The Map Yang Phon Flood, Pluak Daeng, September 2026

According to Siam Rath (siamrath.co.th) on 25 September 2026, heavy rain fell all night, and runoff from the Phatthana reservoir, located in Moo 5 of Map Yang Phon subdistrict, flowed continuously into the Map Yang Phon community. The same report warned that if the rain kept falling the water would rise further, and asked people to avoid flooded routes.

The report did not give a water depth or a count of affected homes, so this article does not guess at either. The details describe the situation on the reporting date, and conditions change daily. Please follow the latest notices from Pluak Daeng district, the local administrative organisation and the Rayong provincial disaster prevention office.

Nationally, the Department of Disaster Prevention and Mitigation (DDPM) reported, with data as of 06:00 on 7 October 2026 published by the Government Public Relations Department, that floods had affected 27 provinces plus Bangkok, covering 123 districts and 984 subdistricts, with 1,154,875 households and more than 3.1 million people affected. Map Yang Phon is one part of a much larger recovery happening across the country.

Reservoir runoff matters for germs: it flows with force, carrying sediment and debris, pushes drains and septic tanks to overflow, and sends families into crowded temporary shelter where respiratory and diarrhoeal germs spread easily.

A Typical Scenario: Ground-Floor Rooms Where the Water Would Not Stop

Note: an illustrative example case based on situations commonly seen in communities that mix rented rooms and detached houses. It is not the story of any real person in Map Yang Phon.

Nun owns a single-storey row of eight rented rooms in the community. Most tenants are working families with small children, and some rooms house grandparents too. On the night the rain would not stop, cloudy water began flowing across the front yard before dawn and soon ran through every room, not standing still but moving continuously, leaving branches and rubbish caught on the fence.

Several families took their children to relatives, while others crowded into a neighbour's house on higher ground. Within two or three days, several children had fever, coughs and runny noses, and one child had mouth sores. Adults who waded back to move belongings had cuts on the soles of their feet from stepping on wood, and some had diarrhoea after eating food that had been stored in the rooms.

When the water dropped, every room had a thin layer of silt on the tiles, a damp band along the lower walls, mattresses on the floor soaked through, swollen plywood wardrobes, a sewer smell from the bathroom drains, and a musty odour in rooms that had stayed shut. Tenants asked Nun, "When can the kids sleep here again?" Making the rooms healthy starts with understanding where each germ comes from.

Flood Germs in Map Yang Phon, Pluak Daeng: Ten to Watch For

Reservoir runoff is fresh water that passes over soil, plants and land around the community before mixing with wastewater from drains. The germs of concern therefore include freshwater bacteria, gut bacteria and viruses, respiratory viruses that spread in crowded conditions, and fungi. The information below is general knowledge in line with WHO, CDC and Thailand's Department of Disease Control, not a diagnosis. Anyone with symptoms should see a doctor.

1. Leptospira spp. (leptospirosis)

How the flood spreads it: rats living in drains, rubbish heaps and overgrown land are flushed from their burrows, and their urine mixes with the water flowing through homes. Some rats also move up into ceilings and storerooms.

Where it hides: puddles behind houses, drainage channels, wet sediment in room corners and anywhere rat droppings appear.

Symptoms and risk: sudden high fever, headache, calf pain and red eyes, sometimes progressing to jaundice or reduced urine. People who wade for long periods, have foot wounds or clean without boots are most at risk.

Prevention: rubber boots and gloves, covered wounds, washing hands and feet afterwards, and seeing a doctor promptly for any fever in the weeks after wading.

2. Aeromonas hydrophila, a freshwater bacterium

How the flood spreads it: Aeromonas occurs naturally in fresh water such as reservoirs, ponds and canals. When reservoir water floods a community, these bacteria travel with it and can enter the body through wounds during wading.

Where it hides: water left in containers, puddles around homes, wet sediment and soaked equipment.

Symptoms and risk: wound infections that become red, swollen, painful and spreading, and sometimes diarrhoea if contaminated water is swallowed. People with liver disease, diabetes or weak immunity face more serious illness.

Prevention: avoid wading with open wounds, rinse any cut with clean water immediately, keep it covered and dry, and see a doctor if it becomes inflamed quickly. Aeromonas belongs to the bacteria group the product information says it covers; ask WHD if you need test data for this specific organism.

3. Pseudomonas aeruginosa, the moisture-loving bacterium

How the flood spreads it: Pseudomonas lives in soil and water and thrives in wet places. After a flood it can settle on damp surfaces, waste pipes, kitchen sponges and musty cloths.

Where it hides: bathroom drains, sinks, sponges, rags and materials that have not dried.

Symptoms and risk: skin infections, inflamed hair follicles, outer ear infections and wound infections. People with chronic wounds, weak immunity or bedridden patients using medical devices need extra care.

Prevention: throw away flooded sponges and cloths, keep bathrooms dry, clean then disinfect drains and basins, and keep wounds clean. It is in the bacteria group; ask WHD for organism-specific test data.

4. Shigella spp. (bacillary dysentery)

How the flood spreads it: Shigella passes from faeces to mouth and is highly infectious even in small amounts. When toilets and septic tanks overflow and people share bathrooms in temporary shelters, person-to-person spread rises.

Where it hides: flush handles, taps, bathroom door handles, water scoops and shared containers.

Symptoms and risk: diarrhoea that may contain mucus or blood, cramping and fever. Young children and older adults are at risk of dehydration.

Prevention: wash hands with soap after the toilet and before eating, avoid sharing utensils, and clean then disinfect bathrooms often. It is in the bacteria group; ask WHD for specific test data.

5. Norovirus, the vomiting and diarrhoea virus

How the flood spreads it: norovirus spreads through contaminated food and water and through touching contaminated surfaces, and it moves very quickly where people are crowded together, such as post-flood shelters.

Where it hides: bathrooms, dining tables, dishes, fridge handles and any spot where someone vomited.

Symptoms and risk: sudden vomiting, diarrhoea, stomach pain and nausea. Children, older adults and people with chronic illness can become dehydrated.

Prevention: wash hands with soap and water, clean up vomit wearing gloves, and then disinfect the area. Norovirus is one of the organisms WHD's product information lists as covered.

6. Hand, foot and mouth disease viruses (enteroviruses including EV71 and coxsackievirus)

How the flood spreads it: common in young children, it spreads through saliva, nasal fluid, blister fluid and stools. When children from several families share a relative's house or a shelter and play with the same toys, it passes easily and can return home on belongings.

Where it hides: toys, bottles, feeding spoons, children's mattresses and floors where babies crawl.

Symptoms and risk: fever, mouth ulcers, and rash or blisters on the palms, soles and buttocks, mostly in children under five. A child who is drowsy, vomiting often or showing unusual neurological signs needs a doctor urgently.

Prevention: keep sick children home with their own belongings, wash hands after nappy changes, and wash then disinfect toys. Hand-foot-and-mouth virus is named on WHD's service page.

7. Influenza viruses (such as H1N1)

How the flood spreads it: flu does not come from floodwater itself, but floods push people into crowded rooms, tiredness and poor sleep, and the late rainy season is already a busy time for respiratory illness. It spreads through cough and sneeze droplets and contaminated surfaces.

Where it hides: door handles, light switches, remote controls, phones, tables and shared items.

Symptoms and risk: fever, body aches, cough, sore throat and fatigue. Older adults, young children, pregnant women and people with chronic illness risk complications and should ask a doctor about yearly vaccination.

Prevention: mask when sick, wash hands, separate the sick person, and wipe-disinfect shared touch points. WHD's service information lists influenza H1N1 and H5N1.

8. Respiratory syncytial virus (RSV)

How the flood spreads it: RSV is a respiratory virus common in the rainy season, spread by droplets and by hands that touch contaminated surfaces. Crowded shelters and damp homes make it easy for young children to catch.

Where it hides: cot rails, toys, blankets and surfaces adults touch before picking up a baby.

Symptoms and risk: runny nose, cough and fever; infants may breathe fast, struggle to breathe or wheeze, which needs a doctor straight away. Older adults are also at risk.

Prevention: wash hands before holding babies, keep infants out of crowds where possible, and clean then disinfect the nursery. RSV is named on WHD's service page.

9. Candida albicans in damp skin folds

How the flood spreads it: Candida is a yeast that normally lives on the body, but skin that stays wet for long periods, such as hands soaked all day while cleaning or skin folds kept in damp clothes, lets it overgrow into a rash.

Where it hides: damp clothes, towels, mattresses that never fully dried and rubber gloves worn for hours.

Symptoms and risk: red, itchy rash between fingers, in the groin, under the breasts, or nappy rash in babies. People with diabetes, bedridden older adults and infants are more prone.

Prevention: dry the skin, change clothes often, sun-dry laundry, and see a doctor or pharmacist if a rash persists. The product information states coverage of fungi in general.

10. Indoor moulds in closed rooms (Penicillium spp. and Cladosporium spp.)

How the flood spreads it: rented rooms and houses shut during evacuation get no airflow. When walls and plywood soak up water, Penicillium and Cladosporium moulds grow as green, grey or black spots within days. WHO and CDC advise cleaning and drying quickly, generally within 24 to 48 hours.

Where it hides: behind wardrobes, under floor mattresses, wooden door frames, wallpaper and air conditioners that pull in damp air.

Symptoms and risk: sneezing, blocked nose, itchy eyes, coughing and asthma flare-ups, especially in people with allergies or asthma, older adults and children.

Prevention: open doors and windows, remove porous items with mould, wipe hard surfaces wearing a mask, gloves and goggles, and disinfect once the room is dry. If a musty smell remains, consider the residential ozone disinfection service as an add-on.

The big picture: after reservoir runoff in Map Yang Phon, the germs to watch include freshwater and moisture bacteria (Aeromonas, Pseudomonas), a rat-borne germ (Leptospira), person-to-person diarrhoea germs (Shigella, norovirus), crowding viruses (hand-foot-and-mouth, influenza, RSV) and fungi on skin and in rooms. Effective recovery follows an order: protect yourself, wash, dry, then disinfect.

Why Washing the Rooms Is Not Enough After the Map Yang Phon Runoff

• Floor cleaners lift dirt but are not designed to disinfect, so a floor that looks clean may still carry germs.
• Rented rooms share walls, and if they are not cleaned together, mould and odour can spread from one room to the next.
• There are many shared touch points, such as gates, communal taps, stair rails and parking areas, which are often forgotten.
• Home-mixed chemicals are risky; CDC warns never to mix bleach with ammonia or other cleaners.
• Disinfectants need contact time, and a quick wipe may not achieve it.
• Tenants must return to work, leaving little time for thorough cleaning.

For room owners and families with young children, having a professional team spray after cleaning means every room is handled systematically at the same time.

WHD Post-Flood Disinfection Spraying for Homes and Rented Rooms in Map Yang Phon

According to the service information, World Health Disinfection (WHD) uses trained technicians who spray and/or apply ULV (Ultra Low Volume) fogging, a fine mist that spreads through a room and suits spaces with many corners and furniture.

The disinfectant is CHEMGENE HLD4H, a medical-grade disinfectant from the United Kingdom containing Benzalkonium Chloride and Didecyldimethylammonium Chloride. According to the product information it is broad-spectrum, covering viruses, bacteria and fungi. Organisms named on WHD's pages include SARS-CoV-2 (COVID-19), RSV, influenza H1N1, H5N1, hand-foot-and-mouth virus, norovirus, Salmonella, mycobacteria and fungi. The service page states 99.99% effectiveness, and the product page states 99.85% against COVID-19 within one minute. The service page also lists Thailand's Department of Medical Sciences, Mahidol University, NHS England and EN 14476:2013+A2:2019, and customers such as hospitals, schools, malls, airports, offices, airlines, banks and residential buildings.

Being clear about efficacy: of the germs in this article, norovirus, hand-foot-and-mouth virus, influenza H1N1 and RSV are named on the website. Leptospira, Aeromonas, Pseudomonas, Shigella and Candida are not named directly; they belong to the bacteria or fungi groups the product information says it covers, and WHO and CDC advise cleaning then disinfecting flood-contaminated surfaces. Ask the WHD team if you need test data for a specific organism.

Service in Rayong: WHD is based in Bang Khae, Bangkok 10160, with no branch in Rayong. Jobs in Pluak Daeng and nearby areas are arranged by phone or LINE; the team asks about room numbers, size and post-flood condition before booking a date, which depends on the schedule and road conditions.

The Five-Step Post-Flood Spraying Process

1. Survey: share details and photos by phone or LINE, such as how many rooms, which ones house babies or older people, and where there is odour or mould.
2. Remove silt and wash first: clear debris and ruined items, wash floors and walls with water and detergent, and let air flow until dry.
3. Zoning: each rented room, bathroom, kitchen and common area becomes a zone so nothing is missed.
4. Spraying: technicians apply CHEMGENE HLD4H by spray and/or ULV mist across floors, walls, doors, taps and shared touch points. Occupants and pets must leave the zone being sprayed.
5. Re-entry: according to the service information, wait about 30 minutes after spraying before normal use. Follow the time the technicians give on the day, and ventilate.

Promotion per the service information: a free CHEMGENE spray bottle and WELLGIENIC wet wipes with the service, and a tax invoice is available.

10 Reasons to Disinfect Map Yang Phon Homes and Rented Rooms After the Water Drops

1. Continuous inflow carried sediment and dirt from around the reservoir into every room.
2. Fresh water brings bacteria such as Aeromonas that can infect wounds.
3. Overflowing drains and septic tanks may spread faecal germs such as Shigella in bathrooms.
4. Many small children return at once, raising the risk of hand-foot-and-mouth disease and RSV, both named in the service information.
5. Rooms shut for days invite mould; disinfecting after drying reduces what remains.
6. ULV mist reaches corners cloths cannot. See the disinfection service
7. A medical-grade product used in hospitals and public buildings, per the service information.
8. Trained technicians reduce the risk of misusing chemicals.
9. Owners can cover every room in one booking. Book the service
10. Confidence for families moving back, especially with infants, older adults or immunocompromised members.

Before and After Spraying

Note: spraying reduces germs on surfaces; it does not replace repairs, replacing damaged materials, or medical care.

Example Case: An Owner Who Wanted Tenants Back With Confidence

Continuing the illustrative scenario above; not a real customer review.

After the water dropped, Nun asked all tenants to clear wet mattresses and mouldy items on the same day, wash the floors, and leave every door and window open for two days. She then sent photos and a room plan to the team on LINE. On the booked day, the technicians worked room by room, starting with rooms that housed small children, then bathrooms, and finally common areas such as the yard, gate and taps. Tenants waited outside the active zone and returned at the time given. A tenant with a foot wound was advised to see a doctor to check it and review tetanus vaccination.

Recovery Checklist for Map Yang Phon, Pluak Daeng

• Follow local notices; if rain continues the water may rise again, so avoid flooded routes.
• Have electrics checked before use and never touch plugs while wet.
• Wear boots, rubber gloves and a mask, and cover wounds before cleaning.
• Discard food, drinking water, medicines, sponges and soft toys that touched floodwater.
• Wash floors and walls with water and detergent, and never mix chemicals.
• Let rooms dry fully before booking spraying.
• During spraying, people and pets leave the zone and return at the stated time.
• Watch everyone's health for several weeks; see a doctor for fever, calf pain, severe diarrhoea, a wheezing child or an inflamed wound.

FAQ: Post-Flood Disinfection in Map Yang Phon

The water was not in for long. Do we still need spraying?
Water that passed through drains and septic tanks can carry faecal germs. With small children, older people or patients at home, cleaning then disinfecting reduces the risk.

Do we need to wash before spraying?
Yes. Spraying comes after silt removal and washing.

When can we go back in?
According to the service information, about 30 minutes after spraying; always follow the technicians' time on the day.

Can WHD serve Pluak Daeng?
WHD is in Bang Khae, Bangkok, with no branch in Rayong. Book upcountry service at 065-556-6294 or LINE @whd268; dates depend on the schedule and roads.

Can spraying replace seeing a doctor?
No. It reduces germs on surfaces and does not treat illness.

Map Yang Phon Can Be a Healthy Place to Live Again: We Help Prevent and Eliminate Post-Flood Germs

Bacteria, viruses or fungi: once you have washed the rooms, let the WHD team spray with CHEMGENE HLD4H, broad-spectrum according to the product information, for houses and every rented room.

Book Post-Flood Disinfection Now

Call 065-556-6294  |  LINE @whd268

World Health Disinfection, Bang Khae, Bangkok 10160. Upcountry bookings by phone and LINE.

Related Links and References

• Disinfection spraying service: https://www.worldhealthdisinfection.com/en/disinfection-service
• CHEMGENE HLD4H: CHEMGENE HLD4H product page
• Residential ozone disinfection: https://www.worldhealthdisinfection.com/en/residential-ozone-disinfection
• Siam Rath, Phatthana reservoir runoff into Map Yang Phon (25 September 2026): https://siamrath.co.th/regional/324047
• Government Public Relations Department, DDPM flood summary (data as of 7 October 2026, 06:00): https://www.prd.go.th/th/content/category/detail/id/33/iid/548715
• 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/