What Happened in Nakhon Nayok Town: The Reported Case

This section summarises what news outlets reported. We have not added any numbers, names or quotes beyond what was published. Flood conditions change daily, so always check the latest announcements from local authorities as well.

• Water level in town: According to a Thairath headline, water in Nakhon Nayok town remained at around 40–50 cm, while the outer areas had started to recede.
• Scale of impact: According to Thai PBS on 30 September 2026, Nakhon Nayok had 4 districts, 41 sub-districts and 397 villages affected, a total of 28,028 households.
• Dam management: The same report noted that the Khun Dan Prakan Chon Dam was releasing water, which is something downstream residents need to follow closely.

Main source: Thai PBS (30 Sept 2026), plus the Thairath headline from the same period. These figures reflect the date of reporting and may change as further surveys come in.

Taken together, these three facts make one thing clear. The problem in Nakhon Nayok town was not only that the water arrived. It was that the water stayed. Water at 40–50 cm is deep enough to flood the ground floor of a shophouse or a single-storey home. It covers stock sitting on the floor, the bottom of fridges and washing machines, and in some rooms it reaches low power sockets. When it sits for several days, it leaves behind silt, a musty smell, and germs on every surface it touched.

Why Standing Water in a Town Centre Is More Worrying Than It Looks

Urban flooding is usually different from flooding in open fields. Water moving through streets, markets and closely packed houses picks up a lot along the way. It can carry overflow from drains, from septic tanks and treatment tanks, food waste from shops and restaurants, rubbish, oil and fuel residue from vehicles, and droppings from rats, dogs and cats. When that water sits still for days in hot, humid Thai weather, some bacteria can multiply quickly.

Timing matters too. When the outskirts are drying out but the town centre is still under water, people in town often have to wade in and out of their homes again and again, to get to work, to buy food, or to move belongings upstairs. Every trip through the water means more skin contact with contamination, which is a bigger worry for anyone with cuts on their feet or legs. Children kept indoors may also play in the water before an adult notices.

Then the water finally goes down, and the hardest work starts. Shop owners want to reopen and families want to get back home. That rush leads many people to skip important steps. They hose off the mud, switch on a fan and call it done, without disinfecting the surfaces that hands and food will touch again. That gap is how illness spreads after the water has gone.

Example Case: A Two-Unit Shophouse in Central Nakhon Nayok

Note: The following is an illustrative example case built from situations commonly seen in flooded homes. It does not describe a real person or a real interview from the news.

Imagine "Jaew", who runs a small grocery store from a two-unit shophouse in the middle of town. The ground floor is the shop and the family lives upstairs, including her mother, who is in her seventies, and her four-year-old niece. As the water came into town, Jaew managed to carry some stock upstairs. But the chest freezer, the steel shelving, the rice bin and some cases of drinking water stayed below, sitting in water almost half a metre deep.

While the water stood for days, the family waded down to check the shop every morning. A sewer smell started to drift up the stairs. Her mother complained of dizziness and lost her appetite. The niece liked to sit on the bottom step, which was under water. Everyone waited for the water to drop. When it finally did, the ground floor was covered in grey-brown mud, the walls had a clear tide line, black spots of mold had started in the corners, and the freezer smelled rotten.

Jaew's questions were simple. When can I reopen? What do I clean first? Which product should I use, with an elderly mother and a small child in the house, and new stock that has to be safe for customers? These are the same questions thousands of households in Nakhon Nayok are now asking, and they are why we wrote this guide.

Germs That Typically Follow Standing Floodwater in Nakhon Nayok Town

The World Health Organization (WHO), the US Centers for Disease Control and Prevention (CDC) and Thailand's Department of Disease Control all warn that floodwater carries several groups of germs into homes. These are the main ones to know.

1. Sewage bacteria: E. coli and Salmonella

When town drains and septic tanks flood, faecal material mixes into the water. Bacteria such as E. coli and Salmonella can then be left behind on floors, walls, counters, kitchenware and children's toys. If hands touch these surfaces and then touch food or mouths, the result can be diarrhoea, stomach cramps, nausea, vomiting or fever. In food shops and grocery stores the risk spreads to customers too, unless the premises are properly disinfected before reopening.

2. Leptospirosis risk

Leptospira bacteria live in the urine of rodents and some other animals. When a town where rats live in drains and markets floods, the bacteria can end up in the water and mud. They can enter the body through cuts, scrapes, or the eyes, nose and mouth, especially after long periods in the water. Thailand's Department of Disease Control advises anyone who develops a sudden high fever, headache and muscle pain, particularly in the calves, after wading through floodwater to see a doctor promptly and mention the exposure. This point matters: a disinfectant reduces germs on surfaces, but it is not a treatment. The best protection is wearing boots, avoiding wading if you have a wound, and washing thoroughly straight after contact with floodwater.

3. Viruses: norovirus, rotavirus, RSV, influenza and hand-foot-and-mouth disease

Norovirus and rotavirus are major causes of diarrhoea and vomiting and spread easily through hands and contaminated surfaces. When many people crowd together upstairs or in a shelter, respiratory viruses such as RSV and influenza also spread more easily. Hand-foot-and-mouth disease is common in young children and passes through shared toys and surfaces. A home with a small child, like the niece in our example, needs particular attention to toys, stair rails and door handles.

4. Mold and musty odours

WHO and CDC recommend cleaning and drying within 24–48 hours after floodwater recedes to limit mold growth. But in a town centre where water stood longer than in the outskirts, plaster walls, skirting boards, wooden doors and furniture hold moisture for a long time, giving mold a chance to take hold. Mold spores can trigger allergies, asthma, coughing, sneezing and eye irritation, especially in older people and anyone with existing lung conditions.

Who is most at risk

• Older people, whose immunity is weaker and who may have conditions such as diabetes, high blood pressure or kidney disease
• Young children, who put their hands in their mouths and play on the floor
• Pregnant women and anyone with a weakened immune system
• Market traders and restaurant owners, who handle many surfaces and a lot of food
• Anyone who wades often or has wounds on their feet or legs

The Knock-On Costs: Health, Money, Time and Customer Trust

Health: Diarrhoea or fever after the water goes down means family members take time off to care for each other. For older people and young children symptoms can become serious enough to need hospital care, and travel is difficult during a flood.

Money: Shops in town that were closed for days have already lost income. If they reopen and still smell musty, or mold is visible on the walls, customers may stay away. Repainting or replacing furniture a second time because mold came back adds cost on top of cost.

Time: Trial-and-error cleaning (washing that leaves a smell, wiping that leaves a stain) means doing the same job several times, instead of spending that time getting the business and daily life back on track.

Trust: For restaurants, cafés and shops in Nakhon Nayok town, regular customers are often locals who know the shop flooded. Being able to say "the mud is gone and we've disinfected with a medical-grade product" goes a long way to winning back their confidence.

Why Soap or Bleach Alone Often Falls Short

This is not to say soap or bleach are useless. Washing off mud with clean water and detergent is the first step and must never be skipped, and the CDC gives guidance on using diluted bleach correctly. But in real homes and shops in town, these products have limitations worth knowing.

• Soap and detergent remove dirt, but aren't designed to disinfect: soap lifts grime off and removes some germs with it, but it is not a high-level disinfectant for surfaces contaminated with sewage.
• Bleach corrodes metal: steel shelving, table legs, aluminium doors, stainless steel equipment in kitchens and the metal parts of freezers can rust or stain with repeated strong bleach use.
• Strong smell and irritation: chlorine fumes in a poorly ventilated shophouse can make older people and children cough or sting their eyes and noses. If bleach is accidentally mixed with acidic toilet cleaners or ammonia, dangerous gases can form.
• Weakened by organic dirt: bleach works less well when mud or organic residue remains, and pre-mixed solutions lose strength over time.
• No residual protection: once dry, surfaces are open to recontamination straight away, while people keep coming and going and water may seep back in.
• Hard on some materials: rubber, plastic and fibreglass may fade or become brittle with repeated exposure to harsh chemicals.

These limits are why many people look for a disinfectant designed for healthcare settings, one that covers a wide range of germs, doesn't corrode equipment and is suitable around people when used as directed.

The Solution: CHEMGENE HLD4H Medical-Grade Disinfectant for Nakhon Nayok Homes and Shops

According to the product information, CHEMGENE HLD4H is a medical-grade high-level disinfectant made in England. It is used in hospitals, clinics, laboratories, schools, offices, airports and homes, as well as in elderly-care and childcare settings. Key points from the product information:

• Broad coverage: bacteria, fungi and mold, mycobacteria, Salmonella, and viruses including influenza H1N1, RSV, norovirus, hand-foot-and-mouth virus and SARS-CoV-2.
• Fast action: the product page states it kills within 1 minute, with 99.85% efficacy against COVID-19.
• Residual protection: the product page states residual surface protection of up to 14 days.
• Flexible dilution: 1:30, 1:50, 1:60, 1:100 and up to 1:200, depending on the job and the label directions.
• Non-corrosive: suitable for stainless steel, aluminium, rubber, plastic and fibreglass.
• Biodegradable, and the product page says it is safe for people, pets and medical equipment when used as directed.
• Tests and approvals listed: Mahidol University, NHS England, ISO 9001:2015, ISO 13485, SGS, Intertek, CE, and EN 13727 / EN 14348 / EN 13624 / EN 14476.

For homes and shops in central Nakhon Nayok, two features matter most. First, it does not corrode metal, which counts in shophouses full of roller shutters, steel shelving, freezers and stainless steel equipment. Second, it lacks the harsh chlorine smell, which suits homes where an elderly parent and small children live upstairs.

How to Use Chemgene HLD4H After the Flood: Wash Off the Mud First, Then Disinfect

The first rule to remember is that every disinfectant works best on a surface that has already been cleaned. Never spray it straight onto mud and expect the job to be done. The recommended steps are:

1. Safety before entry: make sure ground-floor power is off, watch for snakes or other animals that may have sheltered inside, wear rubber gloves, boots and a mask, and open doors and windows for airflow.
2. Remove damaged items: separate porous items that cannot be cleaned, such as mattresses, pillows, thick rugs, paper, cardboard boxes and any food that touched floodwater, and dispose of them as your local authority directs.
3. Shovel and wash: remove as much mud as possible, then wash floors, walls, shelves and furniture with clean water and detergent. Scrub corners and crevices, working from top to bottom and from the inside out.
4. Dilute per label: choose the Chemgene HLD4H dilution recommended on the label for the task. The product supports ratios from 1:30 to 1:200. Use clean containers and spray bottles, and label the diluted solution.
5. Spray or wipe thoroughly: treat floors, the flooded part of walls, shelving, counters, freezers, door handles, stair rails, switches (once power is safe) and washable children's toys.
6. Allow the label contact time: let the surface stay wet for the contact time stated on the label. Don't rush to wipe it off.
7. Ventilate and dry: open windows and use fans to dry everything, breaking the moisture cycle that mold needs.
8. Repeat on high-touch points: in the first week after reopening or moving back in, disinfect frequently touched surfaces at intervals as advised on the label.

Do not mix Chemgene HLD4H with other chemicals, store it out of children's reach, and read the label every time. For dilution advice on specific jobs, such as a food business or the room of a bedridden patient, ask the team directly.

10 Reasons Chemgene HLD4H Suits Flood Recovery in Nakhon Nayok Town

1. It is a medical-grade high-level disinfectant according to the product information, made in England and used in hospitals and clinics.
2. It covers bacteria, viruses and fungi, the three main groups that follow standing water in town. See the organisms listed on the product page.
3. It lists norovirus, RSV and hand-foot-and-mouth virus, directly relevant to homes with small children and older people.
4. It acts within 1 minute, as stated on the product page, helping shops that need to reopen quickly.
5. Residual surface protection of up to 14 days, per the product information, useful while people are still coming and going and humidity stays high.
6. Non-corrosive to stainless steel and aluminium, protecting shelving, shutters and expensive shop equipment.
7. Safe on rubber, plastic and fibreglass, such as buckets, plastic crates, boots and children's toys.
8. Dilutes up to 1:200, so one bottle covers a large area, economical for multi-unit shophouses. Order or ask about pack sizes.
9. Biodegradable, easing the environmental load on a community that has just dried out.
10. Backed by tests and approvals from several institutions, including Mahidol University, NHS England, SGS, Intertek and EN standards, per the product information. View certificates.

Before and After: A Town Shophouse Disinfected the Right Way

Recovery Checklist for Homes, Shophouses and Shops in Nakhon Nayok Town

While the water is still standing

• Follow provincial announcements and news about releases from the Khun Dan Prakan Chon Dam every day.
• Avoid wading unless necessary. If you must, wear boots and wash straight afterwards.
• Keep drinking water, dry food and regular medicines upstairs.
• Prepare supplies in advance: rubber gloves, boots, masks, brooms, scrubbing brushes, detergent, rubbish bags and Chemgene HLD4H disinfectant.

The first day the water drops

• Have an electrician check the wiring before switching on.
• Photograph the damage for assistance claims or insurance.
• Throw out food and medicine that touched floodwater, and any stock whose packaging was not sealed.
• Move waterlogged furniture outside to dry or consider disposing of it.

Cleaning and disinfection

• Wash mud and grime off floors, walls, shelves and roller shutters.
• Disinfect with Chemgene HLD4H at the label dilution and contact time.
• Prioritise sales counters, freezers, ice boxes, chopping boards and kitchenware in food businesses.
• Disinfect bathrooms, sinks and the floor around drains, where dirty water backs up.
• Wash and disinfect children's toys, stair rails, door handles and remote controls.

After reopening and moving back in

• Watch household members for symptoms. Fever, calf pain or severe diarrhoea means seeing a doctor promptly.
• Disinfect high-touch points regularly through the first week.
• Check for new mold on walls and behind cupboards.
• If musty smells or chemical odours from repairs linger, consider an ozone odour and chemical-residue removal service.

FAQ: Disinfecting After the Nakhon Nayok Flood

Q: The water in town hasn't fully gone. Should I start disinfecting now?

A: While water is still standing, focus on safety and personal hygiene: wash hands and feet, and disinfect surfaces on the floors you are still using. Thorough cleaning and disinfection of the ground floor should wait until the water has gone, the power is safe, and the mud can be removed.

Q: Can I spray Chemgene straight onto the mud?

A: No. Wash off mud and grime first, then apply the product to clean surfaces at the label dilution and contact time. Every disinfectant performs best on a clean surface.

Q: Is it suitable for a home with older people and young children?

A: The product information states it is safe for people and pets when used as directed, and it is used in elderly-care and childcare settings. Even so, keep children away from the area while spraying, ventilate well and store the product out of reach.

Q: Can I use it on steel shelving and a stainless steel freezer?

A: Yes. According to the product information, Chemgene HLD4H is non-corrosive to stainless steel, aluminium, rubber, plastic and fibreglass, an advantage over repeated use of strong bleach.

Q: Does Chemgene prevent leptospirosis?

A: A disinfectant reduces germs on cleaned surfaces, but it is not a medicine and cannot prevent infection entering through a wound while you wade. To prevent leptospirosis, wear boots, avoid wading with open wounds and wash straight away. If you get a fever and calf pain after wading, see a doctor promptly.

Q: Does 14-day residual protection mean I don't need to clean again?

A: No. Fourteen days is the maximum surface protection stated in the product information. Heavily used surfaces, or ones that are wiped often, still need routine cleaning and repeat disinfection as appropriate.

Q: I'm in Nakhon Nayok. How do I order or ask questions?

A: Contact World Health Disinfection on 065-556-6294 or LINE @whd268. The team can advise on pack sizes, dilution and delivery options for your area.

Get Ready to Disinfect Your Home or Shop in Nakhon Nayok

Wash away the mud, then finish with a medical-grade disinfectant so your family and customers can use the space again with confidence.

Order CHEMGENE HLD4H Now

Call 065-556-6294 | LINE @whd268 | worldhealthdisinfection@gmail.com

Related Links and References

Internal links:

• CHEMGENE HLD4H medical-grade disinfectant
• Chemgene product range
• Professional disinfection service by WHD

References:

• Thai PBS: Nakhon Nayok flood situation (30 Sept 2026)
• Thairath: headline on water levels in Nakhon Nayok town (late Sept 2026)
• World Health Organization fact sheets
• CDC: Floods and Your Health
• Department of Disease Control, Thailand

Please note: flood figures reflect the date of reporting and change daily. Disinfectants help reduce the risk of infection from surfaces during recovery. They do not prevent flooding and are not medical treatment. Anyone who feels unwell should see a doctor.