The Water Is Gone, but Germs Remain Where We Touch

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 affected 26 provinces plus Bangkok and 1,270,151 households. In each of those homes, floodwater touched objects we handle daily: doors, taps, stair rails and toys that floated around the room.

Floodwater carries sewage, animal urine and mud. When it recedes, it leaves a thin film on surfaces. Then hands that just shovelled mud or used the toilet carry germs on to other spots. High-touch points act like a central station where germs pass from one person to the next. The WHO and CDC advise cleaning and then disinfecting flood-contaminated surfaces, and high-touch points are the place to start.

Example Case: Shiny Floors, Sick Children

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

Ton and his wife rent a single-storey house in a canal-side community with two children aged three and five. Waist-deep water stayed in the house for several days, and the family slept at the community shelter. When the water dropped, they spent nearly a week clearing mud and pressure-washing floors and walls until the tiles shone, then brought the children home.

A few days later the younger child developed diarrhoea, followed by the older one, and Ton's wife felt nauseous. The doctor treated them and asked how the house had been cleaned. Ton realised he had scrubbed floors and walls thoroughly but never wiped the bathroom door handle, the toilet flush, the outdoor tap used to rinse boots, or the box of toys that had floated into a corner. Everyone touched those spots dozens of times a day. His next question: which points should come first, and how?

How We Ranked Germ Hotspots at Home After Floods

This is an editorial ranking by the World Health Disinfection (WHD) team. It is not official and is not based on swab testing in any particular home. Our criteria:

1. Touch frequency: how often household hands touch the point each day.
2. Chance of flood or waste contact: whether it was submerged, sits near sewage lines, or is handled by mud-covered hands.
3. Who touches it: whether toddlers who put hands in mouths, or older adults with weaker immunity, use it.
4. Difficulty of cleaning: grooves, crevices, joints or awkward materials.
5. Lingering moisture: whether it dries slowly, letting germs and mold persist (described qualitatively).

The germs mentioned for each point are those commonly linked to floods in WHO, CDC and Department of Disease Control guidance, such as E. coli, Salmonella, norovirus, rotavirus, hand-foot-mouth virus, Leptospira (leptospirosis) and molds. That does not mean every germ will be found in every home.

No. 1: Door Handles and Knobs, Especially Bathroom and Front Doors

Why it ranks first: everyone grips a door every time they come or go. During cleanup, mud-covered hands open the front door dozens of times, and the bathroom door is touched straight after toilet use. Submerged knobs also have grooves and mechanisms where mud lodges. It scores high on every criterion.

Likely germs: faecal germs such as E. coli and norovirus, respiratory viruses and skin bacteria such as Staphylococcus.

How to clean: scrub grooves with a brush and soapy water, rinse, dry, then disinfect. Repeat regularly through the first two or three weeks after the water recedes.

How spraying helps: technicians spray handles, door edges and lower frames after washing. The product information states coverage of norovirus; E. coli belongs to the bacteria group the product says it covers, without a specific test claim. Test data can be requested.

No. 2: Taps, Washbasins and Kitchen Sinks

Why it ranks second: people turn on taps with their dirtiest hands and turn them off with freshly washed ones, so germs jump straight back. Basins and sinks connect to drains that may have backed up during the flood, and they stay wet all the time.

Likely germs: E. coli, Salmonella, norovirus, and mold along grout lines.

How to clean: scrub taps, levers, aerators, strainers and basin rims, flush drains with clean water, dry, disinfect, and replace sponges and hand towels.

How spraying helps: fine mist reaches under sinks, pipe joints and the wall around basins. The product information states coverage of Salmonella and norovirus.

No. 3: Toilets, Flush Handles and Floor Drains

Why it ranks third: bathrooms are where sewage backs up most when septic tanks or drains overflow, so toilets and drains carry very high risk. Because most people already know the bathroom is dirty and scrub it first, it ranks third. The flush handle and the underside of the seat are what usually get missed.

Likely germs: E. coli, Shigella, norovirus, rotavirus and hepatitis A.

How to clean: wear rubber gloves and a mask, flush away residue, scrub the bowl, under the seat, the flush and drain covers, then disinfect. If the toilet will not drain, stop using it until the septic system is checked.

How spraying helps: spraying bathroom floors and walls after scrubbing reduces germs splashed around. Shigella, rotavirus and hepatitis A belong to groups the product says it covers, without specific test claims.

No. 4: Ground Floors and Lower Walls, Especially Where Toddlers Play

Why it ranks fourth: floors and lower walls had the most floodwater contact. Adults do not touch them much, but toddlers crawl, sit and put hands in mouths. Tile joints, skirting and corners trap sediment. Leptospira from rat urine can survive in standing water and damp soil, so corners where water still pools need care.

Likely germs: E. coli, Leptospira, Burkholderia pseudomallei in mud, and mold along skirting.

How to clean: remove all mud, scrub grout and skirting, dry as fast as possible and wear boots. Cover foot wounds, and see a doctor for fever or calf pain after wading.

How spraying helps: large areas are where fine-mist spraying beats hand wiping. Leptospira and Burkholderia belong to the bacteria group the product says it covers, without specific test claims.

No. 5: Light Switches and Sockets, a Germ and Electrical Hazard

Why it ranks fifth: switches are touched every time someone enters a room, often at night with unwashed hands. Low switches and sockets may have been submerged, yet they cannot be washed with water like other points, so they are often left untouched.

Likely germs: hand-borne germs such as norovirus, respiratory viruses and bacteria from mud.

How to clean: safety first. Switch off the breaker and have an electrician inspect submerged sockets and switches before use. Never pour water or spray liquid into sockets. Once cleared, wipe switch plates with a damp cloth carrying disinfectant.

How spraying helps: WHD technicians plan zones to avoid or protect electrical fittings and use the right method for each point, always after the electrician's check.

No. 6: Stair Rails, Balcony Rails and Gates

Why it ranks sixth: everyone grabs the stair rail while carrying belongings up and down during the flood, with wet, muddy hands, for days on end. Gates are handled by household members and outsiders such as volunteers and officials. Wooden rails and rusty metal have rough surfaces that are hard to wipe.

Likely germs: bacteria from mud and sewage, viruses from hands, and mold on wooden rails.

How to clean: scrub with soapy water, dry and disinfect. Let swollen wooden rails dry completely before repainting or sealing.

How spraying helps: long rails are covered more evenly and quickly by spraying than by wiping section by section.

No. 7: Fridge, Cupboard and Drawer Handles

Why it ranks seventh: these handles connect germs directly with food. Fridges without power for days often have spoiled food juices on door seals, while swollen wooden cupboards hold moisture inside.

Likely germs: Salmonella, E. coli, Campylobacter and mold.

How to clean: discard spoiled food, wash every shelf and seal, scrub handles and drawers, and let wooden cupboards dry before restocking, or discard them if mold runs deep.

How spraying helps: it reduces germs on exterior surfaces, handles and the floor around cupboards after washing. The product information states coverage of Salmonella and fungi. Food must always be removed before spraying.

No. 8: Dining Tables, Counters and Chairs

Why it ranks eighth: after a flood, the dining table becomes the place to put everything: boots, cleaning buckets, wet documents and items just pulled from the mud, before it goes back to holding dinner plates. Submerged table and chair legs have joints where mud lodges.

Likely germs: bacteria from mud and sewage, norovirus, and mold on wooden furniture.

How to clean: keep a separate work table for cleanup, wash the top, underside and legs, and discard upholstered chairs that were soaked.

How spraying helps: it reaches the underside and legs. After spraying and the advised waiting time, wipe food areas with clean water before use.

No. 9: Remote Controls, Phones and Children's Toys

Why it ranks ninth: these small objects are among the most handled things in a home, and toys go straight into children's mouths. Toys that floated may look clean once dry, but rubber toys with holes can hold floodwater inside. They score high on who touches them, but they are easy to deal with item by item, so they rank ninth.

Likely germs: hand-foot-mouth virus, rotavirus, RSV and sewage bacteria.

How to clean: throw away soaked soft toys and rubber toys with holes. Wash hard plastic toys in soapy water, disinfect and rinse. Wipe remotes and phones with products suitable for electronics.

How spraying helps: the service information states coverage of hand-foot-mouth virus and RSV, so spraying play areas after cleaning reduces germs around children. Toys that go in mouths should be rinsed with clean water after disinfection.

No. 10: Boots, Buckets, Mops and Cleaning Tools

Why it ranks tenth: cleaning tools touch more mud and sewage than anything else, yet many households forget to wash them, then store them indoors or carry the same mop into other rooms, spreading germs from dirty areas to freshly cleaned ones. They are handled less often than other points, so they rank last, but they are a major spreader.

Likely germs: E. coli, Leptospira, Burkholderia pseudomallei and mold in mop heads that never dry.

How to clean: keep separate tools for bathroom, kitchen and general floors, wash boots outside, launder and fully dry mop heads, and discard any that rot or smell.

How spraying helps: when the team sprays your home, the tool storage area and boot-washing spot can be included in the plan.

Summary of the Ranking

1. Door handles and knobs
2. Taps, basins and sinks
3. Toilets, flush handles and drains
4. Ground floors and lower walls
5. Light switches and sockets
6. Stair rails, balcony rails and gates
7. Fridge, cupboard and drawer handles
8. Dining tables, counters and chairs
9. Remotes, phones and toys
10. Boots, buckets and cleaning tools

A Sensible Order of Work: From Dirtiest to Cleanest

The ranking tells you which points matter most, but the order in which you clean them matters too. Work from the dirtiest zone toward the cleanest, and from high to low, so that dirty water and grime never drip onto areas you have just finished. A practical sequence for most homes looks like this. Start outside with boots, buckets and tools, setting up a rinsing spot by the door so mud stays out. Move to the bathroom next, because it carries the heaviest sewage load, and finish with the floor drain. Then tackle the kitchen, discarding spoiled food before scrubbing sinks, handles and counters. After that, clean living areas and bedrooms, working on door handles, rails, switch plates (once an electrician has cleared them) and furniture. Leave floors in each room for last, then mop your way out of the room toward the exit. Change cloths and rinse water between zones, and wash your hands each time you move from one zone to the next. When every room is washed and drying, that is the right moment to book spraying, so the disinfectant goes onto surfaces that are already clean.

Why Wiping High-Touch Points Yourself Often Falls Short

The first problem is order: many households wipe touch points before finishing mud removal, then muddy hands recontaminate them. The second is the single cloth: wiping the bathroom handle and then the dining table with the same cloth moves germs around. The third is contact time: most disinfectants must stay wet on a surface for the time the manufacturer specifies, and a quick wipe dried immediately may not work fully. The fourth is bleach mixed at the wrong strength, which corrodes metal knobs and taps and must never be combined with ammonia or certain bathroom cleaners.

Finally there is the sheer number of points. One house has dozens of high-touch spots, and covering every one after days of shovelling mud is hard. The WHO and CDC say clean first, then disinfect. Bringing in a team with proper equipment and a clear checklist reduces the chance of missing key spots.

WHD's Post-Flood Disinfection Spraying for High-Touch Points

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, listing COVID-19, RSV, H1N1, H5N1 and hand-foot-mouth virus, with a stated 99.99% efficacy. The page lists the Department of Medical Sciences, Mahidol University, NHS England and EN 14476:2013+A2:2019.

1. Survey: technicians walk the home, noting waterlines, high-touch points and sewage backflow spots.
2. Mud removal and washing: the owner or a cleaning crew washes surfaces first.
3. Zoning: breakers off where appropriate, electrics protected, food and toys removed; people and pets leave.
4. Spraying: all ten hotspot groups on the checklist, plus floors and lower walls.
5. Re-entry: wait the time technicians advise (about 30 minutes per the service information), ventilate, then use the space.

Spraying does not replace washing, drying or electrical checks; we do not claim it leaves no residue, and anyone ill should see a doctor. Promotion per the service information: a free CHEMGENE spray bottle and WELLGIENIC wet tissues, handy for ongoing wiping of touch points, with tax invoices available.

10 Reasons to Book Spraying for High-Touch Points After a Flood

1. High-touch points are the main route from house to hands to mouth.
2. Technicians follow a checklist, so key spots are not missed. See service details
3. Fine mist reaches knob grooves, under sinks and table legs.
4. The disinfectant is stated to cover norovirus, Salmonella and hand-foot-mouth virus.
5. Electrical fittings are avoided systematically.
6. No single cloth moving germs around the house.
7. Suits homes with toddlers and older adults. Talk to the team
8. Wet tissues included for follow-up wiping.
9. Works for homes, condos, offices and shops.
10. You can request test data for germs that concern you.

Before and After

In the example case, after the children were treated, Ton discarded soaked soft and rubber toys, had an electrician check ground-floor sockets, re-scrubbed knobs, taps and the toilet, then booked spraying. The family waited outside during the work, returned at the time advised and now wipe touch points every evening. Results in each home depend on damage and ongoing care.

High-Touch Checklist After the Water Recedes

• Switch off breakers and have an electrician check submerged switches and sockets.
• Finish mud removal before wiping touch points.
• Use separate cloths and tools for bathroom, kitchen and living areas.
• Brush grooves in knobs, taps and flush handles.
• Discard soaked soft toys and rubber toys with holes.
• Leave the zone during spraying and follow re-entry times.
• Wipe high-touch points regularly through the first weeks.
• Wash hands with soap after cleaning and before eating.
• See a doctor for fever, diarrhoea or calf pain after wading.

FAQ: Germ Hotspots at Home After Floods

The floors are clean, so why worry about touch points?

Germs mainly reach the body through hands that touch these points and then the mouth, nose or eyes, not through floors, except for toddlers who crawl.

Is the ranking based on lab testing?

No. It is WHD's editorial ranking based on touch frequency, flood contact, who touches, cleaning difficulty and lingering moisture.

Can disinfectant be sprayed on light switches?

Never into sockets or switches. An electrician must check first, then wipe with a damp cloth. WHD technicians plan around electrics.

How long should we keep wiping after spraying?

Wipe high-touch points regularly at least through the first weeks home, and whenever someone is ill.

Does it cover leptospirosis bacteria?

Leptospira belongs to the bacteria group the product says it covers, but no specific test result is claimed. Ask for test data, and see a doctor for fever after wading.

Stop Everyday Touch Points From Passing Germs Around

House washed? Let World Health Disinfection spray the high-touch points throughout your home.

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: 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/