The 2026 (B.E. 2569) Min Buri Flood: What the Reports Said

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

• Rainfall in the 24 hours to 25 September 2026 reached 99 mm in Min Buri, and on the same day Suwinthawong Road had standing water of about 15 to 20 cm (FM91 and Thai PBS).
• On 29 September 2026, Sihaburanukit Soi 14 and Suwinthawong Road near Hathairat Road had water of about 20 cm (Siam Rath).
• On 4 October 2026, the Suwinthawong section near Hathairat still had around 20 cm.
• At 07:00 on 6 October 2026, the U-turn under the bridge in front of Lotus's on Suwinthawong still had water at kerb height across two traffic lanes (Bangkok Biz News).

Across Bangkok, the rain of 25 to 26 September 2026 led to all 50 districts being declared disaster areas on 26 September, and the Department of Disaster Prevention and Mitigation (DDPM) reported on 6 October that 329,000 Bangkok households were affected. 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.

What makes Min Buri a strong case for odour problems is the duration. Water lingered from late September into early October. Still water mixed with drain sediment, canal silt and road runoff is exactly the low-oxygen environment in which these bacteria flourish. When it finally drains away, what remains indoors is not just dampness but mud that is actively fermenting.

A Typical Scenario: The Suwinthawong Shophouse That Smelled Every Afternoon

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

Ae runs a small grocery on the ground floor of a three-storey townhouse in a lane off Suwinthawong Road. In late September 2026, water from the main road crept into the lane and then into the shop. It was only ankle to mid-calf deep, but it stayed for days.

When the water receded, Ae and her husband swept, hosed and wiped until the shelves looked clean. By the next afternoon, as sunlight hit the shopfront, a smell like rotten eggs mixed with sewer gas came back. It was strongest after rain. Customers asked whether the septic tank had burst. Her daughter complained of headaches while doing homework downstairs, and her grandmother, who has asthma, began coughing.

Incense, charcoal bags and air freshener each helped for half a day. A plumber friend finally found a thin layer of black mud under the drinks fridge, behind the shelving and beneath the wooden pallets for bottled water. Scraped up, it smelled unmistakably of rotten eggs. The drain grate outside was packed with black sediment, and the ground-floor bathroom trap had no water in it.

What Are Sulfate-Reducing Bacteria (Desulfovibrio)?

Sulfate-reducing bacteria, often shortened to SRB, live where there is little or no oxygen: canal sediment, rice-field mud, stagnant ponds, wastewater systems, sewers, septic tanks, and even the human and animal gut. Desulfovibrio, a small curved rod, is the best-known genus in the group.

What sets these bacteria apart is how they breathe. Instead of using oxygen, they use sulfate, a compound found in water, soil, detergents, fertiliser and waste, to generate energy. The by-product is hydrogen sulfide gas (H₂S), which smells like rotten eggs. The human nose detects it at very low concentrations.

Hydrogen sulfide also reacts with iron in soil to form black iron sulfide. That is why mud that has sat in floodwater for days often turns dark grey or black, while freshly deposited silt is brown. Scrape off the top layer and you will often find a black layer underneath where air cannot reach. That hidden layer is where these bacteria are most active.

It is important to keep perspective. Desulfovibrio is not a common cause of illness in healthy people. Medical literature describes it in some infections, such as abdominal abscesses or bloodstream infections, but mostly in people with underlying conditions or open wounds, and these cases are uncommon. In a flooded home, the main concern is the gas these bacteria release, and the fact that a rotten egg smell usually signals that the mud also carries sewage, septic waste and other germs.

Why Post-Flood Mud in Min Buri Smells Like Rotten Eggs

Min Buri is a suburban district on Bangkok's eastern side, with housing estates, townhouses, shophouses, markets and low-lying land near canals. When heavy rain keeps water on main roads like Suwinthawong for days, drains back up and push their bottom sediment into streets and homes. That sediment already hosts sulfate-reducing bacteria.

• Long standing water, no oxygen. Still water loses dissolved oxygen, especially near the mud. Oxygen-using bacteria slow down and sulfate reducers take over.
• Plenty of food. Food scraps, leaves, grass, sewage and soaked household materials give the bacteria energy.
• Sulfate from wastewater. Household greywater, detergents and fertilisers provide the raw material for the gas.
• Heat. Bangkok stays hot and humid at the end of the rainy season, so reactions run fast and gas escapes easily in the afternoon.
• Mud in hidden spaces. Under cabinets, beneath laminate floors, behind skirting boards, in tile joints and inside drain grates, where air cannot reach and drying is slow.

That is why the smell is often worst on hot afternoons, after rain re-wets the mud, and when opening a house shut overnight.

Is the Rotten Egg Smell After a Flood Harmful? Symptoms to Watch

The question most people search is whether this smell is dangerous. The answer depends on concentration and location. In an ordinary home with some leftover mud, levels are usually low, but they can still cause discomfort and irritation. In enclosed spaces such as septic tanks, sewage pits, underground drains or basements that held water, the gas can build up to seriously dangerous levels.

Common complaints in homes with a persistent rotten egg smell include:

• Headache, dizziness and light-headedness
• Nausea and loss of appetite
• Stinging, red or watery eyes
• Irritated nose and throat, coughing
• Poor sleep, irritability and fatigue
• Worsening symptoms in people with asthma

A warning sign to leave immediately is when a strong smell suddenly seems to vanish while you are still in the same place. High concentrations of hydrogen sulfide numb the sense of smell. Combined with breathing difficulty, severe dizziness, confusion or collapse, this means you must move to fresh air at once. Never climb into a pit or drain to help someone without proper equipment. Call emergency services on 1669.

Take extra care with young children, older adults, pregnant women, people with asthma, lung or heart disease, and anyone who stays home all day. If symptoms persist, or if anyone develops fever, diarrhoea, calf pain after wading or a red, swollen wound, see a doctor and mention flood or mud exposure. Mud that smells of rotten eggs usually shares a source with sewage, which may carry other germs.

This article offers general information, not medical advice. Diagnosis and treatment belong with a doctor.

Where Black Mud and Rotten Egg Odour Hide After the 2026 Min Buri Flood

The smell does not come from the air. It comes from a source that still holds mud or wastewater. Finding that source is half the battle. Common hiding places include:

1. Dry drain traps. Sinks, basins and floor drains rely on a U-bend of water to block sewer gas. After a flood the water is often siphoned out or evaporates, so gas rises straight into the room.
2. Street and front-yard drain grates packed with black sediment that releases gas in the sun.
3. Under fridges, chest freezers and washing machines, where nobody lifts the appliance.
4. Beneath click-lock laminate or vinyl floors, where mud slipped underneath and cannot dry.
5. Behind skirting boards and inside wall cavities, especially lightweight or gypsum walls.
6. Under stairs and in storerooms with no windows or airflow.
7. Cardboard boxes, carpets, mats and cushions that soaked up wastewater.
8. Sumps and septic tanks, which may malfunction after flooding and push odour back through pipes. Leave these to plumbers or a licensed waste service; never enter them yourself.

A simple test: walk room by room on a warm afternoon. The strongest corner is usually near the source; black residue with a clear rotten egg smell confirms it.

How the Smell and Black Mud Affect Min Buri Households

Health. Breathing the smell every day can bring headaches, sore eyes and poor sleep. Combined with dampness that feeds mold, people with allergies or asthma often feel worse after a flood, which is why searches for "allergies after flooding" rise.

Money. Hydrogen sulfide tarnishes metal. Switches, sockets, door handles and electronics in smelly rooms may wear faster, and metal pipes left in mud can corrode.

Time and livelihood. Shops and food stalls along Suwinthawong and Sihaburanukit depend on walk-in customers. A few days of rotten egg smell can drive them away, and longer closures mean longer income loss.

Why Mopping, Drain Cleaner and Air Freshener Do Not Make It Go Away

• Air freshener and incense only mask the smell for a while. Gas keeps forming in the leftover mud, and perfume mixed with sulfide can make people feel worse.
• Cleaning only what you can see leaves mud under appliances, floors and joints where bacteria keep working.
• Pouring bleach down drains may help briefly on the pipe surface but does not remove sediment. Mixing bleach with acidic toilet cleaners or ammonia releases dangerous gases. Never mix products.
• Closing up and running the air conditioner traps gas inside, and the unit may not keep up with moisture at first.
• Charcoal or baking soda absorbs odour in small spaces but cannot cope with a whole house that still has a source.
• Painting over stains on damp walls leads to blistering, and mold and odour return from inside.

The right order is: remove the mud, wash, dry, refill drain traps, fix the plumbing, and only then treat the odour and germs that remain in the air. Ozone belongs in that last step.

How WHD Ozone Treatment Helps With Rotten Egg Odour After the Min Buri Flood

Ozone (O₃) is a strong oxidising gas. Released into a sealed room, it reacts with odour molecules in the air and on exposed surfaces, including the sulfur compounds behind rotten egg and sewer smells, and it damages the structure of bacteria, viruses and mold in the air and on surfaces it reaches. 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 Desulfovibrio. Anyone who wants to see the test documents can ask the team or view the certification page.

What ozone can help with: reducing lingering rotten egg, sewer, earthy, sewage and musty odours in room air, and addressing airborne and surface germs it can reach, once mud is out and the space is dry.

What ozone does not do: it does not penetrate thick mud, wall cavities or soaked cushions; it does not replace mud removal, plumbing repairs, septic service or medical care. If mud remains, the smell returns.

WHD Ozone Service Steps

1. Survey. Send photos or video via LINE @whd268 or book a site visit. We ask about water height, days of standing water, odour hot spots and floor area.
2. Clean and dry first. Remove all mud, including under appliances and in joints. Wash surfaces, discard soaked or moldy porous items such as carpets, mattresses and swollen gypsum, ventilate and use fans or dehumidifiers until dry. Refill every drain trap and have a plumber check pipes or septic systems if needed.
3. Empty and seal the room. People, pets and plants leave. Doors and windows close, and air conditioning or exhaust fans are set as the technician advises.
4. Ozone cycle by zone. The technician sets up the generator and controls the cycle, typically about 30 minutes per zone depending on size and conditions.
5. Rest and ventilate. The room rests so ozone can revert to oxygen, then is ventilated as instructed.
6. Re-entry. Return only when the technician confirms it is ready, with advice on keeping traps filled and airing rooms daily.

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, so please request a quote by phone or LINE.

10 Reasons Min Buri Homes and Shops Should Consider Ozone After the 2026 Flood

1. Tackles odour left in the air after mud is gone, in a sealed room.
2. Reaches the whole room, including high corners and gaps behind furniture.
3. Leaves no chemical film, as ozone reverts to oxygen, which suits homes with children and older adults once the room is ventilated.
4. Addresses airborne germs, with 99.99% elimination of bacteria, viruses and mold under test conditions according to company certification. See the service
5. Reduces musty and earthy smells that travel with sulfide odour.
6. Helps with airborne mold spores stirred up during demolition, after moldy materials are removed and the space is dry.
7. Supports shop reopening on Suwinthawong so customers return to a fresh space.
8. Prepares rentals before new tenants or families move back. Request a quote
9. Follows clear safety steps with controlled cycles and timed re-entry.
10. Comes with practical advice on finding the source and planning zones. Talk to the team

Before and After: Following the Right Order

Results depend on site conditions and source removal. If mud or wastewater remains, odour can return.

Example Case: A Shophouse Near Sihaburanukit Where the Smell Came Back With Every Rain

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

A two-unit shophouse near Sihaburanukit Road, with a motorbike repair shop downstairs and living space above, took in water in late September 2026. The owner, Ton, pressure-washed the floor right away, but the rotten egg smell came back after every rain.

After he sent photos on LINE, the team suggested checking three places: the rear gutter packed with black sediment, the dry trap in the ground-floor bathroom, and rubber floor mats that had soaked up wastewater. Ton had a plumber clear the pipes and scoop out sediment, threw away the mats, refilled the traps and ran fans for several days.

Once everything was dry, the ground floor was treated in two ozone zones. Everyone left the building, doors and windows were closed, the technician ran the set cycle, and the space rested and was ventilated before re-entry. The afternoon smell dropped markedly and did not return with the next rain, because the source had been dealt with.

Checklist for Rotten Egg Odour After the 2026 Min Buri Flood

• Wear rubber gloves, boots and a mask when digging or scraping mud.
• Keep doors and windows open while working; step outside if dizzy.
• Move fridges, freezers and washing machines to remove mud underneath.
• Lift swollen flooring or skirting to check for hidden mud.
• Never mix bleach with acidic cleaners or ammonia.
• Never enter septic tanks, sumps or underground drains yourself.
• Discard soaked or moldy carpets, mattresses, cushions and cardboard.
• Before ozone: dry surfaces, refill all traps, repair leaks, remove people, pets and plants.
• After ozone: re-enter only when cleared, air rooms daily, top up unused drains weekly.
• See a doctor if symptoms persist.

FAQ: Rotten Egg Smell After a Flood, Sulfate-Reducing Bacteria and Ozone in Min Buri

What causes a rotten egg smell in the house after a flood?

Mostly hydrogen sulfide made by sulfate-reducing bacteria such as Desulfovibrio in oxygen-poor mud and wastewater, plus sewer gas rising through dry drain traps.

Is the rotten egg smell after a flood dangerous?

In ordinary homes it usually causes headaches, sore eyes and throat irritation. In enclosed pits and drains it can reach seriously dangerous levels. Never enter them, and see a doctor if symptoms continue.

Why is flood mud black?

Hydrogen sulfide reacts with iron in the soil to form black iron sulfide, a sign that sulfate reducers are active. Remove all of it.

How do I fix a smelly bathroom drain after a flood?

Refill every trap with water, clean grates and sediment, and ask a plumber to check vents and the septic system if the smell persists.

Can ozone remove rotten egg smell?

It helps reduce lingering sulfide and sewer odour in air and on surfaces after mud is removed and the space is dry. If the source remains, the smell returns.

Does ozone eliminate Desulfovibrio?

WHD makes no specific claim for this organism. According to company certification, ozone achieved 99.99% elimination of bacteria, viruses and mold under test conditions. Bacteria in mud are handled by removing and washing it out. Ask the team for test data.

Is ozone treatment safe?

Ozone at treatment levels irritates the lungs, so rooms must be empty and sealed, with re-entry only after resting and ventilation as the technician advises. Followed properly, it is safe.

How long does ozone treatment take?

Typically about 30 minutes per zone, plus preparation and rest time before re-entry.

How much does ozone treatment cost?

Prices depend on area, number of zones and site conditions. Send photos to LINE @whd268 or call 065-556-6294 for a quote.

Is there ozone service near me in Min Buri?

WHD is based in Bang Khae, Bangkok, and serves Bangkok including Min Buri. Dates are confirmed by phone or LINE according to the schedule.

Get Advice on Ozone Odour Treatment After the 2026 Min Buri Flood

Send photos of the smelly areas, the floor area and how high the water rose. The WHD team will help locate the source, advise on cleaning and drying, and plan 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
• Ozone cleaning service
• WHD certification documents
• FM91: rainfall and flooding on Suwinthawong, 25 Sep 2026
• Thai PBS: Bangkok flooding, late September 2026
• Siam Rath: Sihaburanukit Soi 14 and Suwinthawong flooding, 2026
• Bangkok Biz News: Bangkok standing water, 6 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 in news and DDPM reports and change daily. Health content is general information, not medical advice.