The 2026 Sai Noi and Bang Yai Flood: An Expanded Disaster Declaration

According to Thansettakij, on 28 September 2026 Nonthaburi announced additional flood disaster zones, bringing the total to 4 districts and 35 subdistricts, including Bang Yai and Sai Noi. In Sai Noi the listed subdistricts include Sai Noi, Sai Yai, Khlong Khwang, Thawi Watthana, Khun Si, Nong Phrao Ngai and Rat Niyom. The report said residential areas had been flooding since 25 September 2026 because of continuous heavy rain and a high Chao Phraya River.

Nationally, the Department of Disaster Prevention and Mitigation (DDPM), as of 06:00 on 7 October 2026, reported 27 provinces plus Bangkok affected, covering 123 districts, 984 subdistricts and 1,154,875 households, with more than 3.1 million people affected. These numbers change daily, so check the latest provincial announcements.

Sai Noi and Bang Yai mix traditional farming communities, rice fields and orchards with fast-growing housing estates. Many homes are still wooden or half-brick, half-wood, with timber floors, solid-wood cabinets used for decades and wooden food safes in the kitchen. Newer estate houses have laminate floors and plywood built-ins. Any wood soaked for days absorbs moisture deep into the grain and becomes an easy place for green mold to grow.

Example Case: Grandmother's Teak Cabinet Turns Green

A typical scenario (an illustrative example, not an interview with any specific resident)

Uncle Piak has farmed rice all his life in Sai Noi. His house is half brick, half wood, with a timber ground floor. The main room holds a large teak cabinet inherited from his mother, and the kitchen has a wooden food safe with wire mesh and a long wooden table where the family eats every evening. In late September 2026 heavy rain fell for days. Water entered the house around 25 September and stayed for about a week, high enough to cover the cabinet legs and every floorboard downstairs.

When the water receded, his daughter scrubbed the mud off the floor, washed the outside of the cabinet until it looked clean and left the doors and windows open. Everyone assumed teak could handle water. Within days, though, a thin white fuzz appeared on the back of the cabinet against the wall, then turned into rings of dark green powder. Velvety green spots formed under the bottom drawer. Several floorboards started to warp, and when one was prised up, the underside was coated in green. The main room smelled musty and earthy even with fans running all day.

Uncle Piak looked at it and said it was the same green as the Trichoderma he used to mix into his fields. His five-year-old grandson began coughing at night and sneezing in the mornings, while his wife, who already has asthma, felt short of breath whenever she sat in the main room for long. His daughter wiped the green powder with vinegar. It came off every time, but returned in two or three days, and when she scrubbed hard she could see green dust drifting in the sunlight from the window.

What Is Trichoderma, and Why Do Farmers Know It?

Trichoderma is a group of fungi that live in soil, plant debris and decaying wood. They grow very fast and produce large numbers of spores that are often green, yellow-green or dark green, hence the everyday name green mold. In Thai agriculture, certain Trichoderma types are produced as biological products to help control soil-borne plant diseases, so farmers in many provinces, including Nonthaburi's rice-growing areas, know the name well.

Indoors, its role changes. This mold breaks down cellulose and wood, so it grows on cabinets, floorboards, door frames, plywood, paper and fabric that stay wet. Large numbers of airborne spores act as allergens that can trigger respiratory symptoms in sensitive people, and the mold also stains and weakens wood and creates a musty smell. Put simply, Trichoderma is helpful in soil but is not a mold you want in a bedroom or a food cupboard.

What it usually looks like: a thin white, cobweb-like fuzz at first, then green powder in concentric rings with white edges, with a texture like powder or velvet that puffs up when wiped. However, many green molds look alike, including some Penicillium and Aspergillus species. Only laboratory testing confirms the species. The good news is that household cleanup is almost the same either way.

For farming families: if bags of Trichoderma starter or biological products were stored indoors and got wet in the flood, move them out of the living space to an equipment shed and follow the manufacturer's or agricultural officers' advice. Do not store them with food or in bedrooms.

Where Green Mold Hides in Sai Noi and Bang Yai Wooden Homes

• Behind cabinets set against walls, where air does not move and moisture from wall and floor collects.
• Under drawers and cabinet base panels, often thin plywood that soaks up water fast.
• The underside of timber and laminate floors. Water beneath dries very slowly, so mold grows underneath while the top looks normal until boards warp or smell.
• Wooden food safes and kitchen shelves, where food crumbs and dish-washing moisture speed growth.
• Table, chair and bed legs, where end grain wicks water above the flood line.
• Door frames, wooden doors and skirting, especially bathroom and back doors.
• Areas under raised houses and storage sheds holding sacks, timber, farm tools and fertiliser bags.
• Natural-fibre items such as reed mats, rattan baskets, paper and cotton stored downstairs.

Warning signs include warped or creaky floors, dark blotches or white residue on wood, a musty smell when a cabinet is opened, green powder in corners, and sneezing or coughing in rooms full of wooden furniture.

Is Green Mold at Home Dangerous? Common Post-Flood Allergy Symptoms

For healthy people, Trichoderma does not readily cause infection, but large amounts of airborne spores trigger allergies and irritate the airways. The World Health Organization notes that damp, moldy buildings are associated with coughing, wheezing and asthma flare-ups. Common symptoms after a flood include:

• Sneezing, congestion and a runny nose, especially in the morning or in moldy rooms
• A dry cough, scratchy throat and a feeling of not breathing freely
• Itchy, red or watery eyes
• Asthma flare-ups in people who already have asthma
• Itchy or irritated skin after handling moldy wood or items

Medical literature describes rare Trichoderma infections in people with severely weakened immunity, such as organ transplant recipients, some dialysis patients and cancer patients during chemotherapy. These cases are uncommon, but they are a good reason for households with such patients to treat mold seriously and keep the patient away during cleaning and sanding.

Others who should take care include young children, older adults, pregnant women, and people with asthma, allergies or chronic lung disease.

Important: If anyone has a fever, wheezing, chest tightness, a persistent cough, or asthma that their usual medicine cannot control, see a doctor promptly and mention the flood and the mold. Ozone treatment is home care, not medical treatment.

Why Vinegar, Wax or Air Freshener Lets Green Mold Return

1. Wiping the surface while the wood is still wet inside. Mold threads reach into the grain, and with high moisture the remainder regrows within days.
2. Dry-wiping or dusting the green powder spreads spores through the house. Use a cloth dampened with water and detergent, wipe gently and wear an N95 mask.
3. Waxing, lacquering or painting right away seals moisture into the wood. Mold grows under the coating and the wood may blister later.
4. Keeping cabinets closed. A shut cabinet is a small humidity chamber. Open the doors, pull out drawers and move it away from the wall.
5. Air freshener masks odour briefly but does not reduce spores or dry anything.
6. Ignoring warped floorboards. Water or mud is often trapped beneath. If you do not look, the mold and smell stay under the house.

CDC guidance is to clean and dry within 24 to 48 hours where possible. Porous materials that soaked for long, such as swollen plywood, particleboard, carpet and mattresses, should generally be discarded, while sound solid wood can usually be cleaned and dried.

Dealing with Moldy Wooden Cabinets and Floors, Step by Step

1. Protect yourself with an N95 mask, rubber gloves, goggles and long sleeves. Keep children, older adults and anyone with asthma away.
2. Empty the cabinets. Wash washable fabrics in hot water and sun-dry them fully. Discard heavily moldy items.
3. Decide what to keep. Sound solid wood is usually salvageable. Swollen, crumbling or delaminated plywood, particleboard and MDF usually need replacing.
4. Clean the wood with a soft brush and a cloth dampened with detergent solution, following the grain, then wipe with a clean damp cloth. Do not soak it.
5. Open up warped floors. Have a carpenter lift warped or smelly boards, clean out mud underneath, and let it dry before relaying.
6. Dry thoroughly. Pull cabinets from walls, open doors, remove drawers, open windows, blow air outdoors with fans and use a dehumidifier if available. Thick timber may take days to weeks.
7. Ozone treatment in an empty room once everything is clean and dry, to reduce airborne spores, surface microbes and lingering odour.
8. Refinish the wood only when it is completely dry.

How Ozone Helps Homes with Green Mold on Wood

Ozone (O3) is a fast-reacting oxidising gas. Released into a closed room, it spreads through the air, behind cabinets, under tables and into cabinets left open, reacting with microbial cell structures and odour molecules before breaking down into oxygen (O2). It leaves no chemical residue on the wood.

According to the company's certification data, the World Health Disinfection ozone service was tested by Thailand's Department of Medical Sciences and Intertek (UK) and eliminated the tested viruses, bacteria and fungi by 99.99%. This article does not claim test results against Trichoderma itself. Trichoderma belongs to the fungi group the service targets, and you can request the test data from WHD or see the certification page.

What ozone helps with

• Reducing green mold spores stirred into the air by wiping and sanding
• Treating microbes on furniture, floor surfaces and inside open cabinets where gas can reach
• Reducing musty, damp-soil and wet-wood odours in living rooms and bedrooms
• Helping in spots you cannot wipe, such as behind a cabinet too heavy to move

What ozone does not do

• It does not replace discarding swollen plywood, carpets, mattresses or heavily moldy items.
• It does not penetrate thick timber and does not dry wood.
• It is not claimed to remove mold toxins within materials.
• It does not replace fixing seepage, opening warped floors, or seeing a doctor.

Is Ozone Dangerous? Safety Rules for Homes with Children and Older Adults

• The room must be completely empty: no people, pets, chickens, birds or plants. Many Sai Noi homes keep animals under the house, so tell the technician to plan safe zones.
• The room stays closed for the whole cycle, with a warning sign on the door.
• Ventilate before re-entry, waiting for the ozone to break down and airing for the time the technician sets.
• Clean and dry first, with no mud, standing water or piles of wet fabric in the room.
• Remove medicines and food, plus anything the owner is concerned about.

Following these rules keeps children and older adults away from ozone entirely, because everyone is outside during treatment and returns once the air is ready.

WHD's Post-Flood Ozone Process for Sai Noi and Bang Yai Homes

1. Survey. Send photos of cabinets, floors and moldy rooms via LINE @whd268 or call 065-556-6294. The team asks about area, room count, floor type and anyone with health conditions.
2. Clean and dry. The team advises which furniture to discard, which floors to open and how long the wood should keep drying.
3. Empty and prepare the room. People, pets and plants leave. Cabinet doors and drawers are opened and cabinets pulled slightly from the wall.
4. Seal the room. Windows and vents are closed, the generator is placed and a no-entry sign goes up.
5. Run the ozone cycle, about 30 minutes per zone depending on room size and conditions, zone by zone in larger homes.
6. Ventilate. The machine is switched off, ozone breaks down, and the room is aired as directed.
7. Re-entry. Once the technician confirms, the owner checks the smell and receives moisture-control advice so green mold does not return.

WHD is based in Bang Khae, Bangkok 10160, with no branch in Nonthaburi. Jobs in Sai Noi, Bang Yai and nearby areas are booked by phone or LINE according to the schedule, and same-day arrival is not guaranteed. Pricing is by quotation after assessment. See the residential ozone disinfection service.

10 Reasons Wooden Homes in Sai Noi and Bang Yai Should Consider Ozone After the 2026 Flood

1. It reduces green spores stirred up by cleaning wood, and post-flood ozone treatment helps with the air afterwards.
2. It helps with cabinets too big to move, reaching behind and around them.
3. It reduces damp-soil and wet-wood smells in living rooms and bedrooms.
4. It leaves no chemical residue on wood, so there is no worry about product on the food safe.
5. It is backed by company certification: 99.99% against the tested viruses, bacteria and fungi, according to the company's data.
6. It takes about 30 minutes per zone, so families return the same day after ventilation.
7. It suits homes with asthma or allergies, reducing airborne triggers after cleaning, alongside medical care.
8. It helps keep treasured old furniture, since solid wood cleaned and dried properly can often be saved.
9. It prepares the home for refinishing, reducing old odours before new wax or varnish.
10. You get honest advice first. The WHD ozone team tells you what must be done before treatment.

Before and After: A Living Room with Green Mold on Wood

Example Case, Continued: Uncle Piak's Home After the Full Process

Uncle Piak's daughter stopped dry-wiping and started wearing an N95 mask whenever she cleaned. Her mother and nephew stayed with relatives on higher ground. The teak cabinet was emptied, pulled from the wall and left open. The swollen plywood bottom drawer was replaced, while the teak body was wiped with detergent solution along the grain. A carpenter lifted six warped floorboards, cleared the mud underneath and let the space dry for almost two weeks before relaying them.

Once the wood was dry, the family booked ozone treatment. Everyone spent the day sorting the farm shed while the technician treated the main room, kitchen and downstairs bedroom zone by zone, then ventilated for the set time. The earthy, musty smell that had hung in the main room for weeks was clearly reduced. Uncle Piak said his mother's cabinet would last many more years, as long as its doors are opened to air more often in the rainy season. His wife saw her doctor as scheduled to review her asthma medicine. (This is an example case. Results depend on each home's condition.)

Green Mold Recovery Checklist for Wooden Homes: Before and After Ozone

Before ozone

• Have an electrician check ground-floor wiring before use
• Wear an N95 mask, gloves and goggles while cleaning
• Empty cabinets, wash what is washable, discard heavily moldy items
• Separate salvageable solid wood from swollen plywood to discard
• Wipe wood with detergent solution, never dry-wipe
• Open warped floors and clear mud underneath
• Pull cabinets from walls, open doors, remove drawers
• Run fans blowing outdoors and a dehumidifier until wood is dry
• Move wet biological product or fertiliser bags out of the house

On treatment day

• All people, pets and plants leave the area
• Open cabinets; remove medicines and opened food
• Keep windows shut and do not enter during the cycle

After ozone

• Wait for rest and ventilation time set by the technician
• Open cabinet doors to air regularly in the rainy season
• Check behind cabinets and under floors weekly for the first month
• Refinish wood only when fully dry
• See a doctor if coughing, wheezing or allergies do not improve

FAQ: Green Mold, Moldy Wooden Cabinets and Ozone After the Sai Noi and Bang Yai Flood

What is the green mold on my wooden cabinet?

It may be Trichoderma, Penicillium or some Aspergillus species, which look similar. Only a lab can confirm, but home cleanup is the same: clean, dry and discard crumbling materials.

Is the Trichoderma used in rice fields dangerous indoors?

For most people it does not readily cause infection, but heavy indoor spore levels can trigger allergies and asthma, and it can be a concern for people with severely weakened immunity. It should not be left growing at home.

Do I need to throw out a moldy wooden cabinet after a flood?

Sound solid wood can usually be cleaned and dried. Swollen, crumbling or delaminated plywood, particleboard or MDF usually needs replacing.

There is mold under my wooden floor. What should I do?

Have a carpenter lift warped or smelly boards, clear the mud, and dry the space fully before relaying. Replace badly damaged boards. Wiping the top alone will not help.

Does ozone get rid of green mold?

According to the company's certification data, the WHD ozone service achieved 99.99% against the tested fungi, bacteria and viruses. Ozone reduces airborne spores, surface microbes and musty odour, but only after cleaning and drying. Ask WHD for the test data.

Is ozone dangerous? Can pets stay inside?

No people, pets or plants may be in the room during treatment. The room stays closed for the cycle and is re-entered after ventilation as directed. Following this makes it safe.

How much does home ozone treatment cost?

It depends on area, room count and site conditions. WHD gives a quotation after assessment. Send photos via LINE @whd268 or call 065-556-6294.

Is there an ozone service near me in Sai Noi or Bang Yai, Nonthaburi?

WHD is based in Bang Khae, Bangkok, with no Nonthaburi branch, but it books jobs in Sai Noi, Bang Yai and nearby areas by phone or LINE according to its schedule. Same-day arrival is not guaranteed.

How do I get rid of the damp-soil smell after a flood?

Find the source, often under floors, behind cabinets, in swollen plywood or wet carpet. Clean and dry it, then use ozone to reduce the remaining odour.

Green Mold on Wood or Musty Smells in Sai Noi and Bang Yai After the 2026 Flood? Talk to WHD

Send photos of your furniture, floors and moldy rooms, and the team will help you decide what to do first and when ozone makes sense.

See the Post-Flood Ozone Service

Call 065-556-6294 | LINE @whd268

World Health Disinfection, Bang Khae, Bangkok 10160. Upcountry jobs booked by phone or LINE. Pricing by quotation.

Related Links and References

• Residential and building ozone disinfection service
• Ozone cleaning service
• Company certification documents
• Contact us
• Thansettakij (28 Sep 2026): Nonthaburi expands flood disaster zones, including Bang Yai and Sai Noi
• Government Public Relations Department: DDPM flood situation as of 7 Oct 2026
• CDC: Floods and cleanup safety
• Department of Disease Control, Thailand

Note: area details and figures follow the dates in news and DDPM reports and change daily. This article is general information, not medical advice.