A typical scenario (an illustrative example, not a verified customer review)

Auntie Daeng and her twelve rental rooms at the end of Soi Khlong Luang 50

Auntie Daeng owns a single-storey row of twelve rental rooms at the end of the soi. Most tenants are factory workers who ride motorcycles to work before dawn, plus a few students. The rooms were built long ago, and over the years the road has been raised bit by bit, so the room floors now sit below the street. Heavy rain always pooled outside the doors before seeping into the drains. This time it was not only rain. Water from Khlong Rangsit that had spilled onto the road ran downhill to the lowest point of the soi, which happened to be the front of her rooms.

At five in the morning the first tenant wheeled his motorcycle out and got less than halfway to the mouth of the soi before the engine died. Several others followed with the same result. Some tenants took the day off; others waded out to catch transport on the main road. Auntie Daeng ran to cut the breakers for the whole row as water reached socket height in the end room.

The water stayed for days. When it finally dropped enough to walk through, every room had a thin grey-black film of mud on the floor. Three tenants' mattresses were soaked, particle-board wardrobes had swollen, and a smell of damp mixed with stagnant water rolled out whenever a door opened. Two tenants told her they would leave if the smell did not go, and another developed an itchy rash on his legs. Auntie Daeng now had to work out how to make the rooms safe and liveable again and keep her tenants.

Where Soi Khlong Song and Soi Khlong Luang 50 flooded

This section uses news reports only. The water situation can change by the hour, so follow notices from Khlong Luang district, the local administration and Pathum Thani province as well.

• Naewna, 28 September 2026, 08:00: water in Khlong Rangsit exceeded the critical level and overflowed onto the road around Soi Khlong Song and Soi Khlong Luang 50 in Khlong Song subdistrict, Khlong Luang district.
• The sois are basin-shaped, so water pooled deep, and many motorcycles that tried to pass stalled.
• The report said the volume of water was higher than the previous day.
• Nationally, the DDPM reported on 2 October 2026 flooding in 31 provinces plus Bangkok, with 1,245,581 households and 3,535,206 people affected. The cited report gives no depth figures or household counts for these two sois, so this article adds none.

A basin soi in Khlong Luang: why the water arrives fast and leaves slowly

"Like the bottom of a wok" describes the soi exactly. The edges and the main road are high; the middle or end of the soi is low, so water from every direction collects there. Khlong Luang is flat, low-lying land crossed by numbered side canals branching off Khlong Rangsit. Main roads tend to be raised as the area develops, while older sois and older houses stay at their original level. When the canal overflows, that difference in height becomes a problem immediately.

The water has nowhere to go on its own

In a basin soi, water depends on drains and pumps. While the canal is higher than the drain outlets, drainage almost stops, so houses sit in water for days, unlike a sloping road where water passes through and moves on.

Still water is what germs like

Standing water that is warm and full of organic matter from the canal, rubbish and drains is ideal for bacteria. Oxygen in the water falls, and anaerobic decay produces rotten and sulphurous smells. The longer it stands, the deeper the smell soaks into walls and floors.

Walls wick water above the waterline

The brick and plaster in older rental rooms and townhouses are porous. After days in water, moisture climbs above the visible waterline, sometimes by tens of centimetres. The tide mark on the wall does not show how far the damp really goes.

Stalled motorcycles mean wading

When a motorcycle dies, its rider has to push it through the water or wade out to the main road. Long contact with standing water, especially with a cut on the foot or shin, is how Leptospira and skin bacteria enter the body.

A germ map of a home after standing water: water, surfaces and air

A simple way to understand post-flood risk is to group germs by where they live, because each place needs different handling. Guidance from the WHO, the US CDC and Thailand's Department of Disease Control agrees that floodwater can carry several groups of organisms.

Layer one: germs in standing water and mud

Leptospira, the cause of leptospirosis, lives in standing water and mud contaminated with animal urine. A basin soi with long-standing water and rats escaping the flood near homes calls for extra care. Typical signs are sudden high fever, headache, calf pain and red eyes, within about two to three weeks of wading.

E. coli and Salmonella come with sewage-contaminated water. Septic tanks and wastewater pipes in a flooded soi can overflow and release waste into the water. These bacteria cause diarrhoea, abdominal pain, nausea and fever.

Layer two: germs on surfaces after the water drops

When the water recedes, germs stay in the thin mud film on floors, lower walls, bed legs, food cupboards, plates, bowls and children's toys. Norovirus and rotavirus survive on surfaces long enough to pass from hand to mouth, causing vomiting and diarrhoea. In rental buildings where tenants share bathrooms or washing areas, spread is much faster.

Layer three: germs in the air

Mold can start growing within about 24-48 hours of materials getting wet. In a rental room with one small window and no rear vent, damp lingers and mold spreads from walls to mattresses, wardrobes and the clothes inside them. Airborne spores make allergies and asthma worse.

Respiratory viruses such as RSV and influenza spread more easily when people crowd into closed, damp rooms. During a flood, tenants from several rooms may share whichever room is still dry, raising the chance of infection.

Musty and stagnant-water odours come from compounds released by decaying organic matter and microbial growth. They soak into plaster, wood, fabric and mattresses and keep coming back even after the floor looks clean.

People who need extra care

• Babies and toddlers, who crawl on the floor and dehydrate quickly with diarrhoea.
• Older adults living on the ground floor of townhouses who find stairs difficult.
• Pregnant women, who should avoid wading and scrubbing mold.
• People with chronic illness such as diabetes, whose foot wounds heal slowly and infect easily.
• Shift workers who wade out to work every day and get too little rest.

Rental rooms and dormitories in Soi Khlong Luang 50: landlords and tenants face different problems

Khlong Song subdistrict, and Khlong Luang district generally, has a large stock of rental rooms, apartments and dormitories housing factory workers, service workers and students. Flooding in a soi full of rentals has dimensions a single family home does not.

For landlords, the damage is not just repair costs. Rooms that smell musty or show mold are hard to re-let, existing tenants may leave, and word travels fast among co-workers. Landlords who restore rooms quickly and thoroughly have an advantage in the post-flood rental market.

For tenants, personal belongings such as mattresses, clothes and appliances are often lost with no insurance. Many tenants need to move back in as fast as possible because they have nowhere else to go, so they sleep in rooms that are still damp and smelly, which is a health risk.

Shared areas such as the walkway, motorcycle parking, shared bathrooms and washing areas are often overlooked, yet everyone uses them, and they are a key route for passing germs around.

Rental recovery works best when landlord and tenants agree a joint plan: a day when every room clears out damaged items, a shared washing day, a drying and ventilation period, and a date when everyone leaves the building so the whole row can be treated with ozone in one round.

Common mistakes after standing water drains from a basin soi

Moving back in the moment the water clears the doorstep. A dry floor surface does not mean a dry room. Walls and floors still hold water, and sleeping in a very damp room, especially with a baby, raises respiratory and skin risks.

Keeping a soaked mattress out of thrift. Foam and fibre absorb soi water deep inside. Sun dries the outside, but the core stays wet and becomes a permanent source of mold and odour.

Using strong bleach in a sealed room. Besides working poorly on muddy surfaces, the fumes in a small, unventilated room irritate the eyes and airways. Never mix it with acid- or ammonia-based bathroom cleaners.

Burning mosquito coils or incense to cover the smell. Smoke in a stuffy room makes the air worse, and the stagnant smell returns once the smoke clears.

Repainting to make rooms look ready to let. Fresh paint on a damp wall only hides the problem. Within weeks it blisters and black spots appear, the new tenant has the same issue, and trust suffers more than before.

Trying to restart a flooded motorcycle. It is outside the house, but it happens a lot in this soi. A bike that stalled because water got in should be checked by a mechanic before anyone tries to start it again.

WHD ozone service for rooms and homes in Khlong Song

After the mud is out, the room washed and dried, what remains is invisible: germs in the air, germs in crevices a cloth cannot reach, and odour molecules embedded in materials. That is the job of ozone (O3), a strongly oxidising gas. Released into a closed, empty room, it spreads everywhere, breaks down the structures of viruses, bacteria and mold, breaks apart musty and stagnant-water odour molecules, and then reverts to oxygen (O2), leaving no chemical residue on new mattresses, clothes or dishes.

According to test results certified for the company by the Department of Medical Sciences and Intertek (UK), World Health Disinfection's ozone treatment eliminates viruses, bacteria and mold by 99.99%. Details of the equipment are on the ozone machine page.

How the job runs for a row of rentals or a townhouse

1. Talk it through by phone or LINE. Number of rooms, approximate sizes, how high the water came and where the smell is strongest.
2. Divide into zones. One rental room, or several adjoining ones, may count as a zone; a townhouse might be ground floor, upper floor and bathrooms.
3. Empty the rooms. Tenants and families, pets and plants out of the building; all doors and windows closed.
4. Ozone cycle. Ozone fills the room and is given contact time, typically about 30 minutes per zone.
5. Rest and ventilate. Ozone reverts to oxygen, then the rooms are aired before anyone returns.

Remember: ozone is used only in an empty, sealed room with no people, pets or plants inside. Re-enter only after the rest and ventilation period. Ozone does not replace washing, drying or seeing a doctor.

10 reasons rooms and homes in Soi Khlong Song should be ozone-treated after standing water

1. The water stood for days. The longer the soak, the deeper germs and odour go, so disinfection after cleaning matters more than for a home the water passed in a few hours.
2. Rental rooms are small and stuffy. Ozone gas reaches every corner of rooms with few windows.
3. Faster re-letting. Rooms without a musty smell help keep current tenants and attract new ones. See the residential ozone service.
4. Tackles stagnant-water odour at the source by breaking down odour molecules rather than covering them.
5. Reduces germs in shared areas. Walkways, shared bathrooms and washing areas can be done in the same round.
6. No residue. Ozone reverts to oxygen, so after ventilation it is safe around new mattresses and children's things.
7. Backed by testing: 99.99% according to test results certified for the company by the Department of Medical Sciences and Intertek.
8. About 30 minutes per zone, so tenants can usually move back the same day once ventilation is complete.
9. Helps against returning mold when done after rooms are dry, by reducing spores left in the air and corners. Ask the team.
10. Better value across several rooms. Jobs of 15,000 baht or more include a free medical-grade disinfectant spray, which suits landlords with multiple rooms. Enquire about details.

Before and after: rental rooms at the bottom of a basin soi

Example case: a two-storey townhouse in Soi Khlong Song and an eight-month-old

An illustrative example of a common situation, not a verified customer review.

Mint and her husband rent a two-storey townhouse in Soi Khlong Song with their eight-month-old daughter and Mint's mother. When Khlong Rangsit water ran down the soi, they got their belongings upstairs in time, but the ground-floor living room and kitchen sat in water for days. On the first day her husband had to push his stalled motorcycle home through the soi, and it was several days before the repair shop returned it.

When the water dropped, the whole family shovelled mud, washed the floor and threw out a fabric sofa that had soaked through. Mint's biggest worry was her daughter, who had just started crawling and puts everything in her mouth. A musty smell was still drifting up the stairwell to the bedrooms. When the baby developed a runny nose, Mint took her to a paediatrician, and then called the WHD team.

The team first asked whether the ground-floor walls were dry, advised several more days of open windows and fans pulling air out, and planned three zones: ground floor, stairwell and upstairs bedroom. On the day, the family took the baby and grandmother to stay with relatives, and the house was closed and empty throughout. After the rest and ventilation period, Mint said the musty smell that had worried her had dropped to almost nothing, and she felt comfortable letting her daughter crawl on the freshly wiped floor. Seeing a doctor, drying the house and ozone treatment worked together.

Recovery timeline for rentals and homes in Soi Khlong Luang 50 and Soi Khlong Song

While water still stands in the soi

• Cut power to rooms where water reaches socket height; never plug or unplug while standing in water.
• Do not ride through deep water, and if your bike stalls, do not keep trying to restart it.
• If you must wade, wear boots, cover wounds and wash with clean water as soon as you are out.
• Keep regular medicines, documents and baby supplies up high.

Days one and two after the water drops

• Landlords and tenants photograph damage in each room as a record.
• Have an electrician check the system before switching breakers back on.
• Remove soaked mattresses, futons and swollen particle-board furniture.
• Shovel mud and wash floors, lower walls, bathrooms and the drain outside each room.
• Throw away food and drinks that touched the water.

Day three onward

• Open doors and windows, run fans to pull air out, and use a dehumidifier if available.
• Check whether walls above the tide mark still feel cold and damp.
• Once dry, book the ozone team and arrange for all tenants to leave the building at the same time.

After ozone

• Return only after the rest and ventilation period the team specifies.
• Wipe food-contact surfaces and children's items with clean water.
• Keep watching everyone's health for at least three weeks. High fever, calf pain, red eyes, persistent diarrhoea or breathing difficulty mean seeing a doctor.

Booking service in Khlong Song, Khlong Luang

World Health Disinfection is based in Bang Khae, Bangkok 10160, with no branch in Pathum Thani. Customers in Soi Khlong Song, Soi Khlong Luang 50 and nearby can call 065-556-6294 or message LINE @whd268 with the number of rooms and the condition of the property. The team confirms travel, coverage and appointment dates case by case. Demand is high after floods, so same-day arrival cannot be guaranteed; it is best to get in touch while you are still washing and drying.

The service covers houses, townhouses, rental rooms, apartments, condominiums, dormitories, offices, factories, schools and hospitals. See also disinfection services and Chemgene disinfectant.

FAQ: ozone after the flood in Soi Khlong Song and Soi Khlong Luang 50

1. The soi has not fully drained yet. Can we do ozone first?

No. Wait until the water is out of the house, then remove mud, wash and dry. Treating while water is still standing or walls are soaked means mold will return because the moisture is still there.

2. Does every tenant have to leave?

Any room being treated must be empty of people, pets and plants. If the whole row is being done, arrange for all tenants to leave at once for safety and so the job finishes in one round.

3. Do we need to empty the rooms of furniture?

Usable furniture can stay, but soaked and damaged items such as mattresses should be thrown out first, and documents and valuables secured. The team will advise based on each room.

4. Will the smell come back after ozone?

If the source remains, such as damp walls, mud in drains or a wet mattress, the smell can return. Deal with the source before treatment.

5. How long does it take?

About 30 minutes per zone, plus preparation and ventilation. The number of zones depends on the number and size of rooms.

6. Does WHD have a branch in Khlong Luang?

No. The team is in Bangkok; contact them by phone or LINE to confirm travel and dates.

7. I pushed my motorcycle through the flood and now have fever and calf pain. What should I do?

See a doctor quickly and mention the floodwater exposure. This could be leptospirosis, which needs treatment. Ozone is not a medical treatment.

Make your rooms in Soi Khlong Song liveable again

Wash, dry, then talk to the WHD team about ozone for rental rooms, townhouses and shared areas.

Ask About Ozone Disinfection

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

Related links and references

• Residential and building ozone disinfection
• Certifications
• Contact us
• Naewna, Khlong Rangsit overflow into Soi Khlong Song and Soi Khlong Luang 50 (28 Sep 2026): naewna.com/n/national-news/84243
• Bangkok Biz News DDPM flood summary: bangkokbiznews.com/news/news-update/1254629
• World Health Organization fact sheets: who.int/news-room/fact-sheets
• CDC floods guidance: cdc.gov/floods

Note: flood locations are cited from news reports at the dates and times stated. The situation changes daily.