The Khan Na Yao Flood of 2026 (B.E. 2569): What Was Reported

Published details specific to Khan Na Yao are limited, so we cite only sourced facts. Please follow the latest BMA and Khan Na Yao district office announcements as well.

• 25 September 2026: Thai PBS reported that the Bangkok Governor signed a declaration making Ram Inthra and Khan Na Yao sub-districts disaster zones because heavy rain had made travel and access to the area difficult.
• 27 September 2026: Thai PBS reported water of 10 cm or more on Seri Thai Road near Soi Seri Thai 56.

For Bangkok overall in 2026 (B.E. 2569), Thai PBS reported more than 300 mm of rain in about 48 hours on 25 to 26 September; all 50 districts were declared disaster zones on 26 September, and flooded points rose to 135 on 27 September. DDPM figures reported by Bangkok Biz News on 6 October 2026 put affected Bangkok households at about 329,000. Nationally, DDPM data as of 06:00 on 7 October 2026, published by the Government Public Relations Department, listed 27 provinces plus Bangkok, 123 districts, 984 sub-districts, 1,154,875 households and more than 3.1 million people affected.

Even where reported water levels in Khan Na Yao were modest compared with other areas, sustained heavy rain, waterlogged roads and weeks of saturated air are enough to keep bathrooms, kitchens and closed corners damp all the time. That is exactly what pink slime and mold like best.

A Typical Scenario: A Townhome in Ram Inthra

Example case invented to illustrate a common situation. It is not about any real resident and does not claim that this happened in any specific Khan Na Yao home.

Fon lives in a two-storey townhome in the Ram Inthra area with her husband and primary-school daughter. During the late-September downpours, water pooled at the village entrance so small cars struggled to pass. Inside, the water never rose high, but it seeped under the back door and the floor drain in the downstairs bathroom backed up. For almost a week, everyone shared the single upstairs bathroom.

That bathroom has a small window and an exhaust fan that had been broken for ages. It rained every day and towels never dried. Within days, Fon saw a pink ring at the toilet waterline, orange-red grout under the shower and slippery pink slime around the drain. She wiped it off, but two or three days later it was back.

Downstairs, where the drain had backed up, a thin film of silt coated the floor after the water receded, there was a strong drain smell and black mold appeared in a ceiling corner. Fon grew worried because her daughter had just started wearing contact lenses for sport and kept the lens case beside the bathroom sink. She searched "what is pink slime in the bathroom", "is it dangerous" and "how do I stop it coming back".

The answers showed her that the stain was not the real problem. Moisture that never left the bathroom was. The fix had to cover everything: scrubbing, repairing ventilation, drying the room, and finally treating the room air.

What Is Serratia, and Why Is the Stain Pink?

Serratia marcescens is a rod-shaped, gram-negative bacterium found widely in soil, water, damp surfaces and everyday environments. Its signature is a red pigment called prodigiosin, which it often produces at room temperature, giving its films colours from pale pink and orange to deep red.

So pink bathroom slime is not mold, even though it grows in the same places and often appears alongside black mold. A practical difference: pink slime is slippery and wipes off easily but returns fast, while black mold tends to form spots or patches embedded in grout and silicone.

Where Pink Slime Grows

• The toilet bowl waterline and under the inner rim
• Grout and silicone around showers and bathtubs
• Around floor drains and sink drains
• Shower curtains, soap dishes and shampoo bottles with water pooled at the base
• Toothbrush holders and rinse cups
• Pet water bowls that are not washed daily

Why It Spreads Faster After a Flood

Serratia needs moisture, food and time, and a flood supplies all three.

• Sustained humidity. Days of rain saturate the air, and bathrooms without windows or with broken fans never dry.
• Soap and shampoo residue. Fats and phosphorus compounds in soap scum feed the bacteria, and residue builds up faster when a whole family shares one bathroom.
• Less cleaning. Everyone is busy moving belongings and dealing with the house, so bathrooms are left longer than usual.
• Still water in unused bathrooms. Toilets and drains that sit unused for days develop film and odour.
• Silt from drain backflow. When drains back up, sediment from the pipes coats the floor, bringing a mix of microbes.

Is Pink Bathroom Slime Dangerous? Who Should Be Careful

For most healthy people, pink slime is a hygiene nuisance rather than a direct danger. But Serratia is an opportunistic bacterium: it can cause infection when it enters the body through an open route or when immunity is weak. Medical literature describes several types of Serratia infection, mostly in hospitals:

• Urinary tract infections, especially with urinary catheters
• Wound infections
• Respiratory infections in frail patients
• Eye infections such as keratitis, linked to contact lenses and dirty lens cases

People Who Should Take Extra Care

• Contact lens wearers: do not keep the case in a damp bathroom, never rinse lenses or cases with tap water, and replace cases as recommended.
• People with weakened immunity, such as those on chemotherapy, transplant recipients and people on immunosuppressants.
• Bedbound patients cared for at home, people with urinary catheters or pressure sores.
• Older adults and infants.
• Anyone with open wounds, especially cuts from flood cleanup.

Symptoms That Need a Doctor

Contact lens wearers with red, painful or blurry eyes or light sensitivity should remove their lenses and see a doctor promptly. So should anyone with a red, hot, swollen or pus-filled wound, painful urination with fever, or a bedbound patient with fever. Anyone who waded through floodwater and develops high fever, calf pain or red eyes should mention it so leptospirosis can be considered.

This is general information, not diagnosis or treatment advice. Seeing pink slime does not mean anyone at home is infected. It means the bathroom is too damp and needs proper cleaning.

Pink Slime, Black Mold and Musty Odours: Problems That Travel Together

Black mold in grout and ceilings. Mold needs the same moisture. Bathroom ceilings where steam settles daily and dark corners are usually first. Gypsum ceilings that are swollen or moldy inside should be replaced.

Musty and drain odours. Damp towels, constantly wet mats and dry or clogged drain traps produce musty smells, sewer smells and sometimes a rotten-egg smell, among the most searched problems after a flood.

Slime in drains. Hair, soap scum and flood silt combine into slime in pipes, slowing drainage, causing odour and reseeding surfaces.

Because they share one cause, scrubbing off pink slime without fixing moisture is like mowing weeds without pulling the roots. It comes back within days.

How to Remove Pink Bathroom Slime Properly and Keep It Away

1. Protect yourself: rubber gloves, open window or exhaust fan, and a mask if mold is present.
2. Scrub with a brush and cleaner: detergent or bathroom cleaner on the toilet rim, grout and drains, with a small brush or old toothbrush for grout lines.
3. Use a surface disinfectant per its label, such as a chlorine product diluted as directed, leave for the stated time and rinse. Never mix bleach with acidic toilet cleaners or ammonia.
4. Clean accessories: wash shower curtains, soap dishes and toothbrush holders and dry them in the sun; wipe the bottoms of shampoo bottles.
5. Flush unused toilets and drains, and pour water into floor drains to refill the traps.
6. Dry the bathroom after every use: squeegee walls and floor, run the exhaust fan for at least half an hour, leave the door open.
7. Repair the exhaust fan. Without ventilation, moisture always brings the stain back.
8. Move contact lens cases out of the bathroom, use proper solution and replace cases on schedule.

If a drain backed up, shovel out silt first, wash the floor and lower walls with clean water and detergent, then use a surface disinfectant, and discard mats or fabrics soaked in drain water.

Why Wiping, Sprays and Deodoriser Blocks Are Not Enough

• Wiping alone looks good instantly, but if moisture and soap scum remain the stain returns within days.
• Air fresheners and deodoriser blocks mask musty and drain odours without reducing the cause or airborne germs.
• Strong bleach in a closed room irritates eyes and lungs and does nothing about a room that never dries.
• Painting over stained ceilings that are still damp or moldy inside leads to bubbling paint and returning mold.
• Fans in unscrubbed rooms speed drying but can spread spores and dust.

Effective bathroom recovery covers surfaces, ventilation and room air. Once the room is scrubbed and dry, ozone is the supporting step that reaches what a cloth cannot.

Ozone Disinfection in Khan Na Yao, 2026 (B.E. 2569), with WHD

The residential and building ozone disinfection service from World Health Disinfection (WHD) releases ozone gas (O3) into a sealed, unoccupied room. Ozone is an oxidising gas that helps break down the structures of virus, bacteria and mold groups and odour molecules in the air and on surfaces it reaches, then reverts to oxygen (O2), leaving no chemical residue.

According to the company's certification data, the service was tested by Thailand's Department of Medical Sciences and Intertek (UK) and reduced viruses, bacteria and mold by 99.99% under those test conditions. Serratia belongs to the bacteria group the service targets, but WHD does not claim test results against Serratia specifically. Ask the team for the test documents if you want the details.

Be clear about the role: thick pink slime must be scrubbed off by hand first. Ozone does not lift slime or soap scum from grout, and it does not turn a damp room into a dry one. If moisture is not fixed, the stain returns. Ozone's role is to treat the air and surfaces after scrubbing, helping reduce musty and drain odours and airborne mold spores in bathrooms and other damp rooms.

The Post-Flood Ozone Process

1. Survey and assessment by phone or LINE, with photos of bathrooms and rooms, pink slime, mold or odour spots, flood level and floor area.
2. Scrub, remove silt and dry first, including discarding soaked items and replacing swollen or moldy ceilings.
3. Empty and seal the room: all people, pets and plants out, doors and windows closed, fans off as advised.
4. Ozone cycle, typically about 30 minutes per zone, depending on room size and conditions.
5. Rest and ventilate as the technician directs. Nobody enters early.
6. Re-entry after the technician confirms, then keep the bathroom dry after every use.

WHD is based in Bang Khae district, Bangkok 10160, and serves Bangkok including Khan Na Yao, Ram Inthra and the Seri Thai Road area. Upcountry customers can call or message on LINE about travel. Dates follow the actual queue, and same-day service is not promised.

Is Ozone Dangerous? Safety Rules First

• The room must be empty of people, pets and plants. Children, older adults, lung patients and bedbound patients stay out for the whole cycle and rest period.
• The room must be sealed so gas does not leak to occupied rooms.
• Ventilate before re-entry after the time the technician sets.
• Clean and dry first; thick slime and silt reduce results.
• It is not medical treatment. Eye inflammation, infected wounds or fever need a doctor.

Ozone does not replace removing wet, moldy porous materials such as gypsum, carpet or mattresses, does not fix leaking pipes or roofs, and does not penetrate deep into materials.

10 Reasons Khan Na Yao Homes Should Consider Ozone After the 2026 (B.E. 2569) Flood

1. Helps reduce musty, drain and rotten-egg bathroom odours after scrubbing and fixing drains.
2. Treats air and surfaces across the room, including ceilings, corners and behind the toilet.
3. Helps reduce airborne mold spores that often accompany pink slime.
4. No chemical residue, since ozone reverts to oxygen, which suits homes with children once ventilated.
5. Targets bacteria, virus and mold groups, 99.99% according to the company's certification data, with documents available.
6. Suits windowless bathrooms in townhomes and shophouses around Ram Inthra and Seri Thai.
7. Quick, typically about 30 minutes per zone.
8. Whole-home treatment in one visit, including bedrooms, living rooms and kitchens. Ask about ozone services.
9. A reassuring final step before bedbound or older relatives return home.
10. Full guidance from scrubbing and drying to safe re-entry. See post-flood ozone with WHD.

Promotion as stated on the company website: ozone jobs from 15,000 baht receive a free medical-grade disinfectant spray, subject to company terms. Prices are quoted only after assessing the site.

Before and After: A Khan Na Yao Bathroom After the Flood

Recovery Checklist for Khan Na Yao Homes After the 2026 (B.E. 2569) Flood

• Wear gloves, boots and a mask; cover wounds while cleaning.
• Remove drain-backflow silt; wash floors and lower walls with detergent.
• Scrub pink slime from toilet rims, grout, drains and accessories.
• Use a surface disinfectant per its label; never mix products.
• Discard soaked mats and fabrics; check gypsum ceilings for hidden damp.
• Repair exhaust fans and ventilate until rooms are dry.
• On ozone day, remove people, pets and plants; return only after the technician's go-ahead.
• Afterwards, squeegee after showers, scrub weekly, wash pet bowls daily, and keep lens cases out of the bathroom.

FAQ: Pink Bathroom Slime, Serratia and Ozone After the Khan Na Yao Flood

What is the pink slime in my bathroom?

Usually the bacterium Serratia marcescens, which makes a red-pink pigment and grows on damp surfaces with soap residue. It is not mold.

Is pink bathroom slime dangerous?

Rarely for healthy people, but it is opportunistic and can cause infections in contact lens wearers, people with weak immunity, bedbound patients or people with wounds. Scrub it and keep the bathroom dry.

How is pink slime different from mold?

Pink slime is slippery and wipes off easily but returns quickly. Black mold forms embedded spots in grout and silicone. Both come from moisture and often appear together.

Why does pink slime keep coming back?

Because the bathroom stays damp and soap scum feeds the bacteria. Ventilate, squeegee after use, repair the fan and clean regularly.

What should I use to clean pink slime?

Detergent or bathroom cleaner with a brush, then a surface disinfectant per its label, such as diluted chlorine, with ventilation and no mixing of products.

Does ozone help with pink slime?

The slime must be scrubbed off first. Ozone then treats room air and surfaces, reduces musty and drain odours, and targets bacteria, virus and mold groups per the company's certification, without a Serratia-specific claim or replacing moisture control.

Is ozone dangerous?

Yes if people stay in the room during treatment. The room must be empty and sealed, and you return only after the technician's go-ahead and ventilation. Done this way, ozone reverts to oxygen.

Should I throw away a shower curtain or bath mat with pink slime?

A plastic curtain can usually be scrubbed or machine-washed and dried in the sun. Fabric mats or curtains soaked in drain backflow, or ones that stay stained and smelly after washing, are better replaced, since they hold moisture against the floor and keep feeding the problem.

Can pink slime spread to the kitchen?

Yes. Any damp surface with food or soap residue can grow it, such as sink drains, dish racks and sponges. Dry racks daily, replace sponges often and wipe the sink after use, especially during humid post-flood weeks.

How much does ozone treatment cost?

It depends on area, zones and conditions, quoted after assessment. Call 065-556-6294 or LINE @whd268.

Is there ozone service near me in Khan Na Yao or Ram Inthra?

Yes. WHD, based in Bang Khae, serves Khan Na Yao, Ram Inthra, Seri Thai Road and the rest of Bangkok by appointment.

Talk to WHD About Bathroom and Home Ozone in Khan Na Yao, 2026 (B.E. 2569)

Send photos of your bathroom, pink slime, mold or drain-odour spots and other damp rooms. The team will help plan the work and schedule treatment.

See WHD Ozone Disinfection

Call 065-556-6294  |  LINE @whd268

Email worldhealthdisinfection@gmail.com  |  World Health Disinfection, Bang Khae, Bangkok 10160

Related Links and References

• Residential and building ozone disinfection
• Disinfection spraying service
• Certificates and test documents
• Thai PBS: Ram Inthra and Khan Na Yao disaster declaration, 25 Sep 2026
• Thai PBS: Bangkok flood points incl. Seri Thai Road, 27 Sep 2026
• Thai PBS: Bangkok rainfall, 25 to 26 Sep 2026
• PRD: DDPM flood situation as of 7 Oct 2026
• CDC: Floods and cleanup safety
• WHO: Fact sheets
• Department of Disease Control, Thailand

Note: flood figures are as reported on the dates stated and change daily. Health information is general and not a medical diagnosis.