A typical scenario from Phak Hai (example case)

Auntie La-iad lives in a two-storey teak house on tall stilts that her grandfather built beside the Noi River, long before a paved road reached the village. The water jars, the sewing machine and the sacks of milled rice go upstairs. The boat is tied to a house post. Life moves to the upper floor. The open space beneath the house, normally a place to sit in the shade, mend fishing nets and park the motorbike, simply becomes part of the river for a few weeks.

This year was different. The water rose higher than she expected, filled the space under the house and lapped at the floorboards of the upper level for several days. When the water finally began to fall, she was relieved that the house was still standing. A few days later, though, chalky white and green spots appeared on the stilts. The upstairs floor, which used to smell of old wood, now smelled like wet laundry left in a bucket overnight. Her granddaughter, who came to stay, developed itchy red eyes. Auntie La-iad herself started coughing at night.

She tried everything the neighbours suggested: bleach on the floor, boards dried in the sun, incense, windows open all day. The smell faded at noon, then came back every evening as humid air rose from the flooded fields. Auntie La-iad is a composite character, not a real customer, but her story reflects what many households in Phak Hai are dealing with in 2026.

Where the water is in Phak Hai, and the Ayutthaya picture

Here is what can be confirmed at the time of writing. According to the DDPM report of 2 October 2026, Phak Hai is on the list of flood-affected districts in Phra Nakhon Si Ayutthaya, alongside Sena, Bang Ban, Bang Sai, Bang Pa-in, Phra Nakhon Si Ayutthaya, Bang Pahan, Lat Bua Luang, Nakhon Luang, Wang Noi, Uthai, Tha Ruea and Phachi. A report published on 3 October 2026 (via Manager Online) put the province-wide total at 16 districts and 48,704 households.

To be clear: no district-level household figure for Phak Hai has been published in the sources we rely on. The numbers above are province-level only, and they change every day. For conditions in your own subdistrict or village, follow announcements from the Phak Hai district office, your local administrative organisation and the provincial disaster prevention office.

Geographically, Phak Hai sits on the western side of the province. It is low, flat country crossed by the Noi River and surrounded by rice fields that stretch to the horizon. Most homes are raised wooden houses near the water, half-timber, half-concrete houses along the roads, and older trading communities such as Lat Chado. Low land drains slowly, so water tends to stand longer here than on higher ground.

Why Phak Hai homes face higher germ and mold risk after flooding

How long the water stays. Low fields and flood plains drain slowly. A house that sits in water for days or weeks absorbs moisture deep into its materials. The longer the water stays, the more time bacteria have to settle and multiply on surfaces, and the more chances mold spores have to germinate in places that never fully dry.

What the house is made of. The stilt houses of Phak Hai are beautiful and more water-tolerant than many people think. But wood is porous. Water travels deep into the grain, and the posts, the joints between floorboards, the gaps between wall panels and the area under the stairs hold moisture long after the surface looks dry.

What is stored in the house. Many Phak Hai families farm rice. Under the house or in the rice barn you often find sacks of fertiliser, unmilled paddy, farm tools, nets and boats. Once soaked, these become an excellent food source for mold, especially paddy rice and jute sacks.

What the floodwater carries. Water that flows across paddy fields, animal pens, septic tanks and roads picks up animal dung and urine, human waste, fertiliser and rubbish. Floodwater is not clean river water. It is a mixture that carries many kinds of germs at once.

Every kind of germ that floodwater brings into Phak Hai homes

1. E. coli and Salmonella

These bacteria come from human and animal faeces. When septic tanks and pit latrines are submerged, sewage spreads with the water through the whole village. The bacteria cling to floors, walls, containers and kitchen utensils. Touching a contaminated surface and then your mouth, or eating from a poorly washed plate, can cause diarrhoea, stomach cramps, nausea, vomiting and fever. Small children and older people dehydrate faster than working-age adults.

2. Leptospirosis risk (Leptospira)

Rice fields and flood plains are home to field rats and other rodents. Leptospira bacteria are shed in their urine and survive in standing water and mud. They enter the body through cuts or skin softened by long soaking. Watch for sudden high fever, headache and severe pain in the calf muscles. Anyone with these symptoms after wading or shovelling mud should see a doctor promptly and mention the flood exposure. Do not wait it out at home.

3. Viruses: norovirus, rotavirus, RSV and influenza

Norovirus and rotavirus are leading causes of acute diarrhoea and spread through hands, utensils and contaminated surfaces. RSV and influenza spread through airborne droplets and through hands that touch surfaces. During a flood, families crowd together on the upper floor or move into shelters with many other people, so a virus can pass from one person to many very quickly.

4. Mold and airborne spores

Mold does not arrive only with the water. Spores are always in the air, but they need moisture and food to grow, and a freshly drained wooden house supplies both. White, green or black patches appear on posts, floorboards, wall panels, wooden cabinets and mattresses. Airborne spores trigger allergies, sneezing, a blocked nose, itchy eyes, a scratchy throat and, in some people, asthma attacks. The WHO and the US CDC advise cleaning and drying within 24 to 48 hours to limit mold growth. In slow-draining areas like Phak Hai, that window has usually passed before the water even leaves.

5. Musty and sewage odours

The musty smell comes from volatile compounds released by mold and bacteria as they break down organic material. The rotten, drain-like smell comes from decomposing mud and leftover waste. These odours are more than a nuisance. They signal that microbes are still active inside the house. Perfume or incense may hide the smell for a while, but the cause stays.

Who in a Phak Hai household needs extra care

• Older people. Many Phak Hai households include grandparents who stay home while their children work elsewhere. Weaker immunity means respiratory and stomach infections hit them more often and harder.
• Young children. They crawl on floors, put things in their mouths and lose fluids quickly when they have diarrhoea.
• Pregnant women. They should avoid wading, shovelling mud and spending time in rooms with visible mold.
• People with chronic illness, such as diabetes, kidney disease, heart or lung disease, and anyone with allergies or asthma.
• Farmers and anyone who wades every day, whether checking fields, tending cattle and buffalo, or paddling supplies around. Their risk of leptospirosis and infected foot wounds is higher than average.

What the flood costs Phak Hai families after the water drops

Health. Lingering coughs, flare-ups of allergies, skin rashes and repeat bouts of diarrhoea are common after floods, especially once everyone moves back into a house that is still damp.

Money. Moldy paddy loses its value. Mattresses, pillows, blankets and particle-board furniture have to be thrown away. If mold works its way into the timber, posts and floorboards can rot sooner than they should, and repairing an old wooden house is not cheap.

Time. Many families scrub the house again and again because the stains and smell return whenever the air turns humid. Time that should go to replanting rice or returning to work disappears into cleaning that never seems to finish.

Family. Children working in Bangkok or in the industrial estates worry about their parents falling ill. Grandchildren cannot come back to stay because the bedroom still smells.

Business. For restaurants, grocery shops and souvenir stalls around Lat Chado, a musty smell is the first thing a visitor notices.

Why the usual fixes in Phak Hai do not finish the job

• Bleach on its own. Bleach disinfects smooth surfaces, but it does not soak evenly into wood grain and floorboard joints. Used too strong in a closed house, its fumes irritate the airways. Never mix bleach with toilet cleaner or ammonia.
• Sun and fans. These are necessary and you should use them. But sunlight does not reach under floorboards, inside cabinets or into the roof space, and fans can blow mold spores around the whole house.
• Incense, perfume and air freshener. They cover the smell but do nothing about the source.
• Painting or oiling over the wood. If the timber is still wet and mold is underneath, the paint blisters and the mold pushes back through.
• Shutting the smelly room. A closed, damp room is exactly what mold likes best, and the problem spreads to the rooms next door.

None of these steps is wrong, but together they are incomplete. What is missing is a step that deals with germs and odour in the air and in the gaps that hands and cloths cannot reach. That is where ozone comes in.

How WHD's ozone disinfection service works for Phak Hai homes

World Health Disinfection (WHD) is a disinfection company based in Bang Khae, Bangkok. We do not have a branch in Phak Hai or anywhere in Ayutthaya province. Our team can take your request and plan service in the area, with travel and access confirmed in advance by phone (065-556-6294) or LINE (@whd268). We do not promise same-day arrival, because road conditions, water levels and the job schedule all have to be checked first.

Our residential and building ozone disinfection service uses ozone gas (O3), a strong oxidiser that breaks down the cell structures of viruses, bacteria and mold and reacts with odour molecules. Afterwards the ozone reverts to oxygen (O2), so no chemical residue is left in the house. According to test results certified for the company by Thailand's Department of Medical Sciences and Intertek (UK), the process eliminates viruses, bacteria and mold by 99.99%.

Because it is a gas, ozone spreads through a closed space and reaches the gaps under floorboards, the seams in wall panels, the space behind cabinets and the ceiling, places a cloth never touches. That makes it well suited to wooden houses full of joints and cavities.

The process step by step

1. Consultation and assessment. Send photos, room sizes and post-flood conditions via LINE so the team can assess the job and plan the trip to Phak Hai.
2. Readiness check. Confirm that the mud has been removed and the house washed and reasonably dry.
3. Preparation. Everyone, including pets and plants, leaves the area. Doors and windows are closed so the gas can work fully.
4. Ozone fill. Ozone is released into the room or zone being treated.
5. Contact time. The gas reacts with germs and odours, typically about 30 minutes per zone depending on size and condition.
6. Rest and ventilation. The ozone is allowed to break down, the area is aired out, and people re-enter only when the team says it is safe.

Important safety rule. Ozone treatment is carried out in a closed space with no people, pets or plants inside, and re-entry happens only after the rest and ventilation period. Ozone comes after mud removal, washing and drying. It does not replace cleaning, drying or medical care. Anyone with fever, diarrhoea or calf pain after wading must see a doctor.

10 reasons Phak Hai homes should consider ozone after the flood

1. Wooden houses have more hiding places than concrete ones. Floorboard joints and under-floor cavities shelter spores, and a gas reaches them better than a cloth.
2. The water stayed far past 48 hours. Houses soaked for days hold deeper contamination and benefit from an extra step after cleaning.
3. Odour is treated at the source. Ozone reacts with odour molecules rather than masking them. See the ozone service page for details.
4. No chemical residue. Ozone turns back into oxygen, which suits homes with toddlers and elderly relatives.
5. Rice barns and storerooms benefit too. Enclosed spaces that held paddy, fertiliser and farm tools grow mold fast and smell strongly.
6. Certified 99.99% results. Based on test results certified for the company by the Department of Medical Sciences and Intertek. The certificates are on our certification page.
7. Short time per zone. About 30 minutes per zone, without tearing the whole house apart.
8. Less repeat scrubbing. With fewer germs in the air and the gaps, the chance of mold and smell returning drops too.
9. Suits small community businesses. Restaurants and souvenir shops around Lat Chado can welcome visitors back with more confidence. See service packages and details.
10. Better value when neighbours book together. Relatives in the same village can combine jobs, and any ozone job of 15,000 baht or more comes with a free medical-grade disinfectant spray.

Before and after ozone in a Phak Hai wooden house

Note: results depend on removing mud, washing and drying before treatment. Materials that are still saturated or permanently damaged may need to be replaced first.

Example case: a two-storey stilt house and rice barn on the Noi River

This example case is an illustrative scenario based on common job types. It is not a review from any specific customer.

Somchai, the eldest son, works in Bangkok and came home to Phak Hai to help his parents after the water went down. The family home is a two-storey wooden house on tall stilts, with a small wooden rice barn beside it. Water filled the space under the house almost up to the upper floor for several days. The family shovelled mud from under the house, washed the posts with clean water and detergent, threw out mattresses and moldy sacks of paddy, and left the house open to sun and wind for nearly a week.

Even so, his mother's bedroom still smelled musty and the rice barn smelled strongly stale. Somchai contacted WHD on LINE and sent photos of the house, the barn and the room sizes. The team confirmed the route and set a date once the village road was dry enough for a vehicle. On the day, the family took both parents and the cat to stay with relatives. The team divided the property into zones, the upstairs bedroom, the central hall, the kitchen and the rice barn, and treated them one at a time, observing rest and ventilation periods before letting the family back in.

In this example, Somchai noticed afterwards that the smell in his mother's room had faded almost completely and the barn could be used to store tools again. The team reminded the family to keep ventilating if any post still felt damp inside, and to take his parents to a doctor if their cough did not clear, because ozone looks after the house, not the people in it.

Phak Hai flood recovery checklist: before and after ozone

Before cleaning

• Wait until the authorities say it is safe. Have an electrician check any socket or breaker box that was submerged before switching power on.
• Wear rubber boots, rubber gloves, a mask and eye protection. Cover any cuts on hands and feet.
• Watch for snakes, centipedes and other animals that may have sheltered under the house or in woodpiles.
• Photograph the damage for assistance claims.

While cleaning

• Remove all mud from under the house, the kitchen and the bathroom.
• Discard absorbent items that cannot be washed: mattresses, pillows, carpets, swollen ceiling boards and moldy rice sacks.
• Wash posts, floorboards and wall panels with clean water and detergent, paying attention to joints and gaps.
• Wash dishes and utensils in clean water, then disinfect them following Department of Health guidance.
• Check the septic tank and toilet. If damaged, have them inspected before use.

Drying

• Open doors and windows for cross-ventilation. Lift a few floorboards if possible to let the under-floor space breathe.
• Use fans, but only after moldy materials are out, so spores are not blown around.
• Give the timber time to dry from the inside. Do not paint or seal it yet.

During and after ozone

• Everyone, plus pets and plants, must be out of the area during treatment.
• Re-enter only when the team confirms the rest and ventilation period is over.
• Keep airing the house daily for a while so humidity does not build up again.
• Watch your family's health. Fever, calf pain, diarrhoea or a persistent cough means a visit to the doctor.

FAQ: ozone disinfection after the flood in Phak Hai

Does WHD have a branch in Phak Hai?

No. WHD is based in Bang Khae, Bangkok. The team can plan a trip to serve Phak Hai, with the route and date confirmed first by phone (065-556-6294) or LINE (@whd268). Same-day service is not guaranteed.

The water has not fully drained. Can I book now?

You can consult and send details in advance, but treatment should happen after the water is gone and the house has been mucked out, washed and dried. If mud or standing water remains, germs come back quickly.

Is ozone safe for an old wooden house?

Wooden houses can be treated. The team sets timing to suit the size and condition of the house. Particularly delicate heirlooms, such as old textiles on a family shrine, can be discussed with the team and moved out beforehand.

Can you treat a rice barn or tool shed?

Yes, provided the space can be reasonably closed. Remove heavily moldy paddy and goods first, because ozone will not make spoiled rice usable again.

How long do we need to stay out?

Roughly 30 minutes per zone plus the rest and ventilation period. Total time depends on how many zones there are, and the team will tell you beforehand. People, pets and plants must stay out until told they can return.

After ozone, do we still need a doctor?

Yes, if anyone is unwell. Ozone disinfects the house; it does not treat illness. Fever, calf pain, diarrhoea, rashes or a persistent cough need medical attention, and you should mention the flood exposure.

Is there a promotion?

Ozone jobs of 15,000 baht or more receive a free medical-grade disinfectant spray. Ask by phone or LINE for details.

Let your Phak Hai home smell of good timber again

Muck out, wash, dry, then finish with ozone disinfection. Talk to the WHD team to plan service in Phak Hai district.

See the Ozone Disinfection Service

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

Related services and references

• Residential and building ozone disinfection
• Ozone cleaning service
• Test certificates
• Contact WHD

References

• DDPM flood report, 2 Oct 2026, via Bangkok Biz News: bangkokbiznews.com
• Manager Online, 3 Oct 2026, Ayutthaya flood situation: mgronline.com
• Khaosod English, 29 Sep 2026, national flood overview: khaosodenglish.com
• US CDC, Floods: cdc.gov/floods; WHO fact sheets: who.int

Flood figures change daily. Please check the latest official announcements.