A Story From the Field: Once a Year, the House Starts Over

Auntie Boonruean is sixty-seven. She lives in a two-storey timber house with a concrete kitchen extension at the back, right on the Chao Phraya River in Bang Toei sub-district, Sam Khok, Pathum Thani. The house sits outside the flood barrier. She has lived there since she was a young woman, and she can remember that almost every year, from late September into October, the river rises into the space under the house or into the kitchen. In 2026 the water came higher than expected, flooding the kitchen and the storeroom for nearly three weeks.

Her son, who works in Bangkok, comes back every weekend to help. Each year follows the same script. When the water rises, they rush to carry everything upstairs. When it falls, they spend several exhausting weekends shovelling mud and scrubbing. This year her son noticed things he had not paid attention to before. His mother was coughing more often. The upstairs bedroom had a musty smell. Patches of white mold had appeared on the timber posts under the house, and the old wooden food cabinet the family had used for decades was starting to rot.

"Why do we have to start from zero every single year?" he asked. This year, the two of them decided to think differently: instead of reacting to each flood as an emergency, they would build an annual plan that could be repeated, prepared for in advance and budgeted.

Life Outside the Flood Barrier: Not If, but When

Along the Chao Phraya in Sam Khok, in communities such as Bang Toei, Chiang Rak Yai, Chiang Rak Noi, Krachaeng and Ban Pathum, many homes stand outside the flood barrier. Families here have lived with the river for generations and understand its rhythm better than anyone. What makes each year's recovery harder is not the water itself. It is the damage that quietly accumulates from one year to the next.

• Timber and concrete hold moisture over time: if the house never dries fully before the next flood season, moisture levels creep upwards year after year.
• Mold digs in deeper: mold that isn't fully dealt with this year becomes a starting point that spreads faster next year.
• Older residents' health: the people living in these homes full-time are often elderly parents, who are more sensitive to mold spores and flood-borne germs.
• Hidden costs: belongings thrown away every year, a steady trickle of small repairs, and the days of leave taken by children and grandchildren who come to help.

Seeing these costs clearly is the first step towards reducing them. A good annual plan doesn't try to stop the river. It tries to make sure each flood does less lasting harm than the one before.

There is real wisdom in how riverside families have always coped: raised floors, open space under the house, belongings kept upstairs during the wet months. An annual plan simply builds on that wisdom with a few modern tools, such as written records, dehumidifiers, professional disinfection and controlled ozone treatment, so that the house and the people in it stay healthier from one flood season to the next.

Health Risks That Arrive With the Water Each Year

When the Chao Phraya comes into a house, it brings mud, wastewater from drains and septic tanks, and debris from upstream. That water can carry bacteria such as E. coli, which causes diarrhoea, and the organisms that cause leptospirosis. A house that stays damp for weeks will grow mold, which can trigger allergies, asthma and skin irritation.

For older people living alone or as a couple, it is important that children, grandchildren or neighbours handle the tasks that involve contact with floodwater and mud. If anyone develops a high fever, muscle pain or unusual coughing and breathlessness after the water goes down, they should see a doctor promptly.

Why the Same Routine Every Year Doesn't Make the House Better

• A bleach wash and nothing more: it helps on smooth surfaces but never reaches into the timber and concrete that soaked up water, so mold returns every year.
• Sunning only what can be carried outside: the structure itself, the ceilings, walls and fixed cabinets all stay damp.
• Incense or fragrance to mask the smell: the musty odor fades for a while, but spores remain in the bedroom.
• Repainting every year: if the walls aren't dry first, the paint bubbles and the money is wasted.
• No records: nobody remembers exactly which spots were damaged last year or what was done, so each year begins again from scratch.

A Five-Stage Calendar for Riverside Homes

Stage 1: Before the flood season (around July to August)

• Inspect the house against last year's notes, and check which spots are still damp or moldy.
• Move ground-floor belongings onto tall shelving, and swap cardboard boxes for lidded plastic ones.
• Ask an electrician to check the ground-floor wiring and separate circuit.
• Prepare a recovery kit: rubber boots, gloves, masks, shovels, rubbish bags and a disinfectant such as the CHEMGENE HLD4H spray.
• Save your service provider's contact details and book a tentative slot in advance.

Stage 2: While the water is rising (around September to October)

• Follow water-level announcements from local authorities.
• Switch off ground-floor power when the water approaches the house.
• Keep older family members upstairs or with relatives, and avoid wading through water unless necessary.
• Photograph the damage for your records.

Stage 3: Immediately after the water recedes (first week)

• Shovel mud while it is still wet, wash floors and sort out items that must be thrown away.
• Open every door, window and cabinet, and pull furniture away from walls.
• Disinfect the ground floor, the space under the house, the kitchen and bathrooms to reduce flood-borne germs.

Stage 4: One to two months after the water recedes

• Run a dehumidifier in closed rooms, and check whether walls and timber posts are drying.
• Once the house is drying, carry out full disinfection fogging and ozone treatment of bedrooms, the prayer room, storerooms and the kitchen.
• Make permanent repairs and repaint only once the walls are genuinely dry.

Stage 5: The dry season (around December to June)

• Use the dry weather to ventilate the house as much as possible.
• Improve the house's flood resilience one section at a time.
• Write up the year's notes: what was damaged, what was done, what it cost and what to change next year.

Adapting the House, a Little More Each Year

• Ground-floor flooring: ceramic tiles or polished cement are much easier to clean than timber or laminate.
• Ground-floor walls: avoid wallpaper and gypsum board in areas the water reaches.
• Doors and cabinets: PVC or other water-resistant doors, and free-standing cabinets that can be lifted upstairs instead of built-ins.
• Electrics: raise ground-floor sockets and switches and put the ground floor on its own circuit, carried out by a qualified electrician.
• Under the house: keep it clear, without stacks of timber or sacks, so the wind can move through and dry it quickly.
• Timber posts and floors: if you see signs of termites or rotting wood, have a termite specialist and a carpenter inspect directly.

None of these changes needs to happen at once. Choosing one or two improvements each dry season, guided by your notes, steadily reduces the work needed after every flood.

The Riverside House Notebook: A Small Record That Helps a Lot

What makes an annual plan actually work is keeping notes. It doesn't need to be complicated; a single notebook or a note on your phone is enough. At minimum, record:

• The highest water level and how many days it lasted: make a small mark with the year on a post or wall.
• Damaged spots: which rooms had mold, which cabinet rotted, which section of wall blistered, with photos.
• What was done: the dates of mud clean-up, disinfection fogging and ozone treatment, and the results.
• What had to be thrown away: so next year you don't store the same things on the ground floor.
• Costs: so you can budget realistically for the following year.

After two or three years of notes, a family can see clearly which improvements to the house are worth the investment. The notebook also makes conversations with contractors and service providers much easier, because you can show them exactly what happened last time.

Which Rooms Should Come First

Many riverside homes have several damaged rooms at once, but energy and budgets are limited. A sensible order of priority is:

1. Bedrooms used by older people and children: they spend the most hours there each day and are the most sensitive to mold spores.
2. The kitchen and bathrooms: these areas involve food and water and carry the highest risk from flood-borne germs.
3. The prayer room: it holds religious objects that deserve respectful care, and as a closed room it often traps musty odors.
4. Storerooms and the space under the house: these collect moisture and mold that can spread to other rooms.

Budget Every Year Instead of Paying in an Emergency

Families who live with water every year find life much less stressful when they set aside a small amount each month for post-flood recovery, rather than having to find a large sum at a time when everyone is exhausted and income may have dropped. It helps to split the budget into three parts: preparation before the flood season, such as shelving and plastic storage boxes; recovery after the water recedes, such as disinfection fogging and ozone treatment; and improvements during the dry season, made one area at a time according to the previous year's notes.

Supporting a Parent From a Distance

In many Sam Khok families, the people who own or grew up in the riverside house now work in Bangkok or further away, while elderly parents live there full-time. That makes planning even more important. Share the notebook digitally so everyone can see it, agree in advance who will come back after the water drops, and keep the service provider's LINE contact in a family group so bookings can be made quickly. Ask a trusted neighbour to check on your parents during high water, and make sure they know not to do heavy clean-up work alone. Small arrangements like these prevent older relatives from taking on tasks that put their health at risk.

Caring for an Old Timber House That Floods

Many riverside homes in Sam Khok are traditional timber houses, some of them decades old, built by families who understood the river well. Timber behaves differently from concrete after a flood, and it deserves its own approach.

• Let it dry slowly and evenly: timber that dries too fast in direct, harsh sun can crack or warp. Open the house up for airflow rather than aiming heaters or powerful fans at individual boards.
• Watch the joints: the places where posts meet beams and where floorboards meet walls hold moisture longest and are where white or black mold usually appears first.
• Clean mold gently: use a damp cloth rather than hard scrubbing, which spreads spores and damages the grain, and follow up with disinfection.
• Look for rot and termites: soft, crumbly wood or mud tubes on posts need a carpenter's or termite specialist's eye before the next flood season.
• Respect the old finishes: traditional oils and stains can be reapplied once the timber is dry, which helps it shed water next year.

A Short Pre-Season Checklist to Stick on the Fridge

• Last year's notebook reviewed and problem spots checked.
• Shelving in place and ground-floor essentials in lidded plastic boxes.
• Documents in waterproof pouches upstairs, with photos saved on a phone.
• Electrician's check of the ground-floor circuit completed.
• Recovery kit packed and stored upstairs.
• Medicines for older family members stocked for at least two weeks.
• Neighbour and family contact list shared in the family chat group.
• Service provider's phone number and LINE contact saved, with a tentative booking made.

Ticking these off each July takes an afternoon, and it changes how the whole flood season feels.

What Happens on Treatment Day

When the house has started to dry and you book the main treatment, the team first walks through with a family member to confirm the rooms that need attention, using the notes from the survey. Food, medicines and documents are put away. Appliances, Buddha images, old photographs and antiques are covered or moved out of the rooms being treated. Disinfection fogging is carried out room by room, including the space under the house. Then everyone, including pets, leaves the house, plants are taken outside, and the ozone generator is started with the dose matched to each room. After treatment, the house is opened and ventilated thoroughly, and the family is told clearly when it is safe to return. Many families arrange for their parents to spend that day with relatives or at the temple.

How WHD Fits Into Your Annual Plan

The WHD disinfection service and ozone treatment service are designed to follow the rhythm of a riverside home.

1. Survey and record: we inspect every room and note risk points and damage, so they can be compared the following year.
2. Mud clean-up and sorting advice: we tell you which materials should be removed and which belongings should go.
3. ULV disinfection fogging: we apply CHEMGENE HLD4H as a fine mist that reaches under the house, into gaps between floorboards, behind cabinets and into room corners.
4. Ozone treatment: to reduce mold spores and break down musty odors in bedrooms, prayer rooms and storerooms. No people, pets or plants may be inside during treatment. The dose is matched to the room, and appliances, religious objects, old photographs and delicate antiques are covered or removed first.
5. Ventilation: the house is opened up and aired until it is safe to return.
6. Re-check and summary: we check odors and mold spots and summarise what should be improved before next year's flood season.

10 Reasons Sam Khok Riverside Families Plan With WHD

1. We understand homes that live with water every year and schedule work around the river's rhythm.
2. We survey and record risk points so results can be compared year on year.
3. We disinfect with ULV fogging that covers the space under the house and gaps in the timber.
4. We remove musty odors from elderly parents' bedrooms through our ozone treatment service.
5. We use a controlled-dose ozone generator suited to timber houses and older belongings.
6. We care for religious objects and sentimental items, covering or removing them before treatment.
7. We follow clear safety steps for homes with older residents.
8. We advise on adapting the house to flooding one step at a time.
9. We offer mosquito spraying after the water drops and dust mite removal for mattresses and pillows.
10. We are easy to reach by phone or LINE, so children living far away can coordinate on their parents' behalf.

Before and After an Annual Plan

Customer Voice (Illustrative Scenario)

"I work in Bangkok and can only help Mum at weekends, so every year felt like starting over. This year the team surveyed the house and wrote down where the problems were, disinfected after the water went down, and booked ozone treatment for Mum's bedroom once the house had dried. Now we have a clear plan for next year instead of just hoping for the best."

— Auntie Boonruean's son, timber house on the Chao Phraya, Bang Toei, Sam Khok (illustrative field scenario)

Frequently Asked Questions

Q: If the house floods every year, does it need ozone treatment every year?
A: It depends on how severe the flood and the musty odor are in a given year. In years when the water stays a long time and the smell is strong, disinfection fogging plus ozone treatment once the house dries helps a great deal. In years when the water only reaches under the house, spot disinfection may be enough.

Q: Can an old timber house be treated with ozone?
A: Yes, with the dose and duration properly controlled, and with religious objects, old photographs, appliances and rubber items covered or removed first.

Q: When is the best time for ozone treatment?
A: Once the water has receded and the house has started to dry, usually one to two months afterwards. The first days after the flood should focus on mud clean-up and disinfection.

Q: What should older family members do during ozone treatment?
A: Everyone, including pets, must leave the treated area, plants must be moved out, and nobody should go back in until the team has finished ventilating and confirms it is safe.

Q: Our children live far away. Can they book on our behalf?
A: Yes. They can contact us on LINE, send photos of the house and choose a date when a family member can be present on the day.

Q: Do you serve Sam Khok and Pathum Thani?
A: Yes. We serve Sam Khok, Mueang Pathum Thani, Lat Lum Kaeo, Khlong Luang and nearby areas. Message us on LINE @whd268.

Turn Yearly Recovery Into a Plan You Can Repeat

Book a survey of your riverside home in Sam Khok or nearby areas.

Book Ozone Treatment – Click Here

View Disinfection Service – Click Here

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

Related Links

• Residential ozone disinfection
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• Mosquito spraying service
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Health reference: World Health Organization (WHO): Floods · Department of Health, Thailand