The 2026 (B.E. 2569) Phra Khanong Flood: What the Reports Said

The points below summarise news reports on the dates shown. Conditions change daily.

• At 18:30 on 25 September 2026, the Bangkok Metropolitan Administration (BMA) listed Sukhumvit 101/1 Soi 3 at the Wat Thung junction as a flooding point (Naewna).
• On 27 September 2026, Vachirathamsathit Road near the Wat Thung three-way junction had water of 20 cm or more (Thai PBS).
• On 4 October 2026, the BMA used boats to push water in Khlong Prawet Burirom towards the Phra Khanong pumping station (Thai PBS).

The affected streets lie in Phra Khanong Tai and Bang Chak subdistricts, a dense residential area of older detached houses, townhouses, shophouses and condominiums. Across Bangkok, rain on 25 to 26 September 2026 led to all 50 districts being declared disaster areas on 26 September. Nationally, DDPM data as of 06:00 on 7 October 2026 listed 27 provinces plus Bangkok, 123 districts, 984 subdistricts, 1,154,875 households and more than 3.1 million people affected.

Days of heavy rain did more than flood roads. They tested every roof. Cracked tiles, gutters blocked by leaves and droppings, and ageing roof joints let water onto ceilings. That is where a problem many families overlook begins.

A Typical Scenario: The Collapsed Ceiling Near Wat Thung

Example case written to illustrate a common situation. It is not an interview with any resident.

Paeng lives in a two-storey townhouse more than twenty years old, in a lane near the Wat Thung junction, with her father, who is in his seventies and receiving chemotherapy. In late September 2026, days of rain left the lane mouth flooded and a little water seeped into the ground floor.

The bigger problem was upstairs. The ceiling in her father's bedroom developed brown water rings, and one morning half a board sagged down, dropping black and white debris onto the floor. Looking up into the gap, she saw thick layers of pigeon droppings, feathers and old nests. The vents under the eaves had never been fitted with bird mesh.

Paeng quickly swept up the debris and used a household vacuum in the corners. Dust filled the room. The next day she started coughing, and the family worried about her father's weakened immunity. His doctor explained that pigeon droppings can carry fungi such as Cryptococcus, which people with low immunity must take seriously, advised him to sleep in another room for now, and asked them to return immediately if fever, headache or an unusual cough appeared.

This happens in many homes in Phra Khanong and other inner districts with large pigeon populations. Floods and leaks do not create droppings, but they bring years of hidden waste down into living space and send people up to deal with it without protection.

What Is Cryptococcus?

Cryptococcus is a yeast-type fungus. Two species matter most in medicine. Cryptococcus neoformans is found worldwide in soil and bird droppings, especially dry, long-accumulated pigeon droppings. Cryptococcus gattii is more often linked to tree bark and soil around certain trees such as eucalyptus.

Pigeon droppings are rich in nitrogen compounds that the fungus likes, so it thrives in sheltered piles under roofs, above ceilings, beneath awnings, in bell towers, under bridges and on unused balconies. Pigeons themselves rarely fall ill from it, but they create the reservoir.

People are exposed by breathing it in. When dry droppings are swept, vacuumed with an ordinary vacuum, blown by wind or dropped with a ceiling panel, tiny fungal particles become airborne and reach the lungs. The infection does not spread from person to person.

Most healthy people who inhale it clear it without symptoms. In people with weakened immunity, it can cause lung infection and, in some cases, spread to the nervous system to cause cryptococcal meningitis, a serious condition that needs prompt hospital care.

Why Bird Droppings Above the Ceiling Matter After the 2026 Phra Khanong Flood

Cryptococcus does not arrive with floodwater, but post-storm conditions raise exposure in several ways.

• Wet, collapsing ceilings. Leaks soften gypsum boards until droppings above fall into rooms.
• Roof and ceiling repairs. Opening hatches, climbing into the roof space, removing old boards and clearing gutters stir up the most dust.
• Gutters clogged with droppings and nests, sending water into walls and ceilings and putting people in direct contact when clearing them.
• Rushed cleanup. Everyone wants the house back quickly, so brooms and household vacuums come out and dust spreads.
• High humidity in the ceiling void, which also lets other molds grow on boards and timber, adding musty odour and spores.
• Vulnerable people at home. Older adults and patients often stay indoors all day during floods.

Droppings can also carry other organisms such as Histoplasma and some bacteria, so proper cleanup protects the whole household, not just against one germ.

Cryptococcus Symptoms and Who Is Most at Risk

Lung symptoms may be absent, or resemble pneumonia: cough, chest pain, breathlessness, fever, fatigue and weight loss.

Nervous system symptoms if it spreads: a headache that builds or lasts for weeks, fever, stiff neck, nausea, vomiting, blurred vision, light sensitivity, confusion or behaviour changes. These need immediate medical attention.

Skin involvement is uncommon and may appear as bumps or sores that do not heal.

People at higher risk of severe infection include:

• People with HIV and low immunity
• Organ transplant recipients
• Cancer patients on chemotherapy
• People on long-term steroids or immunosuppressants
• People with cirrhosis, chronic kidney disease or poorly controlled diabetes
• Older adults with several chronic conditions

Illness tends to develop slowly, sometimes weeks after exposure. If someone at risk has been near dropping dust, tell their doctor early, even without symptoms. This article is general information; diagnosis and treatment belong with a doctor.

Where Droppings and Mold Hide in Phra Khanong Homes

1. Roof voids and the top of ceilings, especially where eave vents lack bird mesh.
2. Gutters and roof downpipes blocked by droppings, feathers and nests.
3. Balconies and awnings, including window ledges and air-conditioner brackets.
4. Outdoor air-conditioner units, where pigeons nest behind coils and dry droppings blow indoors.
5. Upper storerooms and attics left closed for long periods.
6. Fallen ceiling boards and debris that may be mixed with droppings.
7. Curtains, rugs and bedding in rooms where dust fell.

How Droppings and Leaking Ceilings Affect Phra Khanong Households

Health. Beyond Cryptococcus risk for people with low immunity, dropping dust and mold on wet ceilings can trigger allergies and asthma: sneezing, congestion, coughing, sore eyes and poor sleep.

Money. Droppings are acidic and corrode metal roofs, gutters and roofing materials. Neglect leads to bigger repairs, and soaked ceilings must be replaced.

Time and daily life. A room with a collapsed ceiling is unusable. Patients or older relatives must move, and family members take time off to deal with it.

Odour. Wet droppings release a sharp ammonia smell that mixes with musty odour from damp boards and timber.

Why Sweeping, Vacuuming or Air Freshener Is the Wrong Approach

• Sweeping or vacuuming dry droppings spreads the most dust. Household vacuums without fine filters blow particles out of the exhaust.
• Pressure-washing dry droppings sends droplets everywhere.
• Working without a proper mask. Cloth and surgical masks do not filter fine particles well enough; use N95 or better.
• Fans and air freshener. Fans spread dust to other rooms; fragrance only masks odour.
• Closing a new ceiling over old droppings. The waste stays, birds return and the new ceiling fails again.
• Leaving entry points open, so pigeons simply come back.

The right order: wet the droppings, remove them without raising dust, bag them securely, repair the roof and ceiling, block bird access, dry the space, and only then treat remaining airborne germs and odour.

How to Clean Bird Droppings Above a Ceiling Safely

Large deposits in roof spaces are best handled by professionals with protective equipment. For small amounts, when no one at risk is doing the work:

1. Move vulnerable people out first. Older adults, people with low immunity, pregnant women and young children should not do this work or stay nearby.
2. Wear protection: an N95 or better mask, safety glasses, rubber gloves and washable or disposable outer clothing.
3. Turn off air conditioning and fans, and close doors to other rooms.
4. Soak the droppings first with a water mist or a disinfectant used according to its label. Never scrape or sweep them dry.
5. Bag the waste in thick plastic, tie it tightly and double-bag it.
6. Wipe surfaces with damp cloths and discard them. Do not use an ordinary vacuum.
7. Remove protective gear carefully, wash clothes separately and shower.
8. Repair the roof and fit bird mesh over eave vents and gaps.

Never mix bleach with ammonia-based products. Droppings themselves release ammonia, so follow product labels and keep the space ventilated.

Keeping Pigeons Out of the Roof for Good

Cleaning droppings once is not enough if birds can walk straight back in. In Phra Khanong and other inner Bangkok districts, pigeons roost wherever they find shelter close to food, so prevention is part of the cleanup, not an optional extra.

• Fit stainless or galvanised mesh over eave vents, gaps between roof tiles and fascia boards, and any opening larger than a few centimetres.
• Install spikes or slopes on ledges, air-conditioner brackets and awning tops where birds like to perch.
• Clear gutters regularly, especially before and during the rainy season, so leaves and droppings cannot block water flow again.
• Do not feed pigeons near the house, and keep rubbish and pet food covered.
• Check the roof space once or twice a year with a torch from the access hatch, wearing a mask, to catch new nests early.

For condominiums and apartment blocks, raise the issue with the building manager so balconies and common roof areas are treated together. Blocking one unit while the neighbours stay open simply moves the birds next door.

How WHD Ozone Treatment Helps After the 2026 Phra Khanong Flood

Ozone (O₃) is a strong oxidising gas. In a sealed room it spreads throughout the space, damaging the structure of bacteria, viruses and mold in the air and on surfaces it can reach, and reacting with odour molecules such as ammonia from droppings, musty ceiling odour and earthy smells. It then reverts to oxygen (O₂), leaving no chemical residue.

According to the company's certification data, WHD's ozone service was tested by Thailand's Department of Medical Sciences and Intertek (UK), which reported 99.99% elimination of viruses, bacteria and mold under test conditions. WHD does not claim specific testing against Cryptococcus. Ask the team for test data or view the certification page.

What ozone can help with: once droppings are removed, the ceiling repaired and the room dry, ozone helps address spores and germs that may still be in the air after demolition, and reduces ammonia, musty and earthy odours.

What ozone does not do: it does not replace removing droppings, does not penetrate deep into dropping piles or soaked boards, does not fix roofs or block birds, and does not replace medical care.

WHD Ozone Service Steps

1. Survey. Send photos of the ceiling, leak points and affected rooms via LINE @whd268, or book a site visit.
2. Clean and dry first. Remove droppings using wet methods, strip swollen or moldy ceiling boards, repair roof and gutters, block bird access, launder curtains and bedding, and dry the room completely.
3. Empty and seal the room. People, pets and plants leave; doors and windows close; air conditioning is set as the technician advises.
4. Ozone cycle by zone, typically about 30 minutes per zone depending on size.
5. Rest and ventilate so ozone reverts to oxygen, then air the room as instructed.
6. Re-entry only when the technician confirms. Patients with low immunity should also follow their doctor's advice on when to return.

Safety first: during treatment the space must be empty of people, pets and plants and fully closed. Ozone at treatment levels irritates the airways. Do not re-enter until the rest and ventilation period is complete, and always clean and dry before ozone.

WHD includes a free medical-grade disinfectant spray with ozone jobs of 15,000 baht or more. Pricing depends on area and site conditions; please request a quote by phone or LINE.

10 Reasons Phra Khanong Homes Should Consider Ozone After Clearing Droppings

1. Addresses airborne spores after ceiling removal in a sealed room.
2. Reaches the whole room, including high corners near the ceiling.
3. Reduces ammonia odour from droppings and musty smells from wet boards.
4. Leaves no chemical residue, suiting rooms for older adults and patients once ventilated.
5. Backed by test certification: 99.99% elimination of bacteria, viruses and mold under test conditions, according to the company. See the service
6. Prepares rooms for vulnerable family members as an extra step after proper cleanup.
7. Helps with mold on ceilings and timber after moldy materials are removed and dried.
8. Suits condos and rentals being handed back after ceiling repairs. Request a quote
9. Follows clear safety steps: empty, sealed rooms and timed re-entry.
10. Comes with sequencing advice from dropping removal to ozone. Talk to the team

Before and After: A Room With a Collapsed Ceiling and Droppings

Results depend on site conditions and source removal. If droppings remain or birds return, problems recur.

Example Case: Preparing a Room for a Patient Near Vachirathamsathit Road

Example case to illustrate the process, not a customer review.

Noi needed to prepare an upstairs bedroom in her older detached house near Vachirathamsathit Road for her mother, who had recently received a kidney transplant and was about to leave hospital. After the late-September 2026 rain, the ceiling was stained and smelled sharp. Opening it revealed heavy pigeon droppings.

The team suggested she ask her mother's doctor about timing, and have protected workers remove the droppings wet, strip the swollen ceiling, fix cracked roof tiles and fit bird mesh. Meanwhile Noi washed all curtains, pillowcases and sheets.

After the new ceiling was in and the room was fully dry, the bedroom and upstairs hall were treated with ozone while everyone stayed downstairs, followed by rest and ventilation. The ammonia and musty smells were gone, and the family felt more confident about bringing her mother home, while still following medical advice closely.

Checklist: Bird Dropping Fungus and Home Recovery After the 2026 Phra Khanong Flood

• Inspect roofs, gutters and ceilings for stains, swelling and droppings.
• Keep vulnerable people away from the work area.
• Wear an N95 mask, glasses and gloves around droppings.
• Wet droppings before removal; never dry-sweep or vacuum.
• Double-bag waste and tie it tightly.
• Remove swollen or moldy ceiling boards, fix leaks, clear gutters.
• Block bird entry with mesh or grilles.
• Wash curtains, bedding and fabrics in affected rooms.
• Before ozone: dry room; people, pets and plants out.
• After ozone: re-enter when cleared and air rooms daily.
• See a doctor promptly for fever, persistent cough, severe headache or stiff neck, and mention dropping exposure.

FAQ: Cryptococcus, Bird Droppings and Ozone in Phra Khanong

Are pigeon droppings dangerous?

Most healthy people have no symptoms, but in people with low immunity Cryptococcus can cause lung infection or serious meningitis, so clean droppings properly.

How does Cryptococcus spread?

By breathing in dust from dry droppings or contaminated soil. It does not spread between people.

What are the symptoms of Cryptococcus infection?

Fever, cough, chest pain and fatigue; if it reaches the brain, severe headache, stiff neck, nausea, blurred vision or confusion. Seek care immediately.

Who is at risk from bird dropping fungus?

People with HIV and low immunity, transplant recipients, cancer patients on chemotherapy, people on steroids or immunosuppressants, and older adults with chronic illness.

How do I clean bird droppings above a ceiling safely?

Wet them first, wear an N95 mask, glasses and gloves, bag them securely, and never dry-sweep or vacuum. Use professionals for large amounts.

Does ozone eliminate Cryptococcus?

WHD makes no specific claim for this fungus. According to company certification, ozone achieved 99.99% elimination of bacteria, viruses and mold under test conditions, and it is only an extra step after droppings are removed. Ask the team for test data.

Is ozone treatment safe?

Yes, when done in an empty, sealed room with re-entry only after rest and ventilation as the technician advises.

How long does ozone treatment take?

Typically about 30 minutes per zone, plus preparation and rest time.

How much does ozone treatment cost?

It depends on area and conditions. Send photos to LINE @whd268 or call 065-556-6294 for a quote.

Is there ozone service near me in Phra Khanong, On Nut or Bang Chak?

WHD is based in Bang Khae, Bangkok, and serves Bangkok including Phra Khanong. Dates are confirmed by phone or LINE.

Get Advice on Ozone After Clearing Droppings and Repairing Ceilings in Phra Khanong

Send photos of the ceiling, leak points and the rooms your family needs back. The WHD team will help plan the work order and a safe ozone treatment.

See the Ozone Service and Request a Quote

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

World Health Disinfection, Bang Khae, Bangkok 10160. Serving Bangkok; upcountry enquiries by phone or LINE.

Related Links and References

• Residential ozone disinfection service
• Disinfection spraying service
• WHD certification documents
• Naewna: Bangkok flooding points, 25 Sep 2026
• Thai PBS: Vachirathamsathit flooding, 27 Sep 2026
• Thai PBS: draining Khlong Prawet to Phra Khanong pumping station, 4 Oct 2026
• PRD: DDPM figures as of 7 Oct 2026
• CDC: Floods and cleanup safety
• Department of Disease Control, Thailand

Note: figures reflect the dates shown and change daily. Health content is general information, not medical advice.