Phasi Charoen and the Late-September 2026 Bangkok Floods: What the Reports Say

Citywide, Thai PBS reported more than 300 mm of rain in roughly 48 hours on 25 and 26 September 2026, with all 50 districts declared disaster areas on 26 September and DDPM assistance zones covering 38 districts and 118 subdistricts on 29 September. Bangkok Biz News cited DDPM data from 6 October putting affected Bangkok households at about 329,000. Figures change daily.

For Phasi Charoen specifically, Thai PBS reported that on 29 September 2026 DDPM listed all seven subdistricts as flood assistance zones. Siam Rath reported that on 4 October 2026 the district was one of 22 districts with moderate to heavy rain.

These sources give no street-level depths, so we will not guess or invent figures. What we can say is that the whole district was on the assistance list and kept getting rain, enough for slow drainage, drain backflow and lasting indoor damp.

Flood Points in Phasi Charoen as Reported

• Bang Duan, Khlong Khwang, Khuha Sawan, Bang Chak, Bang Waek, Bang Wa and Pak Khlong Phasi Charoen: listed by DDPM as flood assistance zones on 29 September 2026 (Thai PBS).
• Phasi Charoen District as a whole: among 22 districts with moderate to heavy rain on 4 October 2026 (Siam Rath).

Picture repeated heavy rain, slow drainage and humidity rather than window-high water. That is not automatically safer: ankle-deep backflow can carry sewage onto a kitchen floor, and days of damp are enough for mould.

Example Case: A Two-Storey Canal House in Khuha Sawan and a Morning Market Stall

The following is an example case based on situations that commonly follow heavy rain. It is not a real person's account.

Aunt Sri, in her sixties, lives in a two-storey wooden house beside a canal in the Khuha Sawan area, with the kitchen and storeroom on the concrete ground floor. In late September it rained hard for several nights, the canal rose, and foul-smelling water pushed up through the kitchen floor drain, sitting on the ground floor for about a day and a half.

Once it dried, she and her son found green mould on a rice sack, a musty cupboard under the stairs and tide marks on the canal-side wall. A few days later her visiting grandson had diarrhoea, and she was coughing whenever she cooked downstairs. At her market stall, the drain behind the stalls had overflowed and rats were more visible than usual. "I scrubbed with bleach," she asked, "so why does it still smell, and which germ matters most?" This ranking tries to answer that question.

Ranking Criteria for the Phasi Charoen Post-Flood Germ Ranking

1. Link to floods and standing water: how often the germ or group appears in post-flood guidance from WHO, CDC and the Department of Disease Control.
2. Fit with the setting: canal-side humidity, drain backflow, fresh markets with food and rats, and closed rooms in residential buildings.
3. Severity: the chance of serious illness or needing a doctor.
4. Local at-risk groups: older people in long-held family homes, young children, people with chronic conditions, and vendors who handle wet floors daily.
5. Persistence and spread: described qualitatively, without unsupported numbers.

This is a cleanup planning tool, not a diagnosis. Fever, calf pain, persistent diarrhoea or an inflamed wound after floodwater contact means seeing a doctor.

Post-Flood Germ Ranking Phasi Charoen 2026: The Top 10

No. 1: Mould from Lingering Damp in Canal Homes (Cladosporium and Aspergillus)

Why it ranks here: Wooden or half-timber canal homes sit beside water all year, and after repeated rain moisture lingers in timber and plaster. CDC advises cleaning and drying within 24 to 48 hours to limit mould, which is hard beside a canal.

Where it hides: under floorboards, under-stair cupboards, rice sacks, cardboard, curtains, mattresses and canal-facing walls.

Symptoms and risk groups: coughing, sneezing, a blocked nose, itchy eyes and tight breathing. People with asthma or allergies and older adults notice it first; people with weakened immunity should take particular care, as Aspergillus can affect the lungs.

Prevention: remove wet items to dry or discard, open windows, run fans or a dehumidifier, wear a mask and gloves, and throw away porous items with heavy growth.

How cleaning and spraying help: scrub visible mould first. Once surfaces are dry, spraying helps treat remaining growth in hard-to-reach places. The CHEMGENE HLD4H product information states it covers fungi, but spraying does not fix the source of damp, so leaks and ventilation must be dealt with too.

No. 2: Market and Kitchen Bacteria (Salmonella and Escherichia coli)

Why it ranks here: In neighbourhoods where fresh markets and food stalls sit close to homes, drain water rising onto market floors or kitchens spreads bacteria from sewage and spoiled food onto chopping boards, containers and prep areas just as people rush to reopen.

Where it hides: meat and seafood stall floors, ice chests, fridges that lost power, wooden boards, hand towels and rear drainage channels.

Symptoms and risk groups: diarrhoea, stomach cramps, nausea, vomiting and sometimes fever. Young children and older adults can become dehydrated; use oral rehydration salts and see a doctor if things do not improve.

Prevention: discard food that was soaked or kept in a fridge without power for a long time, wash then sanitise utensils, replace soaked wooden boards and keep raw and cooked foods apart.

How cleaning and spraying help: the CHEMGENE HLD4H product information lists Salmonella among covered organisms. E. coli falls within the bacteria group the product says it covers, but we have no organism-specific test result to quote; businesses can ask WHD for test data directly.

No. 3: Stomach Viruses in Homes with Young Children (Norovirus and Rotavirus)

Why it ranks here: both spread very easily through hands, food and surfaces soiled by stool or vomit. Many households are multi-generational, with grandparents and small children under one roof. When a ground-floor bathroom is flooded by backflow, viruses from sewage can end up on toys and the floor where toddlers crawl.

Where it hides: bathroom floors, toilets, taps, door handles, plastic toys on the floor and ground-floor dining tables.

Symptoms and risk groups: sudden vomiting, watery diarrhoea and cramps. Small children and older adults dehydrate quickly; drowsiness, little urine or a very dry mouth mean a doctor is needed straight away.

Prevention: wash hands with soap and clean water often, give a sick person a separate bathroom if possible, wash soiled linen separately and clean high-touch points daily.

How cleaning and spraying help: the CHEMGENE HLD4H product information lists norovirus among covered organisms; rotavirus belongs to the virus group the product says it covers. After washing the bathroom floor and touch points, spraying reaches corners a mop misses.

No. 4: Leptospira (Leptospirosis) Along Canal Banks and Behind Markets

Why it ranks here: the Department of Disease Control warns about leptospirosis with almost every flood. It spreads from rat urine through cuts or long-soaked skin, and canal banks and market backs already attract rats. No report describes long wading here, so it is not first, but vendors and people working near water remain at risk.

Where it hides: mud on canal banks, rear market walkways, under stalls, storerooms and puddles along rat runs.

Symptoms and risk groups: sudden high fever, headache, muscle pain especially in the calves, and red eyes. People with foot or leg wounds who wade are most at risk. Anyone who develops a fever within a few weeks of wading should see a doctor and mention the water contact.

Prevention: wear rubber boots and gloves, cover cuts with waterproof dressings, rinse off with clean water after contact, store food waste in sealed bins and remove rat harbourage.

How cleaning and spraying help: Leptospira is a bacterium, within the group the product says it covers, but we have no organism-specific result to quote. After mud removal, spraying surfaces along rat paths reduces surface risk; the main protection is still keeping broken skin out of standing water.

No. 5: Pseudomonas aeruginosa in Condo Bathrooms, Basins and Drains

Why it ranks here: in condos the post-rain problem is rarely flooded units but bathrooms, drains, car parks and bin rooms. Pseudomonas loves damp and forms biofilm in pipes.

Where it hides: bathroom drains, basins, shower heads, kitchen sponges, shared bin rooms and basement car parks that held water.

Symptoms and risk groups: healthy people rarely become seriously ill, but people with wounds, contact lens users, people with diabetes and those with weakened immunity can develop wound, skin, eye or ear infections.

Prevention: scrub drains and grates, change sponges often, run taps for a while before use and keep wounds clean and dry.

How cleaning and spraying help: Pseudomonas falls within the bacteria group the product says it covers, without an organism-specific result we can quote. For juristic persons managing condos, spraying common areas after washing reassures residents.

No. 6: Hepatitis A Virus from Ice, Food and Utensils

Why it ranks here: hepatitis A spreads through food or water contaminated with faeces and is a standard post-flood warning because water and sanitation systems are disrupted. Where there are many street stalls, ice sellers and food vendors, one contamination point can affect many people.

Where it hides: ice buckets on the floor, utensils rinsed in dirty water, poorly washed vegetables and food handlers' hands.

Symptoms and risk groups: tiredness, poor appetite, nausea, fever, yellow skin or eyes and dark urine. Adults usually feel worse than children; people with existing liver disease should be careful. Ask a doctor about vaccination.

Prevention: drink bottled or boiled water, eat freshly cooked food, wash hands before preparing food and keep ice containers off the floor.

How cleaning and spraying help: hepatitis A sits within the virus group the product says it covers, without a specific result we can quote. Food businesses should wash equipment first, then have surfaces and surrounding areas sprayed; food-contact items must be rinsed as the technician advises before reuse.

No. 7: Infected Cleanup Wounds (Staphylococcus aureus, Streptococcus) and Tetanus Risk

Why it ranks here: after heavy rain, many households lift furniture and rip out rotten timber, so scrapes and nail punctures are common. Skin and soil bacteria can enter wounds exposed to dirty water. Tetanus comes from Clostridium tetani in soil and rust, so deep wounds need attention.

Where it hides: rotten wood, nails, corrugated metal, broken glass, drain mud and reused unwashed gloves.

Symptoms and risk groups: swelling, redness, heat, pain, pus or fever. People with diabetes and older adults heal slowly. After a deep or dirty wound, ask a doctor about tetanus vaccination.

Prevention: wear thick gloves and closed shoes, rinse wounds with clean water at once, cover them with clean gauze and keep them out of standing water.

How cleaning and spraying help: these bacteria fall within the covered group, without organism-specific results to quote. Spraying lowers germs on household surfaces but is not wound care; surface disinfectants must never be used on the body.

No. 8: Influenza and RSV in Closed Rooms During Long Spells of Rain

Why it ranks here: long rain keeps people indoors with windows shut, so respiratory viruses spread easily. RSV matters most for babies and older adults.

Where it hides: door handles, remotes, phones, stair rails, lift buttons and tables in condo common areas.

Symptoms and risk groups: fever, cough, sore throat, runny nose and aches. Babies breathing fast and older adults with high fever should see a doctor promptly.

Prevention: wash hands often, wear a mask when sick, air rooms when the rain stops and ask a doctor about the annual flu vaccine.

How cleaning and spraying help: the service and product information list RSV, influenza H1N1 and H5N1 among covered organisms. Spraying common areas and shared touch points reduces surface contamination; airborne spread still depends on ventilation and masks.

No. 9: Campylobacter on Chopping Boards and Flooded Kitchens

Why it ranks here: Campylobacter travels with raw poultry. When a kitchen takes backflow and the fridge fails, thawed meat contaminates nearby surfaces. Good hygiene prevents most cases, hence ninth.

Where it hides: chopping boards, knives, sinks, thawed freezers and reused cloths.

Symptoms and risk groups: diarrhoea, sometimes bloody, cramps and fever. Young children, older adults and pregnant women should watch for dehydration.

Prevention: discard meat that thawed during a long outage, cook poultry thoroughly, separate raw and cooked boards and clean the sink after washing raw meat.

How cleaning and spraying help: Campylobacter falls within the covered bacteria group, without a specific result we can quote. Spraying floors, walls and cupboards after degreasing reduces leftover surface contamination.

No. 10: Athlete's Foot and Skin Fungi (Dermatophytes)

Why it ranks here: vendors standing on wet market floors all day, and anyone wearing damp shoes day after day, are prone to athlete's foot and ringworm between the toes. It is usually mild but uncomfortable and can open the way for bacteria.

Where it hides: undried boots, doormats, shared towels and bathroom floors.

Symptoms and risk groups: soggy, peeling, itchy, red skin between the toes. People with diabetes need careful foot care and should see a doctor for swelling or sores.

Prevention: wash and dry feet thoroughly, dry shoes, avoid sharing towels and change socks daily.

How cleaning and spraying help: dermatophytes belong to the fungi group the product says it covers, without a specific result we can quote. Spraying bathroom floors and entrances reduces build-up; skin symptoms need treatment from a doctor or pharmacist.

Why Soap, Bleach or Mopping Alone Is Not Enough

Washing with soapy water is essential because it removes the mud where germs shelter, but CDC and WHO advise cleaning first and then disinfecting surfaces touched by floodwater. DIY efforts fall short because mops miss corners under cabinets and between floorboards, bleach is easily mixed too weak or too strong (and must never meet ammonia or acids), contact time is too short, porous wood and plaster hold germs deep inside, and air fresheners or fresh paint only mask the problem.

WHD Post-Flood Disinfection Spraying for Phasi Charoen

World Health Disinfection (WHD) is based in Bang Khae District, Bangkok 10160, on the same Thonburi side as Phasi Charoen. Bookings are made by phone on 065-556-6294 or LINE @whd268. Scheduling depends on demand at the time; the team confirms a date after reviewing your site, and we do not promise same-day visits.

According to the service page, trained technicians spray and/or ULV-fog (Ultra Low Volume fine mist) using CHEMGENE HLD4H, a medical-grade disinfectant from the UK containing Benzalkonium Chloride and Didecyldimethylammonium Chloride. It states coverage of viruses, bacteria and fungi including COVID-19, RSV, influenza H1N1, H5N1 and hand-foot-mouth virus, claiming 99.99%; the product page adds norovirus, Salmonella, Bordetella pertussis and mycobacteria. The page cites the Department of Medical Sciences, Mahidol University, NHS England and EN 14476:2013+A2:2019; ask for documents.

Service Steps

1. Enquiry and survey: share building type, size, backflow points and photos on LINE.
2. Mud removal and washing first: remove mud, rubbish and wet items, wash surfaces and let them dry reasonably well.
3. Zoning and preparation: pack away food, utensils, toys and personal items. People, pets and plants leave the zone.
4. Spraying: floors, walls, furniture, touch points, bathrooms and kitchens, or ULV for larger spaces.
5. Waiting and re-entry: the service page says to wait about 30 minutes before normal use. Always follow the technician's re-entry time on the day and ventilate first.

Spraying comes after mud removal and cleaning. It does not replace repairs, drying or medical care, and we do not claim it leaves no residue. Rinse food-contact items as advised, and anyone who feels unwell should see a doctor. As listed on the service page, customers receive a free CHEMGENE spray bottle and WELLGIENIC wet wipes, and tax invoices are available.

10 Reasons Phasi Charoen Homes, Markets and Condos Should Disinfect After Waterlogging

1. All seven subdistricts were assistance zones, so every part of the district should check backflow and waterlogged spots.
2. Heavy rain returned on 4 October, giving mould and bacteria more time.
3. Drain backflow carries sewage, even when only ankle-deep.
4. Spraying and ULV reach corners mops miss through the disinfection spraying service.
5. Medical-grade CHEMGENE HLD4H, stated to cover viruses, bacteria and fungi.
6. Restaurants and stalls reopen with confidence and can explain their routine to customers.
7. Suits condo juristic persons managing car parks, bin rooms, lifts and lobbies.
8. Protects older adults and young children, who spend the most time at home.
9. A Thonburi-side team in neighbouring Bang Khae; book via the service page, phone or LINE.
10. Clear steps and tax invoices for homes and businesses that need hygiene records.

Before and After Spraying

Checklist for Phasi Charoen Homes, Shops and Condos

Before spraying

• Photograph damage before moving anything.
• Wear rubber gloves, boots and a mask while cleaning.
• Remove mud, rubbish and heavily mouldy porous items.
• Wash floors, lower walls and drains.
• Open windows and use fans to dry surfaces.
• Throw away soaked food or food from fridges that lost power for a long time.
• Pack away utensils, food and children's toys.
• Tell the technician about backflow points, smells and rat signs.

After spraying

• Wait for the technician's re-entry time before people and pets return.
• Ventilate, and rinse food-contact items as advised.
• Keep controlling humidity and check weekly for new mould.
• Fix leaks, check backflow valves and clear the drain outside.
• Watch for fever, diarrhoea or infected wounds and see a doctor if they appear.

FAQ: Post-Flood Germ Ranking for Phasi Charoen

How deep was the flooding in Phasi Charoen?
Our sources give no street-level depths. They report that DDPM listed all seven subdistricts as assistance zones on 29 September 2026 and that the district had moderate to heavy rain again on 4 October 2026, so we will not guess.

No water came in, but the bathroom drain backed up. Should I disinfect?
Yes. Backflow often contains sewage. Wash the floor and area around the drain first, then disinfect.

How long must we stay out?
The service page says about 30 minutes before normal use, but follow the technician's instructions. Nobody, including pets, stays in the zone during spraying.

Does the disinfectant kill leptospirosis bacteria?
Leptospira is in the bacteria group the product says it covers, but we have no specific test result to quote; ask the team for technical documents. Boots and keeping wounds out of water remain the key protection.

Get Your Phasi Charoen Home or Shop Clean Again

Mud gone? Let WHD handle the disinfection step next.

Book Post-Flood Disinfection

Call 065-556-6294 | LINE @whd268

Related Services and Sources

• Disinfection spraying service
• CHEMGENE HLD4H disinfectant
• Residential ozone disinfection for musty air

References

• Thai PBS (29 Sep 2026), Bangkok flood assistance zones: source
• Siam Rath (4 Oct 2026), moderate to heavy rain in 22 districts: source
• Thai PBS, Bangkok rainfall late September 2026: source
• Bangkok Biz News, DDPM affected households: source
• CDC floods: source
• WHO fact sheets: source
• Department of Disease Control, Thailand: source