The Ongkharak Flood: Wat Arun Rangsi, Bang Luk Suea and Bang Sombun

According to Daily News on 5 October 2026, heavy rain fell in Nakhon Nayok from 24 to 27 September 2026. Khun Dan Prakan Chon Dam held 218.66 million cubic metres, or 97.61% of capacity, and had to release water into the Nakhon Nayok River, flooding four districts including homes, resorts and temples. The Wat Arun Rangsi area in Bang Luk Suea and Bang Sombun, Ongkharak, was among the affected locations. The report also noted six relief kitchens, for example at Sai Mun subdistrict at Wat Khlong Nueng.

Nationally, the Government Public Relations Department, citing the Department of Disaster Prevention and Mitigation (DDPM) as of 06:00 on 7 October 2026, reported flooding in 27 provinces plus Bangkok, covering 123 districts and 984 subdistricts, with 1,154,875 households and more than 3.1 million people affected. Figures change daily.

What does this mean for germs? First, the water crossed wide farmland, gathering animal dung, rat urine, paddy mud and household wastewater. Second, dam-release floods usually stand longer than rain floods, so materials soak for days. Third, temples and relief kitchens gather evacuees, volunteers and monks closely together, which helps germs pass from person to person. This article does not claim any germ was found in Ongkharak; it uses the event as an example of conditions WHO and CDC warn about.

A Typical Scenario: A Farming Family Beside the Temple

Note: this is an illustrative example based on common situations in riverside farming communities, not the account of any real person or temple.

Uncle Som farms rice in Ongkharak. His raised wooden house stands a few hundred metres from the village temple. Under the house is a small chicken coop. He lives with Aunt Daeng, who has diabetes, their daughter and a two-year-old grandson.

After days of rain, news came that the dam was releasing more water. The fields joined into one sheet of water, the coop went under and water rose through the space under the house to the upper floor. The family moved to the temple hall with several neighbours. Aunt Daeng helped the temple kitchen cook hundreds of meal boxes a day. Uncle Som rowed back to check the house daily, despite a scrape on his shin from a submerged fence nail.

When the water receded, the house was coated with mud, the ground under it was full of paddy silt mixed with chicken droppings, black mould spotted the floorboards and the mattresses were heavy and foul. The grandson developed a fever and mouth sores, Aunt Daeng's foot wound was slow to heal and Uncle Som had aching calves. Anyone with such symptoms should see a doctor first.

Germs That Come With Floodwater in Ongkharak, Nakhon Nayok: Eleven From Fields, Pens, Kitchens and Temple Halls

A farmland river flood differs from city flooding: paddy-soil germs, livestock and poultry germs, germs in mass-cooked food, germs that spread in shelters, and mould on wooden houses and temple buildings. The information below is general guidance based on WHO, CDC and the Thai Department of Disease Control, not a diagnosis or treatment advice. Anyone unwell should see a doctor.

1. Leptospira spp. (leptospirosis)

How floods spread it: field rats live in paddies and rice stores, and cattle, buffalo and pigs can also shed the bacteria in urine. River water spreading over the fields carries it everywhere, and rats escaping the flood move into houses and temple halls.

Where it hides afterwards: wet mud under houses, paddy bunds, puddles, animal pens, rice stores and corners with rat droppings.

Symptoms and who is at risk: sudden high fever, headache, calf pain and red eyes, from a few days to about four weeks after exposure. Farmers, livestock keepers, people who row or wade often and anyone with leg wounds are most at risk.

Prevention: rubber boots and gloves, waterproof dressings, soap washing and a prompt doctor visit for fever or calf pain after wading.

2. Burkholderia pseudomallei (melioidosis)

How floods spread it: this bacterium lives naturally in soil and surface water and is common in Thai rice-growing areas. Floods stir up paddy mud, and people who wade or clean mud bare-handed can be infected through wounds or by inhaling contaminated spray.

Where it hides afterwards: paddy silt left under houses, in yards, along temple paths and in muddy puddles.

Symptoms and who is at risk: fever, skin abscesses, cough or pneumonia, and sometimes serious bloodstream infection. People with diabetes, kidney disease, heavy drinking or weak immunity are at particular risk.

Prevention: boots and gloves whenever handling mud, covered wounds, and people with diabetes should avoid wading in mud. See a doctor for prolonged fever or wounds that will not heal. Avoiding direct soil contact is the main defence; indoor spraying only supports it after mud removal.

3. Salmonella enterica (food poisoning from food and poultry)

How floods spread it: Salmonella lives in the gut of poultry, pigs and other animals. Flooded coops and pens spread droppings, and relief kitchens cooking at scale risk contaminated ingredients, eggs and equipment.

Where it hides afterwards: chopping boards, pots, prep tables, fridges that lost power and coop areas.

Symptoms and who is at risk: diarrhoea, cramps, fever and vomiting within hours to days; young children, older adults, pregnant women and people with weak immunity can become seriously ill.

Prevention: cook eggs and meat thoroughly, separate raw and cooked boards, wash hands, discard flood-touched food, and clean then disinfect kitchen surfaces. WHD's product information lists Salmonella among the organisms CHEMGENE HLD4H covers.

4. Bacillus cereus (food poisoning from rice left standing)

How floods spread it: B. cereus lives in soil and dust and comes in on raw rice and grains. Its spores survive cooking. When kitchens cook rice in bulk and leave it at room temperature for hours, the spores germinate and form toxins.

Where it hides afterwards: large rice cookers, rice trays, pre-packed meal boxes, flood-soaked rice and dust in temporary kitchens.

Symptoms and who is at risk: nausea and vomiting a few hours after eating, or diarrhoea and cramps; usually short-lived, but children and older adults should be watched for dehydration.

Prevention: this is a food-handling problem, not a spraying problem, because spores resist heat and common disinfectants. Serve freshly cooked food quickly, keep food properly hot or cold, discard flood-soaked rice and wash pots and trays before every batch.

5. Campylobacter jejuni (from coops and contaminated water)

How floods spread it: Campylobacter is abundant in chicken intestines. Rural homes that keep chickens under or beside the house see droppings mixed into floodwater and left on floors and containers.

Where it hides afterwards: the ground under houses, yards, water jars, rainwater tanks and boards used for cutting chicken.

Symptoms and who is at risk: diarrhoea, sometimes bloody, cramps and fever, usually two to five days after exposure; children and older adults need attention for dehydration.

Prevention: cook chicken thoroughly, do not use flooded water jars until cleaned and disinfected, remove droppings and silt from under the house and wash hands after handling poultry.

6. Rotavirus (child diarrhoea in shelters)

How floods spread it: rotavirus is a leading cause of diarrhoea in young children, spreading by the faecal-oral route on hands, toys and surfaces. Crowded temple halls with shared toilets spread it easily.

Where it hides afterwards: mats, children's bedding, toys, feeding bottles, hall floors, shared toilets and nappy-changing spots.

Symptoms and who is at risk: vomiting, watery diarrhoea and fever; under-fives dehydrate quickly. A drowsy child, little urine or refusal to drink needs a doctor at once. Infant vaccines exist; ask a doctor.

Prevention: handwashing after nappy changes and before feeding, boiled bottles, cleaned toys, and disinfected toilets and play areas.

7. Enterovirus (hand, foot and mouth disease)

How floods spread it: hand, foot and mouth disease peaks in the rainy season and spreads through saliva, nasal mucus, blister fluid and stools. Children sharing toys and sleeping close together in shelters face higher risk.

Where it hides afterwards: toys, shared spoons and cups, rails, toilet doors and children's play areas.

Symptoms and who is at risk: fever, sore mouth and mouth ulcers, spots or blisters on palms, soles and buttocks, most often in under-fives. Drowsiness, repeated vomiting or unusual neurological signs need urgent medical care.

Prevention: keep sick children apart, wash hands often, avoid sharing cups and spoons, and clean then disinfect toys and surfaces. WHD's service information lists hand-foot-mouth virus among the organisms its disinfectant covers.

8. Influenza virus (in crowded shelters)

How floods spread it: influenza does not come with the water itself, but floods crowd people into small, damp spaces, so the virus spreads through coughs, sneezes and shared surfaces.

Where it hides afterwards: rails, door handles, shared dining tables, cups, phones and shared blankets.

Symptoms and who is at risk: high fever, body aches, cough, sore throat and fatigue; older adults, pregnant women, young children and people with diabetes, lung or heart disease face complications. An annual vaccine is available; ask a doctor.

Prevention: masks when sick, covering coughs, handwashing, spacing sleeping areas where possible and disinfecting shared surfaces. WHD's service information lists influenza H1N1 and H5N1 among covered organisms.

9. Pseudomonas aeruginosa (wet surfaces and wounds)

How floods spread it: Pseudomonas loves moisture and lives in soil and water. It thrives on surfaces that stay wet, such as sponges, mattresses and pipes, so homes and resorts soaked for days suit it well.

Where it hides afterwards: mattresses, kitchen sponges, damp towels, bathroom drains, shower heads and basins in resort rooms.

Symptoms and who is at risk: infected wounds with greenish-blue pus, itchy skin rashes and ear infections; people with weak immunity, burns or who are bedridden can be more seriously affected and should see a doctor.

Prevention: discard flood-soaked mattresses and sponges, dry laundry completely, flush stagnant water from pipes before use, and clean then disinfect wet surfaces.

10. Entamoeba histolytica (amoebic dysentery)

How floods spread it: this protozoan spreads as tough cysts in faeces that survive in water and soil. Floodwater passing septic pits and open rainwater tanks can carry cysts into drinking and washing water.

Where it hides afterwards: water jars, rainwater tanks, flooded home-grown vegetables and unwashed hands.

Symptoms and who is at risk: diarrhoea with mucus or blood and cramps, sometimes long-lasting; pain under the right ribs with fever needs a doctor.

Prevention: boil drinking water or use bottled water, wash vegetables in clean water, and clean water jars before refilling. Cysts are not a main target of surface spraying, so safe water and hand hygiene matter most.

11. Stachybotrys chartarum (black mould on wood and paper)

How floods spread it: this black mould favours cellulose-rich materials that stay wet, such as wood, plywood, paper, gypsum and fabric. Raised wooden houses, wooden halls, monks' quarters and resort rooms soaked for days are ideal. CDC advises cleaning and drying within 24 to 48 hours to limit mould.

Where it hides afterwards: gaps between floorboards, lower wooden walls, wooden cabinets, books and documents, mattresses and curtains.

Symptoms and who is at risk: stuffy nose, cough, stinging eyes and itchy rashes; asthma and allergies can flare. Young children, older adults and people with lung disease should avoid heavily mouldy rooms.

Prevention: ventilate, discard mouldy items that cannot be cleaned, wear a mask and gloves while scrubbing and never paint over mould. WHD's product information states it covers fungi in general.

From Knowing the Germs to Reducing Them

These eleven share hiding places: mud, tide marks, dung, containers and materials that stay wet. Surface germs such as Salmonella, rotavirus, enterovirus, influenza, Pseudomonas and mould can be reduced by cleaning followed by surface disinfection, the sequence WHO and CDC recommend: remove mud, wash, dry, then disinfect flood-touched surfaces.

On efficacy, WHD's information lists organisms CHEMGENE HLD4H covers, including Salmonella, hand-foot-mouth virus, influenza H1N1 and H5N1, RSV, norovirus, mycobacteria, bacteria in general and fungi. For other germs here, such as Leptospira, Burkholderia, Campylobacter, rotavirus, Pseudomonas and Stachybotrys, no organism-specific test result is claimed. They belong to the bacteria, virus or fungi groups the product says it covers, and you can ask WHD for test data on any specific organism.

Why Hosing Down Mud Is Not Enough After the Ongkharak Flood

Hosing out mud and waiting for the sun helps, but has limits.

The hosing water often comes from a flooded canal or pond, so it may simply move germs around.

Wooden houses have many gaps where germs and mould spores lodge.

Sunlight reaches only outer surfaces. Under-house spaces, cabinets, under beds and inner rooms stay dark and damp.

Shared spaces such as temple halls, shared toilets and kitchens serve many people a day, so missed germs spread quickly.

Washing with clean water and detergent remains essential, and systematic spraying by trained technicians then makes sure every flood-touched surface receives disinfectant before reuse.

WHD Post-Flood Disinfection Spraying for Homes, Temples and Resorts in Ongkharak

World Health Disinfection (WHD) sprays homes, buildings, religious sites, accommodation and businesses. According to the service information, trained technicians spray and/or ULV-fog (Ultra Low Volume fine mist) with CHEMGENE HLD4H, a medical-grade disinfectant from the UK containing Benzalkonium Chloride and Didecyldimethylammonium Chloride.

The service page lists viruses, bacteria and fungi, including COVID-19, RSV, H1N1, H5N1 and hand-foot-mouth virus, with a stated 99.99% efficacy, and lists approvals or endorsements from the Department of Medical Sciences, Mahidol University, NHS England and EN 14476:2013+A2:2019. The product page states 99.85% against COVID-19 within one minute. The manufacturer describes it as broad-spectrum; no strain count is stated.

WHD's customers include hospitals, schools, malls, airports, offices, airlines, banks and residential buildings. WHD is based in Bang Khae, Bangkok 10160, with no branch in Nakhon Nayok; upcountry jobs are arranged by phone or LINE, and dates depend on the schedule, road access and water levels, so same-day service cannot be promised. The current promotion includes a free CHEMGENE spray bottle and WELLGIENIC wet tissues, and a tax invoice is available.

For strong musty odours in wooden houses or guest rooms, ask about residential ozone disinfection as a complementary service.

Five Steps of Post-Flood Spraying for Wooden Houses, Temple Halls and Guest Rooms

1. Survey: send photos and details by LINE or phone: wooden or concrete building, tide-mark height, floor area and use, such as a shelter hall, kitchen or guest rooms.

2. Mud removal and washing: remove paddy silt, dung and rubbish, discard mattresses, sponges and mouldy items, wash floors, walls and furniture with clean water and detergent, and let them dry. Spraying always comes after this.

3. Zoning and preparation: technicians divide the site into zones, food, utensils, personal items and sacred objects are put away, and residents, monks, guests and pets leave the zone being sprayed.

4. Spraying: technicians spray and/or ULV-fog CHEMGENE HLD4H across flood-touched surfaces, wood joints, pillars, walls up to the tide mark, bathrooms, kitchens, rails and high-touch points.

5. Re-entry: according to the service information, wait about 30 minutes before normal use. Follow the technicians' re-entry time, ventilate and wipe food-contact surfaces with clean water as advised.

10 Reasons Ongkharak Homes, Temples and Resorts Should Disinfect After the Flood

1. Water crossed fields and animal pens, carrying dung and urine indoors.
2. Dam-release water stood for a long time, soaking materials deeply.
3. Temple halls and kitchens serve many people. See the spraying service
4. Children who stayed in shelters face rotavirus and hand, foot and mouth disease.
5. Older adults and people with diabetes face serious wound and soil infections.
6. Wooden houses have many gaps that ULV fogging reaches better than wiping.
7. A medical-grade disinfectant covering viruses, bacteria and fungi per product information.
8. Resorts need confidence before welcoming guests. Ask about accommodation
9. About 30 minutes before re-entry per the service information.
10. Trained technicians plan zones for temples, homes and guest rooms. Book a visit

Before and After: A Wooden House Beside the Fields

Example Case: Uncle Som's House and the Temple Hall

An illustrative example to explain the process, not a real customer review.

After the water dropped, the family took the grandson to the community hospital for his fever and mouth sores, Uncle Som had his calf pain checked and Aunt Daeng had her foot wound seen. Relatives removed silt and soaked mattresses, washed floors and pillars and let the wood dry. Then they sent photos to WHD by LINE.

On the day, technicians zoned the under-house area, upper floor, kitchen and bathroom while the family stayed with relatives. After the stated waiting time they returned, opened the windows, cleaned and refilled the water jars and wiped kitchen counters before cooking.

Recovery Checklist for Homes and Buildings in Ongkharak

Before spraying

• Check electrical safety and the structure of wooden houses before moving back.
• Wear boots, gloves and a mask when moving mud and dung, especially with diabetes.
• Discard flood-touched food, rice and condiments.
• Remove silt, wash floors, pillars and walls to the tide mark and dry as fast as possible.
• Remove mattresses, sponges, books and mouldy materials.

During and after spraying

• Everyone, including children, older adults and pets, leaves the zone being sprayed.
• Return at the time technicians give and ventilate.
• Clean and disinfect water jars before refilling; drink boiled or bottled water.
• Community kitchens should serve freshly cooked food quickly and wash equipment every batch.
• Watch for fever, calf pain, bloody diarrhoea, non-healing wounds or children's mouth sores, and see a doctor promptly.

FAQ: Post-Flood Disinfection in Ongkharak, Nakhon Nayok

Q: Only the space under our raised house flooded. Do we need spraying?
A: That space collects the most silt and dung and is often used for sitting, storage or animals. Remove silt, wash and disinfect before normal use.

Q: Can a temple hall used as a shelter be sprayed?
A: Yes. Give its size and a time when no one is using it so technicians can zone it and everyone can leave during spraying.

Q: Does spraying prevent melioidosis?
A: The main protection is avoiding direct mud contact, wearing boots and gloves and covering wounds. Spraying only reduces surface germs after mud removal. See a doctor for prolonged fever or non-healing wounds.

Q: Does WHD serve Ongkharak?
A: WHD is based in Bang Khae, Bangkok, with no Nakhon Nayok branch. Book upcountry service on 065-556-6294 or LINE @whd268; dates depend on the schedule and road access.

Ongkharak Homes, Temples and Resorts Can Be Safe Again: We Prevent and Eliminate Post-Flood Germs for You

River-flood germs come in many kinds: bacteria, viruses and fungi. Once you have cleared the mud, let the WHD team spray CHEMGENE HLD4H, a broad-spectrum disinfectant according to the product information, to help prevent and eliminate germs on surfaces before children and elders come home or halls and guest rooms reopen.

Book Post-Flood Disinfection Now

Call 065-556-6294  |  LINE @whd268

World Health Disinfection, Bang Khae, Bangkok 10160.

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
• Daily News, Nakhon Nayok flood, Khun Dan Prakan Chon Dam release and six relief kitchens (5 Oct 2026): https://www.dailynews.co.th/news/6250170/
• Government Public Relations Department, DDPM flood summary (as of 06:00, 7 Oct 2026): 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
• Thai Department of Disease Control: https://ddc.moph.go.th/