Chaeng Watthana Road is one of the main arteries of Pak Kret district in Nonthaburi. Every day it carries office workers, students, people visiting government offices, and residents of the many condominiums and housing estates that line it. On 26 September 2026 it turned into a waterway. According to Daily News, water on Chaeng Watthana Road was nearly 1 metre deep, small vehicles were banned from passing, the Chaeng Watthana and Muang Thong Thani expressway exits were closed, and several cars were submerged.

This article retells what was reported, explains which germs a flood on a major urban road brings into cars, homes and office buildings, identifies who should take extra care, and closes with a step-by-step disinfection plan using CHEMGENE HLD4H, a medical-grade disinfectant. Water levels and official announcements change daily, so please check the latest information before travelling.

What Happened on Chaeng Watthana Road, Pak Kret

In late September 2026, continuous heavy rain across Bangkok and its neighbouring provinces overwhelmed drainage systems in many areas. Chaeng Watthana Road on the Nonthaburi side, which carries heavy traffic every day, was among them. According to the Daily News report of 26 September 2026, the key details were:

• Water level: nearly 1 metre on Chaeng Watthana Road.
• Traffic: small vehicles banned, and the expressway exits to Chaeng Watthana and Muang Thong Thani closed.
• Damage: several cars submerged.
• Relief measure: BTS offered free parking at several stations from 26 September to 2 October 2026, so people could leave their cars somewhere safe and continue by Skytrain.
• Disaster declaration: Nonthaburi province declared disaster zones in Mueang Nonthaburi district and Pak Kret district.

The image of a main road with water close to waist height makes it clear that the problem went far beyond traffic jams. Many cars had to drive through water or were left parked where the flood reached them. People waded to get home or to work. Commercial buildings, shops and ground-level car parks along the road were at risk of taking in water. The BTS free-parking measure also shows that a large number of people switched to public transport at the same time, within a short period.

The fact that Nonthaburi declared disaster zones across both Mueang Nonthaburi and Pak Kret tells us the impact was not limited to one road; it reached wide residential areas. A declaration like this helps agencies bring in resources faster, from water pumps and relief bags to post-flood recovery work.

Source: Daily News (26 September 2026). Water levels, road closures and BTS measures may change with the situation. Check the latest announcements from Nonthaburi province, the Expressway Authority and the rail operator before you travel.

Why Water on a Main Road Is Not Just Rainwater

Many people think of road flooding as rainwater that simply could not drain fast enough. In reality, water standing on a major urban road is a mixture from many sources: rain, backflow from storm drains and building wastewater pipes, overflow from sewage chambers, engine oil and fuel residue from vehicles, litter, dead animals, and urine from the rats that live in the drains. The World Health Organization (WHO) and the US CDC both state that floodwater is often contaminated with sewage and chemicals, so all floodwater should be treated as unclean.

When water like this gets into a car cabin, a building lobby or the ground floor of a home, what remains after it recedes is a thin layer of silt carrying germs and contaminants that are almost invisible to the naked eye. In enclosed spaces such as a car cabin, where air barely circulates, moisture trapped in carpets and seats also speeds up mould growth.

That is why recovery after the Chaeng Watthana flood needs to cover three places: the car, the home or condo, and the workplace. One person may deal with all three in a single day.

Example Case: A Chaeng Watthana Commuter and a Flooded Car (Illustrative Scenario)

Note: this is a typical scenario written to explain common post-flood situations. It is not a real person or a quote from the news.

Oat is an office worker in his early thirties who lives in a condo in Pak Kret and drives to work every day. On the morning of the heavy rain he left his building and found the road outside had become a lake. He reversed and parked in the ground-floor car park instead. By evening the water had reached the car park too, and his car stood in water up to the cabin floor.

Several days after the water receded, the car was towed to a garage to check the electrics and engine. The garage recommended removing the carpets and seats for cleaning and drying. What worried Oat most was the musty smell and a simple question: "The steering wheel, the console and the door handles all sat in drain water. When will they be safe to touch again?" His young niece sits in the back seat almost every weekend.

At the same time, the ground-floor storerooms of his condo and the lobby of the office building where he works had also taken in water. Building management needed to get common areas back into use as quickly as possible without damaging stainless steel, aluminium and rubber door seals. This is the real challenge for many people across Pak Kret.

What Oat needs is not a miracle product but a clear order of work. First, the garage deals with safety: electrics, engine and the removal of soaked carpets. Second, every hard surface is washed until no silt remains. Third, those clean surfaces are disinfected with a product that will not damage plastic or rubber, left for the label contact time, and then dried thoroughly with the doors open. The same three steps apply to his condo storeroom and to the office lobby. When the order is right, each step makes the next one work better, and nobody is left guessing whether the job has been done properly.

Germs That Follow the Chaeng Watthana Flood, and Who Is Most at Risk

Sewage bacteria: E. coli and Salmonella

When storm drains overflow, wastewater carrying faecal bacteria mixes with the water on the road. E. coli and Salmonella are examples of germs that can cause diarrhoea, stomach cramps, vomiting and fever if hands touch contaminated surfaces and then food or the mouth. In a car, the risk areas are the cabin floor, the lower door panels, the seat rails and any storage compartments the water reached.

Leptospirosis

Urban roads have large rat populations living in their drains. When the water rises, Leptospira bacteria from rat urine spread through it. People who wade along Chaeng Watthana to get home or to push a stalled car can be exposed through cuts on their feet or legs. Thailand's Department of Disease Control advises watching for sudden high fever, muscle pain (especially in the calves) and red eyes in the days to weeks after wading. Anyone with these symptoms should see a doctor immediately and mention their exposure to floodwater.

Viruses in crowded spaces: norovirus, rotavirus, RSV, influenza and hand, foot and mouth disease

While roads are closed, many people switch to the Skytrain, vans and buses at the same time, which makes stations and carriages more crowded. It is also the tail end of the rainy season, when respiratory viruses such as RSV and influenza are common. Gastrointestinal viruses like norovirus and rotavirus pass easily via hands and surfaces. For families with small children, hand, foot and mouth disease is another concern, since the virus can survive on toys and child car seats.

Mould in cars and closed rooms

Car cabins, ground-floor storerooms and windowless meeting rooms are ideal for mould, because air does not circulate and moisture lingers. The CDC recommends cleaning and drying as soon as possible, generally within 24 to 48 hours after the water goes down, to limit mould. If left, mould spores cause musty smells and can trigger allergies or asthma.

Groups who need extra care

• People who waded to work or to move their car, especially those with cuts on their feet or legs.
• Young children in car seats or playing on floors that were flooded.
• Older adults and people with chronic illness, whose immunity is lower.
• People with allergies or asthma, who react to mould spores in closed spaces.
• Cleaners, security staff and building maintenance teams who handle mud and wastewater for days.

The Impact on Daily Life in Pak Kret and Mueang Nonthaburi

Getting around. With the Chaeng Watthana and Muang Thong Thani exits closed and small vehicles banned, many commuters had to change plans at short notice. The BTS free-parking measure from 26 September to 2 October 2026, reported by Daily News, let many people park safely and carry on by train, but it also meant busier stations and carriages. Frequent handwashing and avoiding touching your face matter during this period.

Cost. A flooded car needs its electrics and engine checked and may need new carpets or seats. These costs are already high. Using chemicals that corrode plastic or rubber on top of that can spread the damage to parts that were still fine.

Work. Offices, shops and businesses along the road had to close temporarily or run on limited hours. When they reopen, owners and staff alike want confidence that the premises are safe for their health.

Family. Parents of small children worry about cars that sat in water and about ground-floor rooms. Elderly relatives are more likely to fall ill if the home stays damp and mouldy. These worries are why systematic recovery means more than making things look clean on the surface.

Why Plain Water, Soap or Bleach Is Not Enough on Its Own

Washing with clean water and detergent is an essential first step, because it removes mud and grime. But stopping there, or jumping straight to bleach without care, can create these problems:

The safe principle is: remove mud and wash first, then disinfect with a product designed for disinfection, following the label dilution and contact time, and choosing a product that will not damage the materials you want to keep.

CHEMGENE HLD4H: A Medical-Grade Disinfectant Suited to Post-Flood Recovery in Pak Kret

CHEMGENE HLD4H is a medical-grade high-level disinfectant made in England. According to the product information, it is used in hospitals, clinics, laboratories, schools, offices, airports and homes. What makes it particularly relevant to Chaeng Watthana is that it works across a wide range of materials found in cars, condos and office buildings.

Because it does not corrode plastic, rubber or aluminium, Chemgene HLD4H suits cleaned hard surfaces inside a car, such as door panels, the console, handles and rubber trims, as well as building common areas like stainless steel handrails, aluminium doors and car park floors. For specialist materials in a car, such as genuine leather or electronic components, always ask your garage or the car maker first.

A Three-Part Recovery Plan After the Chaeng Watthana Flood: Car, Home and Workplace

Part 1: A car that sat in floodwater

1. Do not start the engine yourself. If water reached the cabin or engine bay, contact your insurer and a garage to check the electrics and engine first.
2. Remove carpets, seats and sound-deadening as the garage advises. Porous materials soaked in dirty water usually need washing and drying, or replacement.
3. Wash all mud off hard surfaces with clean water and detergent until no residue remains.
4. Disinfect with Chemgene HLD4H. Dilute according to the label, then wipe or lightly mist cleaned hard surfaces and leave for the contact time on the label. Avoid spraying directly into sockets, speaker grilles and electronics.
5. Leave the doors open until fully dry, using fans or a dehumidifier, before refitting carpets and seats.
6. Clean and disinfect child car seats. The plastic shell can be cleaned and disinfected; wash fabrics per the maker's instructions, and check with the manufacturer whether a seat is still safe after being submerged.

Part 2: Houses, townhouses and condos

1. Switch off power and have an electrician check any sockets that were under water.
2. Wear gloves, boots and a mask, and cover any cuts.
3. Remove mud and damaged items; wash floors, walls and furniture with clean water and detergent.
4. Dilute Chemgene HLD4H per the label and apply to every hard surface the water reached, plus high-touch points like door handles, switches, stair rails, kitchen counters and bathrooms.
5. Leave for the contact time, then open windows to dry everything as quickly as possible.

Part 3: Offices, shops and common areas

1. Building management checks electrical safety, lifts and pumps before reopening.
2. Wash mud out of lobbies, car parks, storerooms and shared toilets.
3. Disinfect with Chemgene HLD4H at the label dilution in shared areas: lift buttons, handrails, glass doors, reception desks, toilets and eating areas.
4. Set a schedule for wiping high-touch points during recovery, and post signs reminding staff to wash their hands often.
5. For large buildings, ask the team about pack sizes and a usage plan on 065-556-6294.

10 Reasons Pak Kret Residents Choose Chemgene HLD4H After the Water Recedes

1. One product for car, home and office, because, according to the product information, it does not corrode plastic, rubber, aluminium or stainless steel.
2. Medical grade from England, used in hospitals and clinics. See the product information.
3. Covers bacteria, viruses and mould commonly found after floods and in crowded spaces.
4. Fast acting: the product page states it kills within 1 minute, ideal for people who need their car and building back quickly.
5. Up to 14 days of residual surface protection, useful while buildings are busy with people.
6. No harsh chlorine smell, suitable for car cabins and closed rooms.
7. Multiple dilutions from 1:30 to 1:200, cost-effective for large areas like car parks and lobbies.
8. Stated safe for people and pets when used as directed, good for condos with children or pets.
9. Tested by several institutions, including Mahidol University, NHS England, SGS, Intertek and EN standards. Check the certifications.
10. Biodegradable, lowering the environmental burden when rinse water goes down the drain.

Before and After: A Car Cabin and a Building Lobby on Chaeng Watthana

Health Checklist for Anyone Who Waded Through the Chaeng Watthana Flood

• ☐ Wash feet and legs with soap and clean water immediately after wading, and dry well, especially between the toes.
• ☐ Clean and cover any wounds; see a doctor if a wound becomes red, swollen or starts to produce pus.
• ☐ Wash clothes and shoes worn in the water separately.
• ☐ Watch for fever, calf pain, red eyes or diarrhoea in the weeks after wading, and see a doctor and mention your exposure if they appear.
• ☐ Wash hands often after using crowded trains or buses.
• ☐ Never drive through deep water, and check official road-closure updates before setting out.
• ☐ After cleaning, disinfect high-touch points in your car, home and desk according to the product label.

Frequently Asked Questions

How severe was the 2026 flood on Chaeng Watthana Road?
According to Daily News (26 September 2026), water was nearly 1 metre deep, small vehicles were banned, the Chaeng Watthana and Muang Thong Thani expressway exits were closed, several cars were submerged, and Nonthaburi declared disaster zones in Mueang Nonthaburi and Pak Kret districts.

Can Chemgene HLD4H be used inside a car?
Yes, on cleaned hard surfaces such as plastic, rubber and aluminium, which the product information says it does not corrode. Avoid spraying into electronics, and ask your garage about specialist materials such as genuine leather.

Should I wash off mud first or apply Chemgene straight away?
Always remove mud and wash first, then apply Chemgene to the clean surface at the label dilution and contact time.

Which dilution should I use?
The product information lists 1:30 to 1:200. Follow the label and the type of job. If unsure, ask the team on 065-556-6294 or LINE @whd268.

Can large office buildings order in bulk?
Yes. Contact the team about pack sizes, pricing and guidance for common areas.

If I get a fever after wading, will a disinfectant help?
No. Disinfectants are for surfaces only and are not a medical treatment. If you have fever, calf pain or diarrhoea after wading, see a doctor straight away.

Get Your Car, Home and Workplace on Chaeng Watthana Safe Again

Wash the mud away, then disinfect with a medical-grade product that is kind to your materials. Talk to the World Health Disinfection team today.

Order CHEMGENE HLD4H

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

Related Links and References

• Chemgene at World Health Disinfection
• Disinfection services for buildings and offices
• Daily News: Chaeng Watthana flooding, expressway exits closed, cars submerged (26 September 2026)
• World Health Organization
• CDC: Floods
• Department of Disease Control, Thailand

Hashtags

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