The 2026 Floods and More Than a Million Kitchens to Restore

According to Thailand's Department of Disaster Prevention and Mitigation (DDPM), in an update at 06:00 on 5 October 2026 reported by Daily News, flooding had affected 26 provinces plus Bangkok and 1,270,151 households. Most of these homes have their kitchens on the ground floor, the first place water reaches.

Floodwater is never clean. It carries sewage from drains, overflow from septic tanks, animal waste and road chemicals into the home. When it sits in cupboards, under sinks and on counters for days, gut germs from people and animals settle into every corner. The CDC is clear: food that may have touched floodwater should be thrown away, and food-preparation surfaces must be cleaned and then disinfected before use.

Example Case: A Curry-Rice Stall Owner Who Wants to Reopen Fast

Note: this is a typical scenario based on common post-flood situations, not the story of a specific customer.

Auntie Daeng has sold curry over rice from the front of a two-unit shophouse for almost twenty years. The kitchen behind the shop has a gas stove, a stainless sink, a chest freezer and shelves of pots and trays. Knee-deep water sat in the shop for several days. When it receded she found mud coating the floor, sacks of rice on the ground swollen with water, her big wooden chopping board stained deep black, plastic vegetable baskets with mud stuck in every hole, and a freezer that smelled foul after a long power cut.

With no income for days, she wanted to reopen immediately. Her son argued that they first needed to know which germs were in the kitchen, what had to go, and how to clean so customers would be safe. One case of customer food poisoning could undo twenty years of reputation in a single day.

How We Ranked Kitchen Germs After Floods

This is an editorial ranking by the World Health Disinfection (WHD) team, not an official ranking and not based on any particular set of case numbers. Our criteria:

1. Link to floods and sewage in WHO, CDC and Department of Disease Control guidance.
2. Chance of contaminating food or utensils via boards, hands, containers or washing water.
3. Severity: mild stomach upset versus serious dehydration needing hospital care.
4. Risk groups: effects on young children, older adults, pregnant women and people with chronic illness.
5. Hardiness: how well it persists on damp surfaces or food residue and how hard it is to wash off (described qualitatively).

A lower rank does not mean safe. Anyone with severe diarrhoea, frequent watery stools, heavy vomiting, high fever, bloody stools or signs of dehydration such as little urine, dry mouth or drowsiness should see a doctor right away.

No. 1: E. coli (Escherichia coli), the Signature of Sewage in the Kitchen

Why it ranks first: E. coli lives in human and animal intestines, so finding it signals faecal contamination. Sewage-laden floodwater spreads it across the kitchen. Some types cause severe diarrhoea, and certain types can affect kidney function in children. It scores highest on flood link and contamination risk.

Where it hides: grooves in wooden boards, dish sponges, hand towels, sink drains and strainers, fridge door seals, dish racks and perforated plastic baskets.

Symptoms and risk groups: diarrhoea, stomach cramps and nausea, sometimes bloody stools. Young children and older adults risk dehydration.

Prevention: discard wooden boards and sponges that sat in floodwater, wash hands with soap before cooking, and use clean or boiled water for washing dishes until authorities confirm tap water is safe.

How cleaning and spraying help: after scrubbing counters, sinks and floors, spraying reduces remaining bacteria on surfaces. E. coli belongs to the bacteria group the product says it covers, but we do not claim a specific test result for it; ask the team for test data.

No. 2: Salmonella, Food Poisoning From Meat, Eggs and Contaminated Water

Why it ranks second: Salmonella is one of the most common causes of food poisoning worldwide. It comes from raw foods such as chicken and eggs and from animal waste in floodwater. When the power fails and fridges warm up, fresh food becomes an ideal breeding ground.

Where it hides: fridge and freezer shelves where meat juices dripped, meat trays, and knives and boards used for raw meat.

Symptoms and risk groups: diarrhoea, cramps, fever, nausea and vomiting. Young children, older adults, pregnant women and immunocompromised people may be hit harder.

Prevention: discard fresh food from fridges that lost power for a long time or touched floodwater, keep separate boards for raw meat and cooked food, and cook thoroughly.

How cleaning and spraying help: WHD's product information states that CHEMGENE HLD4H covers Salmonella. Spraying around the fridge, prep counters and shelves after cleaning helps limit cross-contamination.

No. 3: Norovirus, the Fastest-Spreading Stomach Virus in Shared Kitchens

Why it ranks third: norovirus spreads extremely easily, a tiny amount can cause illness, and it is fairly hardy on surfaces. In shelter kitchens or volunteer kitchens cooking for hundreds, one sick cook can affect many people quickly.

Where it hides: cooks' hands, ladles, compartment trays, drinking-water containers, taps and areas where someone vomited.

Symptoms and risk groups: sudden vomiting, diarrhoea, cramps and sometimes mild fever. Most people recover in one to three days, but young children and older adults risk dehydration.

Prevention: anyone vomiting or with diarrhoea should not cook for others; wash hands with soap and water; clean up vomit carefully with gloves.

How cleaning and spraying help: WHD's product information states coverage of norovirus, making post-cleaning spraying of shared kitchens and bathrooms a good fit for restaurants, canteens and shelters reopening their kitchens.

No. 4: Hepatitis A Virus From Contaminated Food and Water

Why it ranks fourth: hepatitis A spreads through food or water contaminated with faeces. The WHO links it to unsafe water and poor sanitation, exactly the conditions after a flood. Symptoms do not appear immediately, so an infected cook may pass it on unknowingly.

Where it hides: unsafe ice and drinking water, raw vegetables rinsed in contaminated water, poorly washed utensils and cooks' hands.

Symptoms and risk groups: fatigue, fever, loss of appetite, nausea, abdominal pain, yellow skin or eyes and dark urine. Adults often have more symptoms than children; people with chronic liver disease need extra care.

Prevention: drink safe water, avoid ice of unknown origin, rinse vegetables in clean water, cook food thoroughly and ask a doctor about vaccination.

How cleaning and spraying help: hepatitis A belongs to the virus group the product says it covers, but we do not claim a specific test result; test data can be requested. Spraying prep surfaces after cleaning reduces hand-to-surface contamination.

No. 5: Shigella, the Cause of Dysentery, Passed Hand to Mouth

Why it ranks fifth: Shigella causes bacillary dysentery. A small dose can cause illness, and it spreads easily when toilets are out of action and handwashing water is scarce, as after floods.

Where it hides: unwashed hands, dish towels, shared food containers and uncooked dishes such as salads and som tam.

Symptoms and prevention: diarrhoea, possibly with mucus or blood, straining and fever; young children are a key risk group. Wash hands after the toilet and before preparing food, and avoid uncooked food while tap water is uncertain.

How cleaning and spraying help: Shigella belongs to the bacteria group the product says it covers; no specific test result is claimed. Spraying bathrooms and adjoining kitchens helps break hand-borne spread.

No. 6: Vibrio, From Brackish Water and Seafood

Why it ranks sixth: Vibrio parahaemolyticus lives in brackish and sea water and is linked to raw or undercooked seafood. Vibrio cholerae, which causes cholera, is something the WHO watches when water and sanitation break down. It is uncommon in Thailand, so it sits mid-table, but seafood restaurants and coastal homes should take care.

Where it hides: seafood trays and tubs, fish-cutting boards, and ice used to chill seafood.

Symptoms and prevention: diarrhoea, cramps and nausea; cholera can cause massive watery diarrhoea and severe dehydration requiring urgent care. Cook seafood thoroughly, use a separate board, and discard seafood left unchilled during power cuts.

How cleaning and spraying help: Vibrio belongs to the bacteria group the product says it covers; no specific test result is claimed, and data can be requested.

No. 7: Campylobacter, From Raw Chicken and Animal Waste

Why it ranks seventh: Campylobacter is a common bacterial cause of diarrhoea worldwide, usually from raw chicken and animal waste. Floodwater from areas with farms or animal pens can carry it.

Where it hides: boards used for raw chicken, hand towels and taps touched with meat-soiled hands.

Symptoms and prevention: diarrhoea, cramps and fever. Cook chicken thoroughly, separate raw-meat tools, and wash hands after handling raw meat.

How cleaning and spraying help: it belongs to the bacteria group the product says it covers; no specific test result is claimed.

No. 8: Rotavirus, a Risk to Young Children via Bottles and Feeding Items

Why it ranks eighth: rotavirus is a major cause of severe diarrhoea in young children, spreading via hands and contaminated surfaces. Bottles, teats and sippy cups washed in unsafe water are the risk points in a family kitchen.

Symptoms and prevention: vomiting, watery diarrhoea and fever, with dehydration risk. Vaccination as advised by a doctor protects children. Following CDC advice, throw away baby bottle nipples and pacifiers that touched floodwater, and wash bottles in clean water then boil or steam them.

How cleaning and spraying help: it belongs to the virus group the product says it covers; no specific test result is claimed. Spraying reduces germs on counters and bottle-prep tables, but items that go into a child's mouth should never be sprayed directly.

No. 9: Staphylococcus aureus, From Cooks' Hands to Food

Why it ranks ninth: this bacterium lives on the skin and in the noses of some people. If a cook with a hand wound or unwashed hands prepares food that then sits at room temperature, the germ can produce a heat-stable toxin. With power cuts and no refrigeration, pre-prepared relief meals are a risk point.

Symptoms and prevention: nausea, vomiting and cramps soon after eating. Cover hand wounds, wear gloves and do not leave cooked food standing for long.

How cleaning and spraying help: it belongs to the bacteria group the product says it covers; no specific test result is claimed.

No. 10: Mold in Dry Goods and Pantry Cupboards, Such as Aspergillus

Why it ranks tenth: rice, beans, dried chillies and spices that got damp grow mold quickly. Some molds, such as Aspergillus flavus, can produce aflatoxins that cooking does not destroy. Swollen wooden cupboards also host mold. It does not cause immediate diarrhoea like the others, but it is worth knowing.

Prevention: throw out all dry goods that touched floodwater or smell musty; do not pick out the parts that look fine. Discard or repair swollen, moldy cupboards.

How cleaning and spraying help: after removing spoiled goods and scrubbing cupboards, spraying reduces mold on hard surfaces. The product is stated to cover fungi as a group, but no species-specific result is claimed.

What to Throw Away and What You Can Wash and Reuse

• Throw away: any food that may have touched floodwater; food in containers that do not seal well, such as screw caps, plastic bags and cardboard; dented, swollen, leaking or rusted cans; fresh food from fridges without power for a long time; wooden boards and spoons, baby bottle nipples, sponges and deeply scratched plastic.
• Wash and reuse: undamaged commercially canned food, after removing labels, washing and disinfecting the cans; intact metal, glass and ceramic utensils, washed in soapy water and then sanitised with very hot water or another suitable method.
• Check first: fridges, microwaves and appliances that were submerged should be inspected by an electrician before plugging in.

Extra Care for Shelter Kitchens, Canteens and Volunteer Cooking Points

After a flood, many meals are cooked in places that were never designed as kitchens: temple halls, school canteens, community centres and roadside tents. Dozens of volunteers rotate through, ingredients arrive from many donors, and handwashing water may be limited. These conditions favour the germs at the top of this ranking, especially norovirus, Shigella and Staphylococcus aureus, which travel on hands. A few simple habits make a big difference: set up a handwashing station with soap before cooking starts, give every volunteer a clear rule that anyone with vomiting or diarrhoea stays out of food preparation, keep raw and cooked food on separate tables, and serve food soon after cooking rather than leaving trays standing for hours. When the relief operation ends and the building returns to normal use, scrub the area thoroughly and consider professional spraying before it becomes a school canteen or community kitchen again.

Why Dish Soap or Bleach Alone May Not Be Enough

Dish soap is designed to remove grease and food residue, not to disinfect sewage contamination. Washing is necessary but not the full job. Bleach mixed at the wrong strength or used on surfaces still carrying mud works less well, its fumes irritate airways, and it must never be mixed with ammonia or some bathroom cleaners. Kitchens also have many hidden spots: under the sink, behind the fridge, cabinet legs, tile grout and counter joints. Hand wiping rarely reaches everything, and one cloth used across the whole kitchen can move germs from floor to counter. That is why the WHO and CDC say clean first, then disinfect, and why fine-mist spraying by equipped technicians reaches surfaces more evenly.

WHD's Post-Flood Disinfection Spraying for Home and Restaurant Kitchens

WHD's disinfection spraying service uses trained technicians who spray and/or ULV-fog with CHEMGENE HLD4H, a UK medical-grade disinfectant containing Benzalkonium Chloride and Didecyldimethylammonium Chloride. According to the service information it is broad-spectrum against viruses, bacteria and fungi, with a stated 99.99% efficacy. The page lists the Department of Medical Sciences, Mahidol University, NHS England and EN 14476:2013+A2:2019, and customers including hospitals, schools, malls, offices and residential buildings.

1. Survey: waterline, damaged cupboards and equipment, sewage backflow points.
2. Mud removal and washing: discard food and items that must go; scrub counters, sinks, cupboards and floors first.
3. Zoning: remove or cover food, washed utensils and appliances; people and pets leave the area.
4. Spraying: floors, lower walls, under sinks, behind fridges, handles and hard surfaces.
5. Re-entry: wait the time the technicians advise (about 30 minutes per the service information), ventilate, and rinse direct food-contact surfaces with clean water as advised before cooking.

Spraying does not replace washing or discarding contaminated food, and we do not claim it leaves no residue. Anyone with severe diarrhoea or vomiting should see a doctor. Promotion per the service information: a free CHEMGENE spray bottle and WELLGIENIC wet tissues, with tax invoices available for businesses.

10 Reasons a Post-Flood Kitchen Deserves Disinfection Spraying

1. The kitchen is where sewage germs come closest to your mouth.
2. The disinfectant is stated to cover Salmonella and norovirus. See details
3. Fine mist reaches under sinks, behind fridges and into grout.
4. Reduces cross-contamination from floor to counter.
5. Restaurants can reopen with more confidence and tell customers the kitchen was disinfected.
6. No need to mix concentrated chemicals in a closed room.
7. Clear zoning and re-entry times. Talk to the team
8. Suits shared kitchens, canteens and shelters with many cooks.
9. Tax invoices available for businesses.
10. You can ask for test data on the germs that concern you.

Before and After

In the example case, Auntie Daeng discarded the rice, dry goods, wooden board and cracked baskets. Her son cleared mud and scrubbed, then booked spraying. The technicians had pots, plates and new stock moved out first and sprayed zone by zone. After the advised wait she rinsed food-contact counters with clean water and cooked her first pot of curry. Real results depend on damage and ongoing care.

Kitchen Recovery Checklist

• Check electrics and gas before use.
• Discard food that may have touched floodwater and fresh food from fridges without power.
• Discard wooden boards and spoons, nipples, sponges and scratched plastic.
• Use bottled or boiled water until tap water is confirmed safe.
• Scrub with soapy water before disinfecting.
• Leave the area during spraying and follow re-entry times.
• Rinse direct food-contact surfaces as advised after spraying.
• People with diarrhoea or vomiting should not cook for others.

FAQ: Kitchen Germs After Floods

Are submerged canned foods safe?

Undamaged commercial cans can be kept if you remove labels, wash and disinfect the cans before opening. Damaged cans must go.

Is this an official ranking?

No. It is WHD's editorial ranking using the criteria above.

Can disinfectant be sprayed onto plates directly?

Items that go in the mouth should be washed and sanitised with very hot water or as advised. Technicians focus on hard kitchen surfaces, and utensils should be removed first.

When should a restaurant book spraying?

Finish washing first, then schedule spraying for the day before reopening. The team will assess and advise timing.

Does it cover E. coli or hepatitis A?

They belong to the bacteria and virus groups the product says it covers, but no specific test result is claimed. Ask us for test data.

Make Your Post-Flood Kitchen Safe for Every Meal

Kitchen washed? Let World Health Disinfection spray the surfaces before you start cooking again.

Book Post-Flood Disinfection Spraying

Call 065-556-6294 | LINE @whd268

Related Services and References

• WHD Disinfection Spraying Service
• Residential and Building Ozone Disinfection
• Daily News, DDPM flood update at 06:00, 5 October 2026: https://www.dailynews.co.th/news/6249374/
• CDC Floods (food and water safety): https://www.cdc.gov/floods/
• WHO fact sheets: https://www.who.int/news-room/fact-sheets
• Department of Disease Control, Thailand: https://ddc.moph.go.th/