A typical scenario (an illustrative example based on common situations, not a review from any specific customer)

A Four-Storey Shophouse with Twelve Tenants

Kate is the only daughter of a family that owns a four-storey shophouse down a soi in Khlong Chan. The ground floor is a laundry her mother has run for almost twenty years, with her mother's bedroom at the back. Her mother is now seventy-one. Floors two to four are divided into twelve small rental rooms, mostly let to students and workers who take the bus into town. That rent supports her mother and repays the renovation they did two years ago.

In late September 2026 the rain fell hard for days. Water in the soi kept rising until it poured into the laundry, flooding the bottom row of washing machines, customers' baskets and her mother's back bedroom. It also flowed into the ground-floor stairwell and corridor that every tenant uses. The ground-floor bathroom drain backed up, and the stench climbed the stairwell to the fourth floor. Several tenants went to stay with friends, and Kate's mother moved into an empty room on the third floor.

Once the water dropped, Kate took three days off work. She shovelled mud out of the shop, rewashed every wet customer item, hosed down the stairs, poured bleach in the bathrooms and propped every door open. A week later a second-floor tenant messaged that her room smelled musty and black spots were appearing on the wall next to the stairwell. Another had two days of diarrhoea. Someone asked whether rent would be reduced this month. Her mother started coughing at night. Kate felt responsible for her mother's health, twelve tenants' safety and the survival of the business all at once.

This is not one building's story. It is a familiar picture in Bueng Kum and Khlong Chan, where one building is often a home, a livelihood and a residence for dozens of other people.

Bueng Kum and Khlong Chan Floods 2026: What the Reports Say

This summary draws on news reports from late September to early October 2026. Figures can change daily; follow the latest announcements from government agencies and district offices.

• From 24 to 27 September 2026, Bangkok had continuous heavy rain, about 300 mm in roughly 48 hours, according to news reports.
• Eastern Bangkok was hit hardest, and reports at the time specifically mentioned Khlong Chan and Bueng Kum.
• On 26 September 2026 the BMA declared all 50 districts a disaster zone.
• Governor Chadchart Sittipunt said the canals were full and drainage would take about two to three days after the rain stopped.
• On 30 September 2026 some roads, such as Si Burapha and Lat Phrao, still had 20 to 40 cm of water, according to news reports.
• According to the DDPM report of 2 October 2026, flooding affected 31 provinces plus Bangkok, with 1,245,581 households and 3,535,206 people affected, due to heavy to very heavy rain together with northern runoff.

Thai media compared the event with the 2011 flood, and one business report cited a Chamber of Commerce estimate of about 12,300 million baht in damage. In neighbourhoods full of shops and rental rooms like these, the losses go beyond belongings to the income lost every day a shop stays shut or a room stays empty.

Why Germs Linger in Bueng Kum and Khlong Chan Buildings

Deep, narrow shophouses. Older shophouses are narrow at the front but very deep. Air only enters from the street side, so the back, often a kitchen, bathroom or bedroom, barely ventilates and stays damp for a long time.

Stairwells that act as chimneys. In buildings divided into rental rooms, the stairwell carries damp air and odours from the ground floor up to every level. Upper-floor tenants who never saw floodwater are still affected.

Shared drains. Dormitories and apartments share waste pipes. When public drains are full, sewage pushes back up into ground-floor toilets and floor drains, bringing germs with it.

Budget finishes. Many rental rooms use gypsum ceilings, lightweight partition walls, vinyl or laminate floors and plywood furniture. These absorb water, swell and host mold easily.

Every Kind of Germ Floodwater Brings into Bueng Kum and Khlong Chan Buildings

WHO, the US CDC and Thailand's Department of Disease Control all warn that floods raise the risk of gut infections, skin disease, leptospirosis and respiratory illness. In crowded buildings these germs can pass from one person to many.

Bacteria from Backed-Up Sewage

When the soi's public drains are full, toilet waste flows back through floor drains and ground-floor toilets. Faecal bacteria such as E. coli, Salmonella and Shigella end up on bathroom floors, corridors, stairs and anything left on the floor. Swallowed via hands or dishes, they cause diarrhoea, stomach pain, vomiting or fever. In dormitories where tenants share bathrooms or sinks, the risk is higher.

Leptospira in Flooded Sois

Areas with markets, restaurants and rubbish points have plenty of rats. Leptospira from rat urine mixes into floodwater and mud and enters through cuts or soaked skin. Tenants who wade to work every day are at risk. Anyone who develops sudden high fever, headache and severe calf pain within one to two weeks of wading must see a doctor immediately and mention the floodwater.

Viruses in Shared Spaces

Stair rails, door handles, water-dispenser buttons, coin-operated washing machines and mailboxes are touched by every tenant. Diarrhoea viruses such as norovirus spread easily through these points and survive on surfaces for days. During the flood, tenants doubled up in single rooms, making respiratory viruses easier to pass on as well.

Mold in Ceilings, Partition Walls and Fabric

WHO and CDC advise cleaning and drying within 24 to 48 hours to limit mold, which is hard when a soi stays flooded for days. Mold tends to appear on lower walls, walls beside the stairwell, gypsum ceilings beneath upstairs bathrooms, behind plywood wardrobes, under mattresses and in piles of damp laundry. For a laundry or fabric shop, wet textiles are a perfect breeding ground. Spores cause allergies, sneezing, congestion and coughing and can trigger asthma.

Musty and Sewer Smells Throughout the Building

Where a stairwell links every floor, mold mustiness and sewer smells do not stay downstairs. They reach every room. The smell means the source is still there, and it is the first thing a prospective tenant notices.

Who Is Most at Risk

• Older people living in back rooms on the ground floor
• Young children in tenant or owner families
• Pregnant women who walk through corridors that flooded
• People with chronic illness or allergies
• Workers who wade daily and owners who clean their own premises

The Impact on Owners, Shopkeepers and Tenants

The Health of Dozens Under One Roof

In a shophouse split into rental rooms, one person with diarrhoea or a cough worries the whole building. Tenants start asking whether it is safe, and the owner has to answer.

Income Lost Every Day

Each day the ground-floor shop stays shut is a day's income gone. A tenant who moves out or asks for a discount affects the whole month. The slower the recovery, the more the losses pile up.

Time Pulled in Every Direction

Most owners also have a job. Cleaning, caring for an elderly parent, answering tenants and talking to tradespeople all happen at once. Nobody has time for trial and error.

Reputation of the Building and the Shop

Reviews in online room-hunting groups and word of mouth among regulars matter. A musty room with mold stains stays empty longer, and customers who feel a laundry or restaurant is unclean may not return.

Families Carrying Both Home and Business

When home and livelihood are the same building, flood stress never switches off. Knowing what to do first helps the family find its footing again.

What Owners Usually Do, and Why It Is Not Enough

• Cleaning only the flooded floor. It deals with the mud but forgets that damp air and odour have already climbed the stairwell to every level.
• Pouring bleach in the bathrooms. Fine for surfaces, but it does not fix backed-up pipes or reach the air or the ceiling above. Never mix it with other toilet cleaners.
• Spraying fragrance in shared corridors. Tenants feel better briefly, but mold and bacteria remain.
• Repainting rooms straight away to get them back on the market. If walls are still damp, paint blisters and mold returns within months.
• Running the air conditioner to dry the room. If the unit was exposed to high humidity or smells musty, it can spread mold. Clean it first.
• Letting tenants back in the moment the water drops to protect income. If germs remain, health problems and complaints follow.

What is missing is a step that treats the air and hidden corners of each closable room, room by room and floor by floor, after cleaning and drying.

WHD Ozone Disinfection for Shophouses and Dormitories in Bueng Kum and Khlong Chan

World Health Disinfection (WHD) is based in Bang Khae, Bangkok 10160, and has no branch in Bueng Kum or Khlong Chan. Our team can plan service in this area, with the date, travel and scope confirmed first by phone on 065-556-6294 or LINE @whd268. Demand after the flood is very high, so we cannot promise same-day arrival.

How Ozone Works

Ozone (O3) is a strongly oxidising gas. Released in a sealed room, it fills the whole space, including the air, behind cabinets, under beds and corners cloths cannot reach. It breaks down the cell structures of viruses, bacteria and mold, splits odour molecules at the source, then reverts to oxygen (O2) with no chemical residue. According to testing certified by the company with Thailand's Department of Medical Sciences and Intertek (UK), ozone treatment eliminates viruses, bacteria and mold by 99.99%. See the certification documents.

Safety Rules for Tenanted Buildings

Every treated room must be empty and closed. People, pets and plants leave and return only after the rest and ventilation period set by the team. In a tenanted building, the owner must give advance notice, ask tenants to leave the rooms and floors being treated, and post no-entry signs on stairs or corridors during the work. The team can sequence treatment floor by floor so tenants always have a safe place to wait.

Ozone is a step after mud removal, washing and drying. It does not replace cleaning, fixing backed-up drains, replacing swollen materials or medical care. Anyone with fever, diarrhoea or calf pain after wading must see a doctor.

How We Work in Shophouses and Dormitories

1. Send building details on LINE: floors, room count, which floors flooded, and photos of mold or odour hotspots.
2. Plan the sequence, usually starting with the ground floor and stairwell, then the affected rental rooms, with times for tenants to step out.
3. Confirm date and route, checking that the soi has drained and vehicles can reach you.
4. Prepare: people, pets, plants, food and medicine out; cabinets and drawers opened.
5. Treat zone by zone, typically about 30 minutes per zone.
6. Rest and ventilate before tenants return.
7. Handover with advice on repairs and monitoring humidity.

Ozone jobs of 15,000 baht or more include a free medical-grade disinfectant spray, handy for wiping stair rails and shared surfaces afterwards. Details on the ozone disinfection service page.

10 Reasons Bueng Kum and Khlong Chan Buildings Should Be Ozone-Treated

1. It deals with odour rising up the stairwell, which affects tenants on every floor.
2. It reaches deep back rooms with poor airflow and lingering damp.
3. No chemical residue, so tenants return after ventilation without a harsh cleaning smell.
4. It reduces germs in the air of rental rooms, including invisible mold spores.
5. It cuts sewer and musty smells at the source rather than masking them.
6. It is backed by testing: 99.99% according to testing certified by the company with the Department of Medical Sciences and Intertek.
7. Room by room, floor by floor, about 30 minutes per zone, without emptying the whole building at once.
8. An elderly parent's back room is ready first. Ozone-treat it before they move back.
9. You can tell tenants honestly that the building was cleaned, dried and disinfected. See the residential and building ozone service.
10. A final step before repainting rental rooms, reducing repeat work. Request an ozone quotation.

Before and After Ozone in a Khlong Chan Shophouse

Note: results depend on the building, remaining moisture and repair of pipes or damaged materials. Swollen gypsum ceilings or partition walls should be replaced.

Example Case: A Noodle Shop in a Nawamin Townhouse, Bueng Kum

(An example case to show how the work is done, not a review from any real customer)

Oat and his wife run a noodle shop on the ground floor of a three-storey townhouse in the Nawamin area of Bueng Kum. The family, including their two-year-old daughter, lives upstairs. In late September water entered the shop and it stayed shut for several days. The chest freezer, the wooden cabinets under the counter and the tables and chairs sat in water, and the floor drain in the back kitchen pushed sewage back up.

When the water receded, they threw out all ingredients and dry goods that had been touched by water, washed the kitchen, scrubbed the floors, removed the swollen under-counter cabinets, called a plumber to clear the drains and left the shop open to the air for several days. Then they contacted WHD on LINE. The team suggested treating the ground floor in two zones, the shop front and the back kitchen, plus the upstairs bedroom where their daughter sleeps, because the family said the smell had drifted up.

On the day, the team confirmed timing in advance. The family took their daughter and their cat to a relative's home for half a day and packed food, seasonings and utensils in sealed boxes outside the area. After the rest and ventilation period, Oat said the drain smell that had hung in the kitchen for a week had faded considerably. The family then washed utensils and wiped food-contact surfaces again following the shop's normal routine, and reopened with more confidence.

The lesson: for food businesses, ozone is one recovery step among several. Contaminated food must be discarded, food-contact surfaces cleaned and sanitised to standard, and the drains properly repaired.

Recovery Checklist for Shophouses and Dormitories in Bueng Kum and Khlong Chan

Safety First

• Switch off ground-floor power before entering; have an electrician check wiring, the distribution board and any submerged machines.
• Wear boots, gloves and a mask and cover any wounds before cleaning.
• Ask tenants not to use ground-floor bathrooms until a plumber has checked the drains.

Before Calling the Ozone Team

• Remove mud; wash floors, lower walls, stairs and shared corridors with clean water and detergent.
• Have backed-up drains cleared and checked.
• Discard mattresses, carpets, fabrics and swollen ceiling or partition boards; photograph them first.
• Ventilate, and run a dehumidifier in back rooms if you have one.
• Wipe rails, handles, buttons and shared surfaces with a disinfectant such as Chemgene, following the label.
• Clean air conditioners in rooms that were very humid or smell musty.

On Ozone Day

• Notify tenants in advance; ask them to leave the rooms and floors being treated; post no-entry signs.
• Move people, pets, plants, food and medicine out of each zone.
• Do not re-enter before the rest and ventilation period ends.

After Ozone

• Watch stairwell walls, ceilings under bathrooms and back rooms for several weeks.
• Repaint rental rooms only once walls are fully dry.
• Anyone with fever, calf pain, ongoing diarrhoea or a lasting cough should see a doctor and mention flood exposure.

FAQ: Ozone Disinfection in Bueng Kum and Khlong Chan

Does WHD have a branch near Bueng Kum or Khlong Chan?

No. We are based in Bang Khae, Bangkok. The team can plan visits, with date and travel confirmed first by phone on 065-556-6294 or LINE @whd268.

Can tenants on other floors stay in the building during treatment?

Treated rooms and zones must be empty and closed. Tenants on untreated floors may be able to stay according to the team's plan, but connections to the treated zone must be closed and nobody may enter it until the rest and ventilation period ends.

Will ozone fix backed-up drains?

No. A plumber must fix them. Ozone deals with germs and odour remaining in rooms after cleaning and repair.

Can a ground-floor restaurant be treated?

Yes, once food, ingredients and utensils are removed or sealed. Afterwards, food-contact surfaces still need cleaning following the shop's normal routine.

How long for a four-storey building?

Typically about 30 minutes per zone, plus preparation and ventilation. The number of zones depends on rooms and floors; the team gives a total time in advance.

Do we need to repaint afterwards?

If walls are stained or blistered, wait until they are fully dry, then repaint. Treating before repainting reduces the chance of mold returning.

Make Your Bueng Kum or Khlong Chan Building Liveable Again

Cleaned and dried, but the smell still travels through the building, or tenants are still worried about germs? Let WHD plan ozone disinfection room by room and floor by floor.

See the Ozone Disinfection Service and Get a Quote

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

Related Links

• Residential and building ozone disinfection
• Ozone removal of chemical odours, for paint smells after renovating rooms
• Chemgene medical-grade disinfectant
• Contact us

References

• Bangkokbiznews: DDPM flood situation report
• Thai PBS: 2026 flood situation
• Al Jazeera: Disaster zone declared across Bangkok
• CDC: Floods
• WHO fact sheets