A Typical Scenario: The Smell Rising Through a Wooden Floor

(An illustrative example case, not a verified customer review.)

Auntie Sri is in her sixties and has lived in a two-storey wooden stilt house by the river since she was young. Her home sits outside the levee, so whenever the Chao Phraya runs high, water flows in beneath the house. She knows the routine. This year felt different. In early October, officials came by to warn residents to lift belongings to higher ground, because dams were releasing more water and sea tides were pushing up the river. Her children and grandchildren hauled the wooden cabinet, chairs, water tubs and storage boxes from the ground level up to the first floor.

What she did not expect was the smell. Water that sat under the house for days mixed with leaves, plastic bags, food scraps and household wastewater, turning dark and foul like a drain. The stench rose through the gaps between the floorboards. Her ground-floor bedroom smelled so bad she could not sleep, her blankets and pillows turned musty, her three-year-old grandson developed an itchy rash on his legs, and mosquitoes swarmed every evening.

Her daughter tried sprinkling lime along the water's edge, lighting incense, running fans and spraying air freshener. Each helped for a few hours. At night, when the breeze dropped, the smell came straight back. She realised the odour was no longer just in the water under the house; it had soaked into the timber, the floor, the fabrics and the air of the whole home.

This is common in riverside homes whenever the water rises. The honest answer is that the problem has two parts. Under the house is an open space that needs draining, clearing and drying. The rooms above are closed spaces where odour and germs have already settled, and that is where ozone treatment helps most.

The Water Situation in Dusit in 2026, and Why You Need to Remove Stagnant Water Smell Under Houses

For accuracy, here is only what has been reported, with source and date. Conditions change daily, so follow announcements from the Bangkok Metropolitan Administration (BMA) and the Dusit district office closely.

• 29 September 2026: the Department of Disaster Prevention and Mitigation (DDPM) declared two Dusit subdistricts, Thanon Nakhon Chai Si and Wachiraphayaban, as flood-assistance zones (Thai PBS, 29 Sep 2026).
• 1 October 2026: the BMA warned two Dusit communities outside the Chao Phraya levee, Ratchaphat Thapthim Ruam Jai and Thewarat Kunchon, totalling 65 households, to move belongings to higher ground because dams were increasing discharge and sea tides were high (Daily News, 1 Oct 2026).

The 1 October item was a precautionary warning; it did not report how deep water actually got in individual homes. But for houses outside the levee, with no wall or embankment between them and the river, high river levels combined with tides commonly push water under the house, and when it does not drain fully it leaves still pools that turn into foul, stagnant water.

The citywide picture shows why damp has lingered this year. Thai PBS reported more than 300 mm of rain in about 48 hours on 25 to 26 September 2026; all 50 districts were declared disaster areas on 26 September; and rainfall from 1 to 25 September reached 487 mm against an average of 269 mm. On 29 September the DDPM declared assistance zones in 38 districts and 118 subdistricts, and on 6 October 2026 it reported 329,000 households affected in Bangkok (Thai PBS; Bangkok Biz News).

Dusit mixes government offices, hospitals and schools with old riverside communities that still have traditional raised wooden houses. These homes are designed to let water pass underneath, which is sound local wisdom. The drawback is that when water sits still under the house for days, plank floors with gaps between the boards let odour and humidity rise straight into the living space.

What Is in the Stagnant Water Under Your House, and Where the Smell Comes From

By stagnant water we mean water that has pooled beneath the house long enough to go bad: flood or tidal water that entered and never fully drained, mixed with kitchen and bathroom wastewater, rubbish, leaves and mud. Once oxygen runs out, microbes break down the organic matter without oxygen and release foul-smelling gases, the rotten-egg and drain odours people notice.

Germs commonly found in this kind of water include:

• Bacteria such as E. coli and Salmonella from sewage and wastewater, causing diarrhoea, stomach cramps and vomiting. Leptospira, the cause of leptospirosis, comes from rat urine; rats are often common along riverbanks and under raised houses. Risk is highest when wading or when feet and legs have cuts.
• Viruses such as norovirus and rotavirus, which cause severe diarrhoea, especially in small children, and spread via hands and contaminated surfaces, plus respiratory viruses like RSV and influenza, which spread easily when a family crowds into small upstairs rooms.
• Mold growing on wood, fabric and walls that stay damp for more than 24 to 48 hours, in line with general WHO and CDC guidance. Mold spores trigger allergies and asthma.
• Disease carriers. Still water under the house breeds mosquitoes and attracts rats and cockroaches, which carry germs into the home.

Common symptoms in a home with a stagnant-water smell include nausea, dizziness, headaches, a stinging nose, coughing, itchy skin rashes and diarrhoea. Older adults, young children, pregnant women and anyone with chronic illness or weakened immunity are most at risk. Anyone with a high fever, calf pain after wading, red eyes, persistent diarrhoea or an infected wound should see a doctor promptly and mention contact with floodwater.

What Happens if the Smell Is Left to Linger

Health. People sleeping on the ground floor of a stilt house breathe rising odour and humidity all night. Older relatives sleep badly and feel weak, small children face higher risk of diarrhoea and skin rashes, and allergy and asthma sufferers flare up more often.

Property. Floorboards, posts and wooden walls that stay damp start to rot, grow mold and attract termites. Fabrics, mattresses and clothes that absorb the smell may have to be thrown away, and furniture carried upstairs while wet can grow mold too.

Time and exhaustion. Riverside families haul belongings up and down several times, wash the house repeatedly and keep watching the river. When the smell will not go, fatigue turns into discouragement.

Community and family. Houses in old riverside communities sit close together, so one home's smell drifts to the neighbours. Relatives living elsewhere hesitate to bring children to stay with grandparents.

Income. Many homes here run small businesses at the front, selling food or groceries or renting rooms. A foul smell keeps customers away and may push tenants to leave.

Why Common Fixes Do Not Get Rid of the Smell

1. Incense or air freshener. Fragrance only masks the stench for a while, incense smoke in a closed room irritates the airways of older people and children, and neither does anything to germs.

2. Pouring powders or liquids into the water under the house. If the water is still connected to the river, anything added is diluted and carried away quickly. Some strong cleaning products release dangerous gases when mixed, so never mix products yourself.

3. Fans to blow the smell away. Fans help ventilation, but while still water and rotting rubbish remain underneath, new odour keeps rising, and the smell already in fabrics and timber stays put.

4. Only washing the upstairs floor. Mopping cleans the surface, but if the source under the house is not dealt with and the air and corners of the rooms are not disinfected, the smell returns within a day.

5. Covering floor gaps with rugs or vinyl. This traps moisture between the planks and the covering, making wood rot faster and letting mold grow unseen.

6. Waiting for the water to go down on its own. The longer you wait, the deeper mold spreads into wood, fabrics and mattresses, and the more mosquitoes and rats multiply. Start as soon as it is safe.

How WHD Ozone Service Helps Remove Stagnant Water Smell Under Houses in Dusit

Ozone (O3) is a strongly oxidising gas. Released into a sealed room, it spreads into every corner, including gaps in floorboards, joints in wooden walls, behind cupboards, under beds and into fabric fibres. It breaks down the cell structures of viruses, bacteria and mold and breaks apart odour molecules, then reverts to oxygen (O2), leaving no chemical residue. According to the test results the company has had certified by Thailand's Department of Medical Sciences and Intertek (UK), it eliminates viruses, bacteria and mold at 99.99%.

An honest point first: ozone only works in an enclosed space. An open-sided space under a stilt house, with wind blowing through and water flowing in and out, cannot be treated with ozone. The area under the house has to be handled physically: drain the water, remove rubbish, scrape out mud and let it dry. Where ozone helps most is the rooms of the house itself, where the odour has risen and settled, and any walled-in ground-floor storeroom that can be fully closed.

The recommended order for Dusit homes:

1. Check safety and plan. Make sure the water has receded and there is no warning of rising water during the work. Contact WHD on 065-556-6294 or LINE @whd268 with details of the house, number of rooms and the smell. The team helps plan the sequence and books a date.
2. Deal with the space under the house. Wear boots, gloves and a mask. Remove rubbish, leaves and plastic, scrape out sediment, open a path for trapped water to drain and let air dry the ground. For large or risky jobs, ask the district office or a contractor for help.
3. Clean the house. Wash wooden floors, walls and soiled furniture. Remove mattresses, pillows, blankets and anything too water-damaged to save. Open windows to dry the rooms.
4. Prepare the rooms. Everyone, including pets and plants, leaves the area. Doors and windows are closed. The team may temporarily seal floor gaps or vents so the room is closed enough for treatment, and cupboards and drawers are opened so the gas can reach inside.
5. Ozone release and contact time. A typical cycle is about 30 minutes per zone; a two-storey house with several rooms is divided into several zones.
6. Rest and ventilate before returning. Wait for the ozone to break down and ventilate as the technician advises before going back in.
7. Keep it up. Check under the house regularly, do not let rubbish or still water build up, and follow BMA water-level announcements.

WHD's office is in Bang Khae, Bangkok 10160, and we serve the whole of Bangkok, including Dusit, by appointment. Queues are long after flooding and we cannot promise same-day arrival, so please call or message ahead. Pricing depends on area and site conditions. Current promotion: a free medical-grade disinfectant spray with any ozone job of 15,000 baht or more.

Safety rules: ozone is used only in a closed space with no people, pets or plants inside. No entry during treatment; return only after the rest and ventilation period the technician specifies. Ozone does not replace draining water under the house, removing damaged items, repairing rotten timber or medical care.

10 Reasons Riverside Homes in Dusit Choose Ozone After Clearing Under the House

1. It reaches floorboard gaps and corners that cloths cannot.
2. It breaks down odour at the source, not just masking it like incense or sprays.
3. It targets many germ groups: bacteria, viruses and mold, at 99.99% per the company's certified test results. See the ozone service
4. No chemical residue, which suits homes with older adults and small children.
5. It treats salvageable fabrics such as curtains, pillows and cushions along with the room.
6. It reduces mold on cleaned, dried wood, helping wooden homes feel fresh again.
7. It is quick: about 30 minutes per zone, so families do not have to move out for days.
8. It suits many home types: stilt houses, row houses, townhouses and rental rooms in Thanon Nakhon Chai Si and Wachiraphayaban. Ask about residential service
9. Clear safety guidance on preparing the house and when to return.
10. Easy to reach: 065-556-6294 or LINE @whd268. Book post-flood ozone treatment

Before and After: A Riverside Stilt House in Dusit

Note: results depend on the house, how clean and dry it is, and the river level. If water returns under the house, that area must be dealt with again first.

Example Case: A Wooden House With a Walled Ground-Floor Storeroom

(An illustrative example case, not a verified review.)

Ek, in his early forties, looks after his parents' wooden house in a riverside community. Half the space under the house is walled in as a storeroom; the other half is open. After the high water in early October, the storeroom had a film of mud on the floor, soggy cartons and a strong stagnant-water smell, while the open side still had pools of still water.

Ek contacted WHD on LINE @whd268. The team advised waiting until the water had receded with no new warning, then clearing rubbish and mud from the open side, opening a drainage path, removing the soggy cartons, washing the storeroom floor and walls and leaving the door open for a few days to dry.

On treatment day the family took his parents to a relative's home for half a day. The team treated the closed storeroom first, then the bedrooms and living room upstairs, followed by rest and ventilation. Ek said the night-time smell had dropped so much that his mother slept through the night for the first time in days. The team advised checking under the house after every high tide and not storing paper or fabric on the ground floor during flood season.

Checklist for Riverside Communities

Before you start

• Follow BMA and Dusit district water announcements; never work under the house while water is rising.
• Cut ground-floor power if water came in, and have an electrician check before use.
• Always wear boots, rubber gloves and a mask under the house; avoid wading barefoot.
• Remove rubbish, leaves and plastic, scrape out mud and open a path for water to drain.
• Remove water-damaged mattresses, fabrics and cartons.
• Wash floors, walls and furniture; dry within 24 to 48 hours where possible.
• Contact WHD on 065-556-6294 or LINE @whd268 to assess and book.

On the day

• All people, pets and plants out; arrange a temporary place for older relatives.
• Doors and windows closed; cupboards open as advised.
• No entry during treatment; return only when the technician says so.

Afterwards

• Check under the house after every high tide or heavy rain.
• Turn over containers that collect water to reduce mosquito breeding.
• Keep food sealed so it does not attract rats and cockroaches.
• See a doctor for fever, calf pain, red eyes, diarrhoea or infected wounds.

FAQ: Remove Stagnant Water Smell Under Houses in Dusit

Q: Can you ozone the open space under my stilt house?
A: We do not recommend it. Ozone must be used in an enclosed space to work and to keep it safe. The open area needs draining, clearing and drying. Rooms in the house and walled-in ground-floor rooms can be treated.

Q: Water is still pooled underneath. Should we ozone indoors now?
A: Clear as much water and rubbish as possible first; while the source remains, new odour keeps rising. The team will help judge the right timing.

Q: Our wooden floor has lots of gaps. Will treatment still work?
A: Yes. The team temporarily seals gaps and vents where practical and divides the house into zones so the gas reaches everywhere.

Q: An elderly relative is bedridden. What should we do?
A: Nobody may be in the treated area. Move them to a relative's home or an untreated room temporarily and return after ventilation. If they are unwell, consult a doctor as well.

Q: What does it cost and how soon can you come?
A: Pricing depends on the size of the house and site conditions. Call 065-556-6294 or LINE @whd268 for a quote. Dates depend on the current queue, and the team confirms the appointment in advance.

Q: Can ozone stop the next flood?
A: No. It disinfects and removes odour where it is applied. If water returns, clean and dry again before considering another treatment.

Let Your Dusit Riverside Home Breathe Again

Talk to WHD about removing the stagnant water smell and disinfecting your home in Thanon Nakhon Chai Si, Wachiraphayaban and the Chao Phraya riverside communities.

Book Ozone Odour Treatment

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

Related Services and References

• Residential and building ozone disinfection
• Disinfection service
• Test certificates
• Thai PBS (29 Sep 2026): DDPM flood-assistance zones in Bangkok
• Daily News (1 Oct 2026): BMA warns communities outside the Chao Phraya levee
• Thai PBS: Bangkok rainfall 25 to 26 Sep 2026
• Bangkok Biz News: DDPM households affected in Bangkok
• CDC: Floods and cleanup safety
• WHO fact sheets

Note: figures reflect the dates given in news and DDPM reports and change daily.