety rules apply on top: 4 hours for the fridge, 24 to 48 for the freezer.
When in doubt, throw it out. Food is replaceable.
The checklist decays quietly
Here is the honest limitation of every flood checklist, including this one: it describes a moment in time. You do the work in July, feel prepared, and by next spring the water jugs are past their rotation date, the bleach has weakened (it loses effectiveness after about a year), and half the pantry got eaten during soccer season.
That slow decay is the problem Provision Planner was built for. Log your water, food, and supplies once, and it continuously shows how many days your household is covered for, flags what is expiring, and lets you run a flood scenario to see exactly where you would run short, before the forecast makes it urgent.
Frequently asked questions
- How do you prepare for a flood?
- Learn your flood zone, move valuables and documents up high, know your evacuation route, and stock two weeks of water and no-cook food assuming the tap is unsafe. Never drive or walk through floodwater, and leave early when told to.
- What supplies do you need for a flood?
- Two weeks of bottled or stored water, no-cook food, a first-aid kit, medications, waterproofed documents, flashlights, a battery radio, and rubber boots and gloves for cleanup. Assume clean tap water and power won't be available.
- Is it safe to drink tap water after a flood?
- Not until officials confirm it. Floodwater can contaminate wells and municipal supplies, so rely on stored water and follow any boil-water notice. When in doubt, boil for one minute or purify before drinking.
You did the reading. Now get your number.
Provision Planner does this article's math for your real household, automatically, and keeps it current as supplies come and go.