A typical scenario (an illustrative example, not an interview with any real tenant or landlord)

Tom works at a factory and has rented a ground-floor room in a small roadside block in Lat Lum Kaeo for several years. His room holds a bed, a plywood wardrobe, a standing fan, a small fridge and a rice cooker. Everything sits on the tiled floor, because the room is too small for shelves. That night the rain did not stop, drumming on the metal roof of the shop next door until he finally fell asleep, still uneasy.

A little after four in the morning, Tom felt cold water on the foot hanging off his bed. When he switched on the light he saw muddy water sliding in under the door. His shoes were floating in the middle of the room and the extension cord on the floor was already underwater. He switched off the breaker, lifted what he could onto the bed and waded outside. Every room on the ground floor was the same. One neighbour stood under the eaves holding a toddler; another was sweeping water out the door, only to watch it flow straight back in.

By the next morning the water had gone down, leaving a thin brown film of mud across the floor. The plywood wardrobe had swollen at the base, the bottom of the mattress was soaked, and the room smelled like a drain mixed with wet earth. The landlord promised to have the drain in front of the building cleared and asked tenants to clean their own rooms. Tom scrubbed the floor with toilet cleaner, ran the fan all day and sprayed air freshener. Three days later the smell was still there, small black spots were appearing low on the wall, and his arms and legs had started to itch after sleeping on the mattress that had been wet.

Tom's story is not unusual. Flooding from blocked drains is often dismissed as "temporary standing water," but for ground-floor rental rooms, shops that keep stock on the floor and homes whose doors sit level with the road, a few hours is enough for germs and moisture to settle into materials.

Where the Flooding Hit on Pathum-Lat Lum Kaeo Road, Moo 6, Khu Bang Luang

According to Siam Rath on 25 September 2026, the area along Pathum-Lat Lum Kaeo Road, Moo 6, Khu Bang Luang subdistrict, Lat Lum Kaeo district, Pathum Thani flooded after heavy rain fell through the night. The reported facts are:

• Water flooded about 30 ground-floor rental rooms.
• Water also entered shops and homes along the road.
• The main cause was roadside drains blocked with soil, sand and stones, so rainwater could not drain in time.

For national context, the Department of Disaster Prevention and Mitigation (DDPM) report published by Thai PBS on 4 October 2026 said flooding was still affecting 27 provinces plus Bangkok, across 154 districts, with 1,171,165 households or 3,262,676 people affected, and warned of renewed heavy rain from 4 to 7 October. These figures change daily, so residents should follow announcements from the district office, local administration and DDPM.

The key point here is that the water did not come from a river overflowing its banks. It came from rain that could not get into the drains. When roadside drains are choked with soil, sand and stones, rainwater runs across the road surface and pours into the lowest buildings first: ground-floor rooms and shopfronts that open straight onto the road. That water carries road sediment, engine oil residue, rubbish and whatever flows back up out of the drain itself. It is not "clean rainwater," as many people assume.

What Water From a Blocked Drain Brings Into Rooms in Lat Lum Kaeo

Tenants and shop owners in Khu Bang Luang often ask the same question: the water came in for one night and went down within a day, so is it really a concern? The answer is that time is not the only factor. What matters more is what the water passed through. Water that backs up from a drain is often contaminated with household waste, roadside soil, animal droppings and rubbish. The germs worth knowing fall into a few main groups.

Bacteria

E. coli lives in human and animal intestines. When it turns up in water, it means the water is contaminated with faeces. Some types cause diarrhoea and stomach cramps and can be serious for young children, older adults and people with weak immunity. It can cling to floor tiles, bed and table legs, and kitchen utensils that were underwater.

Salmonella travels with contaminated water and with food that touched floodwater. It causes food poisoning with fever, diarrhoea and vomiting. Roadside shops selling food or drinks need extra care: fresh and dry goods that got wet should not be sold or eaten.

Leptospira causes leptospirosis, known in Thailand as "rat urine fever." It comes from the urine of rats and other animals mixed into standing water. Blocked drains are prime rat habitat, so when they overflow, the bacteria are easily washed into rooms. It enters the body through cuts, scrapes or skin softened by long soaking. Watch for a sudden high fever, headache and marked pain in the calf muscles within one to two weeks of wading. Anyone with these symptoms should see a doctor promptly and mention the flood exposure.

Viruses

Norovirus and rotavirus are highly contagious gut viruses that cause diarrhoea and vomiting, especially in young children. They survive on surfaces for a fair amount of time. In rental blocks where several families share corridors and washing areas, they can pass from room to room quickly.

RSV and influenza do not arrive in the water itself, but floods are a time when people crowd into small rooms, get exhausted, sleep badly and live in cool, damp air. Those are ideal conditions for respiratory infections, and young children and older adults in damp rental rooms tend to fall ill more often.

Mold and Odours

Mold can start growing within 24 to 48 hours after materials get wet, in line with general WHO and CDC guidance. Lower plaster walls, tile grout, plywood in wardrobes and doors, mattresses, curtains and cardboard boxes of stock are its favourite places. Mold spores float in the air and can trigger allergies and asthma, with coughing, sneezing, a blocked nose, itchy eyes and skin rashes.

Musty and sewer odours come from volatile compounds released by mold and bacteria, mixed with the smell of waste trapped in floor joints and wall bases. The smell is not just a nuisance; it is a sign that something is still growing in the room. For a shop, a musty smell keeps customers from walking in and can cling to fabric goods such as clothes and blankets until they can no longer be sold.

Who Is Most at Risk in Roadside Rooms and Shops in Khu Bang Luang

Many roadside rental rooms in Lat Lum Kaeo house factory workers, day labourers and young families, sometimes with elderly parents living with them. Their risks differ:

• Young children crawl and play on floors and put things in their mouths, so they have the most contact with germs on floors that were underwater, and they dehydrate quickly with diarrhoea.
• Older adults have weaker immunity, may suffer more severe gut or chest infections, and often have other conditions.
• People with chronic illness such as diabetes, kidney or lung disease, or those on immune-suppressing drugs, face a higher chance of serious infection and slow-healing wounds.
• People with allergies or asthma are sensitive to spores and musty air and may flare up after moving back into a damp room.
• Shop owners and staff who carry wet stock, shovel mud and wade repeatedly are more likely to cut their hands and feet.

Anyone with a fever, calf pain, persistent diarrhoea, vomiting, a productive cough, difficulty breathing or a red, swollen wound should see a doctor straight away. Ozone treats germs in the room and in the air. It does not treat people who are already ill.

The Real Costs for Lat Lum Kaeo Tenants, Landlords and Shopkeepers

Health. Tenants who go straight back to sleeping in a damp room often start with small symptoms, a blocked nose, itchy skin or an upset stomach, which can grow into fever or an asthma attack. When several families live side by side in one block, one sick person can mean a whole floor falls ill.

Money. People renting by the day or month rarely have much in reserve. Replacing a mattress, a fan or a fridge while also missing shifts because of illness lands all at once. Shop owners must throw away wet stock, close for days and perhaps repair shelving and display fridges.

Time. Scrubbing room by room, drying items one at a time and waiting for walls to dry takes days. Shift workers have little time to clean thoroughly, so damp and mold get left in places no one can see.

Reputation. For landlords, rooms that smell musty or show mold stains are hard to let. Existing tenants may move out, and new ones notice the smell the moment the door opens. For shops, regulars who used to stop on the way home may switch to another shop if the front still smells like a drain.

Why Familiar Fixes Fall Short in Khu Bang Luang Rental Rooms

Wiping with bleach alone. Correctly diluted bleach can disinfect smooth surfaces, but it does not soak into plaster, plywood or mattresses and does nothing for germs in the air. Using it too strong in a closed room irritates the airways, and it must never be mixed with acidic toilet cleaners or ammonia, which can release dangerous gases.

Running a fan all day. Fans dry surfaces faster, but in a rental room with a single window the air just circulates and spreads mold spores around. If moisture inside the wall is still high, mold keeps growing.

Air freshener or incense. These only mask the smell for a while. When the fragrance fades, the musty odour returns, sometimes worse for the mix.

Painting over mold. This is the most common mistake in rental rooms, because landlords want rooms to look new quickly. Paint on a damp wall bubbles and peels, the mold underneath keeps growing and reappears within weeks.

WHD Ozone Disinfection for Lat Lum Kaeo and Pathum Thani

World Health Disinfection (WHD) provides residential and building ozone disinfection for homes, condos, rental rooms, shops, offices, factories, schools and hospitals. Ozone gas (O3) is a strong oxidiser that breaks down the cell structures of bacteria, viruses and mold, as well as odour molecules. When the job is done, ozone reverts to oxygen (O2), so it leaves no chemical residue on floors, walls or furniture.

Because it is a gas, ozone reaches the whole room: under beds, behind wardrobes, beneath stock shelves and through all of the air, places a cloth or spray cannot reach. According to test results certified for the company by Thailand's Department of Medical Sciences and Intertek (UK), the system eliminates viruses, bacteria and mold by 99.99%. See the certification page for details.

WHD is based in Bang Khae, Bangkok, and has no branch in Pathum Thani. Service in Lat Lum Kaeo and Khu Bang Luang is arranged and travel confirmed by phone at 065-556-6294 or LINE @whd268. The team will ask about the number of rooms, floor area and post-flood condition to plan a suitable date and time; same-day arrival is not promised.

How the Process Works

1. Survey and plan: collect details on each rental room, shop or home, how high the water reached and how dry the walls are.
2. Prepare the space: people, pets and plants leave; doors and windows close; uncovered food is removed; cupboards and drawers are opened so the gas can reach inside.
3. Release ozone: the generator fills the space, about 30 minutes per zone depending on size and condition.
4. Contact time: the gas is left to act on germs and odour molecules.
5. Rest and ventilate: ozone breaks down into oxygen, then the space is aired before anyone returns.

Key rule: ozone treatment is done only in an empty, closed space. No people, pets or plants may be inside during treatment, and re-entry happens only after the rest and ventilation period. In a rental block, the team plans zone by zone so other tenants are not affected.

10 Reasons Rental Rooms and Shops on Pathum-Lat Lum Kaeo Road Should Consider Ozone After the Water Recedes

1. It targets germs carried in by drain water, including bacteria, viruses and mold left after scrubbing.
2. Gas reaches what cloths cannot: under beds, behind wardrobes, beneath shelves and between furniture.
3. It removes musty and sewer odours at the source by breaking down odour molecules rather than masking them. Learn more on the ozone disinfection service page.
4. No chemical residue, since ozone returns to oxygen, which suits rooms with young children and older adults.
5. Rooms are ready to let again sooner, with fewer new tenants turned away by the smell.
6. Shops can reopen with confidence, without a drain smell at the door.
7. It is quick, about 30 minutes per zone, and can be planned room by room.
8. It is backed by certified testing: according to test results certified for the company, 99.99% elimination of viruses, bacteria and mold. See residential ozone disinfection.
9. It is the right finishing step for rooms that have already been washed and dried, before people move back in.
10. Free medical-grade disinfectant spray with ozone jobs of 15,000 baht or more, useful for landlords treating several rooms at once.

Example Case: A Roadside Rental Block in Lat Lum Kaeo After the Water Went Down

An illustrative example of the work sequence, not a review or quote from any real customer.

Ae owns a small rental block on a main road in Lat Lum Kaeo district. The ground floor has several rental rooms and a grocery unit at the front. After a night of heavy rain, water from the blocked drain backed into every ground-floor room. She started by having the drain in front of the building cleared to prevent a repeat, then asked tenants to bring out damaged belongings for sorting. Mattresses that had soaked for a long time and appliances that had been underwater were set aside for an electrician to check.

A cleaning team then shovelled out the mud, washed floors with clean water and detergent, wiped down the lower walls and opened doors and windows, running fans and dehumidifiers for several days until the walls were dry. Once the rooms were dry, Ae contacted WHD on LINE to book ozone treatment. The team planned the work zone by zone. Tenants of the room being treated waited in the common area or went to work as usual. Doors were sealed, with no people, pets or plants inside.

After the rest and ventilation period, tenants returned and noticed that the drain smell that had lingered for days had clearly faded. The grocery reopened. Ae planned to repaint only after confirming that moisture in the walls had really dropped, and asked any tenant with fever or calf pain to see a doctor right away rather than wait.

Recovery Checklist for Khu Bang Luang Rooms, Shops and Homes

Before Ozone

• Switch off power at the breaker before entering a flooded room, and have an electrician check sockets and wiring that were underwater.
• Wear boots, rubber gloves and a mask while removing mud and damaged items.
• Report blocked drains to the landlord or local administration to reduce the chance of repeat flooding.
• Remove all mud and sediment, then wash floors and lower walls with clean water and detergent.
• Throw away food, dry goods, drinks and medicine that touched the water, even if the packaging looks fine.
• Sort out mattresses, pillows, rugs and cardboard boxes that soaked for a long time; most will need to go.
• Open doors and windows and run fans and dehumidifiers until walls and floors are fully dry.

During Ozone

• Everyone, including pets and plants, leaves the treated area.
• Doors and windows of the treated zone stay tightly closed.
• No one opens the door to check during treatment.

After Ozone

• Return only after the rest and ventilation period the team specifies.
• If heavy rain brings water in again, restart washing and drying.
• Wash hands often, especially before eating and after handling items that were in the water.
• Anyone with fever, calf pain, diarrhoea or breathing trouble should see a doctor immediately.

FAQ: Ozone Disinfection After the Lat Lum Kaeo Flood

Q: The water came in for one night and went down. Do I really need ozone?
A: It depends on the room. If it still smells musty or of drains after washing and drying, or mold spots are appearing, germs are still present. Ozone treats germs in the air and in gaps that wiping cannot reach. Water from a backed-up drain is often heavily contaminated, so a short flood should not be ignored.

Q: Can ozone replace cleaning?
A: No. Mud removal, washing and drying always come first. Ozone is an extra step after cleaning, not a substitute.

Q: Do neighbouring tenants have to leave the building?
A: The team plans by zone and seals the treated area. The treated room must be empty of people, pets and plants; other rooms receive case-by-case advice depending on the building layout.

Q: Does WHD have a branch in Pathum Thani?
A: No. WHD is based in Bang Khae, Bangkok. Service in Lat Lum Kaeo is booked by phone at 065-556-6294 or LINE @whd268, with the date and time confirmed in advance.

Q: Will mold never come back after ozone?
A: If walls or floors get wet again, from another flood, a leaking roof or a closed room with no airflow, mold can return. Fixing the source of moisture matters as much as disinfection.

Q: What if someone gets sick after wading?
A: See a doctor straight away, especially with high fever, calf pain or severe diarrhoea, and mention the flood exposure. More information is available from the CDC flood safety pages.

Make Lat Lum Kaeo Rooms, Shops and Homes Liveable Again

Washed and dried, but the musty smell will not go? Talk to the WHD team to plan ozone treatment for the number of rooms and the condition of your space.

See Ozone Disinfection Service

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

Related Links and References

• Residential and building ozone disinfection
• Ozone cleaning service
• Disinfection service
• Siam Rath (25 Sep 2026): flooding of rental rooms, shops and homes on Pathum-Lat Lum Kaeo Road, Moo 6, Khu Bang Luang
• Thai PBS (4 Oct 2026): DDPM flood situation report
• CDC: Floods and cleanup safety
• WHO Fact sheets
• Department of Disease Control, Ministry of Public Health

Note: flood information in this article is attributed to the dated news and DDPM reports above. Conditions and figures change daily.