The 2026 Lat Lum Kaeo Flood: 30 Ground-Floor Rental Rooms Under Water

According to a Siam Rath report on 25 September 2026, rain that fell heavily all night flooded 30 ground-floor rental rooms, as well as shops and homes along Pathum to Lat Lum Kaeo Road, Moo 6, Khu Bang Luang. The reported cause was roadside drains blocked with soil, sand and stones, so rainwater could not drain away fast enough and flowed into the buildings.

Nationally, the Department of Disaster Prevention and Mitigation (DDPM) reported as of 06.00 on 7 October 2026 that 27 provinces plus Bangkok were affected, covering 123 districts, 984 subdistricts, 1,154,875 households and more than 3.1 million people. These figures change daily, so please follow the latest local announcements.

Flooding from blocked drains has its own character. The water that comes in usually carries silt, sand and smelly drain water with it. Ground-floor rental rooms are typically small, with few windows and poor airflow, so they hold moisture long after the water drops. Tiled floors, lower walls, mattresses, door mats and curtains become places where mold can start growing within days.

Example Case: A Tenant Sneezing Every Morning After the Water Dropped

This is a typical scenario based on situations commonly seen after floods. It is not an interview with a real person.

Mint, in her twenties, works at a factory in the Lat Lum Kaeo area and rents a small ground-floor room. On the night of the heavy rain, water from the road came into her room high enough to soak half the mattress she kept on the floor. She stayed with a friend for two nights, then came back, swept out the water, mopped the floor and put the mattress outside to dry.

A week later she started sneezing in bursts every morning when she woke up. Her nose was so blocked she had to breathe through her mouth, and her eyes itched the whole time she was in the room. At work, though, she felt better. Looking more carefully, she noticed grey-black spots along the bottom of the walls, around the bathroom door frame and under the mattress, which had never fully dried. The room smelled both musty and like a drain.

Mint told the landlord, who found that several other rooms had similar problems. The landlord then began looking into ozone treatment for rental rooms to restore the whole floor so tenants could move back in with confidence.

What Is Alternaria, and Why Is It Called an Allergy Mold?

Alternaria is a genus of fungi commonly found in soil, on plants and in outdoor air, especially in humid weather. When it gets into damp buildings, it grows as dark grey, olive-green to black colonies, often velvety or slightly fuzzy. Its spores are relatively large, with a distinctive club-like shape, and they become airborne easily once dry.

In medicine, Alternaria is one of the most important allergenic molds. It has been linked to allergic rhinitis and to asthma flare-ups in both children and adults. People who are sensitive to this group may react even to fairly small amounts of spores.

As with other dark molds, grey-black spots on a wall are not always Alternaria. Identifying the species requires laboratory testing. But the approach to mold in a flooded room is the same for every type: cut off moisture, remove badly damaged materials, clean, dry and reduce spores in the air.

Where Allergy Mold Hides in Rental Rooms and Ground-Floor Homes After a Flood

• Lower walls and room corners below the old waterline, especially walls behind wardrobes or beds.
• Mattresses and floor futons that got wet and never fully dried; mold may grow underneath where you cannot see it.
• Carpets, door mats and floor mats that soak up water and trap silt.
• Bathrooms, grout and bathroom door frames, which are damp anyway and become even damper after a flood.
• Window sills and curtains in closed, stuffy rooms.
• Wallpaper and lightweight partition walls that absorb water; mold may grow behind them unseen from the front.
• Air conditioners and fans that draw in damp air and spores and blow them around the room.
• Under sinks and around waste pipes, where drain smells often come back up after a flood.

Small rental rooms have little space and often only one window, so airborne spores become more concentrated than in an open house. Tenants who sleep there every night are exposed continuously.

Post-Flood Allergy Symptoms: Sneezing, Blocked Nose, Itchy Eyes, Cough and Wheeze

Common symptoms in people sensitive to molds such as Alternaria include:

• Bursts of sneezing, especially on waking or entering a closed room.
• Blocked or runny nose, itchy nose, itchy roof of the mouth.
• Itchy, red or watery eyes.
• Dry cough, throat irritation or a hoarse voice.
• Wheezing, chest tightness or shortness of breath in people with asthma.
• Symptoms that worsen indoors and ease outside.

Risk groups include young children, older adults, pregnant women, people with existing asthma or allergies, people with chronic lung disease, and anyone with weakened immunity. Rental rooms where several family members share a small space need extra care.

If anyone has difficulty breathing, wheezing that does not improve with medicine a doctor previously prescribed, a high fever or symptoms lasting several weeks, they should see a doctor and mention that their room was recently flooded and has mold. Anyone who waded through floodwater and then has fever and calf pain should consider leptospirosis and see a doctor too. This article is general information, not treatment advice.

What Landlords and Tenants in Lat Lum Kaeo Should Do After the Water Drops

For landlords, mold and musty odours do not only affect tenants' health; they directly affect rental income and reputation. Steps to take:

• Inspect every room the water entered, not only the rooms tenants report.
• Clear the drains around the building of soil, sand and stones to reduce the chance of flooding again.
• Check lower walls, ceilings, wallpaper and air conditioners.
• Plan cleaning, drying and ozone treatment floor by floor or zone by zone, with tenants moving out temporarily during treatment.
• Communicate clearly with tenants about the schedule and when they can return.

For tenants, tell the landlord as soon as you see mold or notice a musty smell. Throw away mattresses and carpets that got soaked, wash sheets and curtains, open windows to ventilate, and if your allergies are severe, sleep elsewhere temporarily until the room has been dealt with.

Why Mopping, Air Freshener or Running the Air Conditioner Alone Does Not Ease Allergies

• Mopping the floor alone does nothing about mold on lower walls, under mattresses or behind wallpaper.
• Air freshener only masks the smell, and some fragrances themselves trigger allergy symptoms.
• Running the air conditioner in a damp, moldy room can pull spores in and blow them out again. Clean the unit after the room has been treated.
• Airing a mattress outside for a few hours rarely dries the core, so mold keeps growing.
• Using bleach on plaster or wallpaper is not suitable for porous materials, and bleach must never be mixed with ammonia or certain toilet cleaners.
• Painting over damp walls lets mold push back through.

Effective cleanup covers three areas: materials, moisture and air. Ozone treatment helps with the air and odour once the room has been cleaned and dried.

How Ozone Helps Reduce Mold Spores, Musty Odours and Drain Smells in Rental Rooms

Ozone (O3) is a highly reactive oxidiser. Released into a closed room at a controlled concentration, it reacts with the cell structures of microorganisms and with odour molecules, then breaks down back into oxygen (O2), leaving no chemical residue.

According to the company's certification data, WHD residential ozone disinfection has been tested by Thailand's Department of Medical Sciences and Intertek (UK), with stated effectiveness of 99.99% against viruses, bacteria and fungi under test conditions. Those results cover the groups the company lists, not Alternaria in any particular room, so we do not claim ozone removes this specific mold completely. If you want more detailed test data, please ask WHD.

After a flood, ozone helps reduce spores and microbes in the air of a closed room once it has been cleaned, reaches hard-to-access exposed surfaces such as the tops of wardrobes and ceiling corners, and helps break down musty, earthy, drain and stagnant-water odours trapped in the room, the main complaint in rooms flooded from blocked drains.

What ozone does not do: it does not replace discarding soaked, moldy mattresses, carpets, wallpaper or gypsum board. It does not dry walls, does not penetrate deep inside materials, does not unblock drains, does not remove mycotoxins, and does not treat allergies. Anyone with symptoms still needs to see a doctor.

Is Ozone Treatment Dangerous? Safety for Multi-Room Rental Buildings

At disinfection concentrations, ozone irritates the airways, so treatment must happen in a room that is empty of people, pets and plants, kept closed throughout. After the cycle, the room rests so ozone can break down, then is ventilated as the technician advises before anyone returns.

• In rental buildings, tenants of the treated room and of adjoining rooms connected by vents should leave as the technician advises.
• Seal vents or gaps under doors leading to occupied rooms.
• Remove pets, plants, fish tanks and food.
• Never open the room mid-cycle, and return only when the technician says so.
• People with asthma should wait until the room is well ventilated.

A typical cycle is about 30 minutes per zone, depending on room size and conditions. For buildings with many rooms, the technician plans the zone order.

WHD's Post-Flood Ozone Process for Rental Rooms and Homes in Lat Lum Kaeo

WHD is based in Bang Khae, Bangkok 10160, with no branch in Pathum Thani. Service in Lat Lum Kaeo and Khu Bang Luang is planned by phone or LINE first to confirm the area, date, time and travel.

1. Survey and assessment. Send photos of rooms, lower walls, moldy spots, the number of rooms and building size via LINE.
2. Mud removal, cleaning and drying. Discard soaked mattresses, carpets and wallpaper, scrub mold from hard surfaces, clear drains and ventilate until dry. This always comes first.
3. Empty and seal the room. Tenants, pets, plants and food leave; doors, windows and vents are closed.
4. Ozone cycle. The technician controls the equipment, about 30 minutes per zone, room by room or floor by floor.
5. Rest and ventilate. Wait for ozone to revert to oxygen, then open up for airflow.
6. Re-entry. Once the technician confirms, clean the air conditioners, open windows regularly and watch the old spots.

Pricing is quoted per job by floor area, number of rooms and damage. If you are searching for an ozone price for rental rooms, send photos and the number of rooms to LINE @whd268 for a quote. Current promotion: ozone jobs from 15,000 baht receive a free medical-grade disinfectant spray.

10 Reasons Lat Lum Kaeo Rental Rooms and Homes Should Consider Ozone After the 2026 Flood

1. It helps reduce airborne mold spores that trigger allergies in small rooms.
2. It reaches ceiling corners and behind wardrobes that wiping cannot.
3. It helps break down drain and musty smells, the main issue with drain-related flooding. See the WHD ozone disinfection service.
4. It leaves no chemical residue or fragrance that could irritate allergy sufferers.
5. It comes with reference testing, according to the company's certification data.
6. About 30 minutes per zone, so rooms can be done one at a time without closing the whole building for long.
7. It helps tenants move back in with confidence, protecting the landlord's reputation and income.
8. It suits rental rooms, shops and homes. See ozone treatment for flooded rental rooms.
9. Technicians plan zone order and safety rules for multi-room buildings.
10. It helps plan the whole building's recovery, pointing out damp spots or materials to replace before you book ozone disinfection in Pathum Thani.

Before and After: A Ground-Floor Rental Room After a Flood

Results vary depending on damage and aftercare.

Example Case, Continued: Mint's Room After Every Step

A typical scenario based on common situations, not a real customer review.

The landlord sent photos of the whole floor to the technician, who advised discarding the soaked mattresses, peeling off swollen wallpaper on the lower walls, scrubbing mold from walls and grout, clearing the drain in front of the building, and ventilating for several days until the walls were dry. Only then was ozone treatment booked zone by zone. Each tenant went out according to the schedule the landlord shared and returned when the technician confirmed the rest and ventilation period was over. Mint said the drain smell and musty odour in her room dropped a lot, her morning sneezing gradually improved, and she switched to a raised bed instead of keeping her mattress on the floor.

Recovery Checklist for Allergy Mold in Rental Rooms, Before and After Ozone

• Wear an N95 mask, gloves and eye protection while scrubbing mold. People with severe allergies or asthma should not do this themselves.
• Discard mattresses, carpets and mats soaked by floodwater.
• Peel off wallpaper or remove partition walls that are soaked and moldy.
• Scrub mold from plaster, grout and window sills with a brush and soapy water, then dry.
• Clear drains around the building of soil, sand and stones.
• Open windows and use exhaust fans or dehumidifiers until dry.
• Keep the room empty and sealed during ozone treatment; return only when the technician says so.
• Clean air conditioners after the room is treated and ventilate daily.
• If allergies or asthma flare, see a doctor.

FAQ: Allergy Mold, Sneezing, Blocked Nose and Ozone After Floods

Why do I sneeze every morning and have a blocked nose since the flood?

It may be mold spores growing in your room after the flood, such as Alternaria, especially if symptoms are worse indoors and better outside. Look for mold, control moisture and see a doctor if things do not improve.

What is Alternaria?

A common genus of mold found in soil and on plants that grows as dark grey to black colonies on damp surfaces. It is one of the most important allergenic molds, linked to allergic rhinitis and asthma.

How can I prevent allergies after a flood?

Discard wet, moldy materials, clean, dry and ventilate the room, clean the air conditioner and reduce airborne spores. People with allergies should not scrub mold themselves.

Who is responsible for mold in a rental room after a flood?

It depends on each lease and local agreement. Tenants should tell the landlord as soon as they find mold, and landlords should inspect every flooded room to plan recovery together.

Can ozone help with mold allergies?

Ozone helps reduce spores and odour in the air of a closed room after cleaning and drying. According to the company's certification data it was tested against virus, bacteria and fungi groups at 99.99% under test conditions, but not specifically against Alternaria, and it does not treat allergies. See a doctor for symptoms.

Is ozone dangerous, and do neighbouring rooms need to leave?

The treated room must be empty of people, pets and plants. Adjoining rooms connected by vents should follow the technician's advice. Each cycle is about 30 minutes per zone, followed by rest and ventilation.

How much does ozone treatment for rental rooms cost?

It is quoted by number of rooms, floor area and site conditions. Send photos to LINE @whd268 or call 065-556-6294 for a quote.

Is there ozone service near me in Lat Lum Kaeo?

WHD is based in Bang Khae, Bangkok, with no Pathum Thani branch. Contact the team by phone or LINE to plan and confirm travel. Same-day arrival is not guaranteed.

How do I get rid of a drain smell in my room after a flood?

Clean drains and waste pipes, refill the water traps, wash floors and walls the water touched, dry the room, then ozone-treat the empty room to help break down lingering odour.

Mold and Musty Smells in Your Lat Lum Kaeo Rental Room or Home After the 2026 Flood? Talk to WHD

Send photos and the number of rooms so the team can help plan the recovery order before ozone treatment of empty, dry rooms.

See WHD Ozone Disinfection

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

Related Links and References

• WHD residential and building ozone disinfection
• Ozone cleaning service
• Test certificates
• Siam Rath (25 Sep 2026): Rental rooms, shops and homes flooded on Pathum to Lat Lum Kaeo Road
• Government Public Relations Department: DDPM flood data as of 7 Oct 2026
• CDC: Floods and cleanup safety
• Department of Disease Control, Thailand

Note: flood figures refer to the dates in the reports and change daily. Health information is general knowledge, not diagnosis or treatment.