A typical scenario (an illustrative example, not a real customer)

A Three-Generation Timber Grocery and a Smell That Would Not Leave

Leng runs a grocery store in a two-storey timber shophouse in Chum Saeng's market quarter. The shop has been in the family since his grandfather's time. The ground floor is packed with wooden shelves of fish sauce, rice, snacks, washing powder, plastic bags and wrapping paper. Upstairs are the bedrooms of Leng, his wife and his grandmother, who is nearly ninety.

When heavy rain kept falling and the Nan River rose, water began entering the market quarter. Leng and his son lifted rice sacks and boxes of stock up high, but the bottom shelves, an old wooden document cabinet and the shop's worn floorboards stayed underwater for days. Grandmother was taken to stay with a grandchild in Nakhon Sawan town.

After the water receded, the family shovelled out the mud, threw away wet stock, washed the floor and shelves and opened the folding steel door every day. Two weeks later, the shop still smelled musty, mixed with rotten mud. Some customers grimaced as they walked in, and newly shelved snacks seemed to pick up the smell. Grey-green mold spread in a sheet behind the wooden cabinet. Leng's wife developed allergies and a night-time cough, and Leng did not dare bring his grandmother home for fear she would fall seriously ill.

This happens in old timber shophouses in riverside towns everywhere. Timber that has been dry for decades releases absorbed water very slowly and becomes prime mold habitat, while paper, fabric and dry food goods absorb odours easily. Washing with water alone is not enough.

Where the Flooding Hit in Chum Saeng: The Confirmed Facts

• According to the DDPM report of 2 October 2026, Chum Saeng was among 14 flooded districts in Nakhon Sawan. The province had 11,928 affected households, and water levels were rising.
• The 11,928 figure covers the whole province. No district-level figure was published for Chum Saeng, so this article does not say how many homes flooded there or which subdistrict was worst hit.
• Nationally, the DDPM reported on 2 October 2026 flooding in 31 provinces plus Bangkok, affecting 1,245,581 households and 3,535,206 people, caused by heavy to very heavy rain combined with northern runoff.

Figures change daily. Chum Saeng residents should follow announcements from the district office, the municipality, the subdistrict administrative organisations and the Nakhon Sawan DDPM office closely, especially while levels are still rising.

Why "Water Levels Rising" Matters for Recovery

The DDPM note that levels were still rising matters for anyone planning a cleanup. Buildings that stand in water for a week or more absorb far more moisture than those flooded for a day or two. Old timber becomes saturated, plaster walls wick water upward and gypsum ceilings can sag. That means drying will take longer than many people expect, and mold will have more time to take hold. It also means the best time to plan recovery, including who will remove mud, where damaged stock will go and when a disinfection visit makes sense, is while the water is still high, so the work can begin as soon as it is safe.

What Kind of Town Chum Saeng Is, and Why Recovery Must Fit the Place

Chum Saeng lies on the Nan River, upstream of where the Nan meets the Ping to form the Chao Phraya at Pak Nam Pho. Homes in the district vary widely:

• Timber shophouses and old buildings in the market quarter. Shop downstairs, home upstairs, with wooden floors, wooden walls and ceilings that have gathered dust for years. Moisture climbs to the upper floor through the timber.
• Nan riverside homes and stilt houses. The space underneath holds boats, fishing gear and household items, and collects mud and plant debris after long flooding.
• Farmhouses in the fields. Rice stores and sheds for harvesters and water pumps become odour and mold sources when wet.
• Concrete houses and rental rooms. Plaster walls, gypsum ceilings and particleboard furniture absorb moisture and grow mold within days.

Every Germ That Chum Saeng Floodwater Brings: Know It to Prevent It

Flooding in a market town differs from flooding in open fields: within a short distance, water passes drains, septic tanks, eateries, meat stalls and rubbish heaps, so sewage-borne germs are concentrated. Homes in the fields face risks from field rats and livestock. Here is what to know.

Sewage Bacteria: E. coli and Salmonella

E. coli signals faecal contamination, and Salmonella is found in sewage and raw meat. Both cling to counters, shelves, chopping boards and containers, causing food poisoning, diarrhoea, vomiting, stomach pain and fever. Restaurants and food sellers in Chum Saeng's market must thoroughly wash and disinfect food-contact surfaces before reopening.

Leptospirosis in the Market and the Fields

Fresh markets and storerooms house rats. When floods come, rat urine carrying Leptospira spreads into standing water and mud. People who wade to move stock or clean shops without boots, or with foot wounds, are at risk. The symptoms to remember are sudden high fever, headache and calf pain. If they appear within one to two weeks of wading, go to a hospital or clinic promptly and tell the doctor you waded through floodwater.

Viruses That Spread When People Crowd Together

During floods, families crowd onto the upper floor of shophouses or stay in shelters and with relatives. Norovirus and rotavirus spread easily via hands and surfaces, causing diarrhoea and vomiting. Influenza and RSV spread by droplets in closed rooms and are dangerous for older people like Leng's grandmother and for young children.

Mold in Old Timber, Ceilings and Shop Stock

Mold starts growing within 24 to 48 hours of materials getting wet, which is why WHO and CDC advise cleaning and drying within that window. High-risk spots in Chum Saeng's timber shophouses include the back of wooden cabinets, under shelves, floorboard joints, ceilings that wicked up water and stacked cardboard boxes. Spores cause allergies, coughing, sneezing and itchy eyes and can trigger asthma. Older people and those with chronic lung disease are especially vulnerable.

Musty, Mud and Drain Smells in the Shop

Post-flood shop smells come from volatile compounds that bacteria and mold release while breaking down organic debris in mud, wood and wet stock. They taint new goods and make customers feel the shop is dirty even when the floor is gleaming.

At-risk groups: older people, young children, pregnant women and people with diabetes, high blood pressure, kidney or lung disease or allergies should return only after the home is dry and disinfected. Fever, calf pain, severe diarrhoea or breathing difficulty means seeing a doctor immediately.

What Chum Saeng Loses When the Smell Stays

The health of elders in an old town. Many older people live in Chum Saeng's old houses while their children work elsewhere. A home that still harbours mold and mustiness raises their risk of respiratory illness.

Shop income. A market shop already closed for days loses customers to competitors if it still smells when it reopens. Tainted stock must be discounted or thrown away, and income is lost a second time.

Spiralling repair bills. Wall panels and floors left to mold may need full replacement; moldy ceilings must be redone; particleboard furniture must go. The longer it waits, the more it costs.

Everyone's time. Sons and daughters who come back from Bangkok or other provinces to help have limited leave. If the cleanup is done the wrong way and has to be repeated, the whole family loses more days and more energy, often just as the rice fields around town also need attention.

The value of an old home. Timber shophouses in the market quarter hold family and town memories. Drying and cleaning old timber properly helps preserve them for the next generation.

Myths That Keep Chum Saeng Homes and Shops Smelling

Myth: "Strong bleach and it's done."
Fact: Bleach kills germs on smooth surfaces, but old timber is highly porous, so bleach does not reach mold roots. It also stains wood and gives off fumes that irritate older lungs. Never mix it with toilet cleaners or ammonia, which produces dangerous gases.

Myth: "A week of fans will dry it out."
Fact: Fans dry the surface while the inner wood stays damp. In humid, rainy weather moisture drops very slowly, and the airflow spreads mold spores around the shop.

Myth: "Perfume and incense will clear the smell."
Fact: They mask it temporarily. The source remains, and perfume mixed with mustiness puts customers off even more.

Myth: "Paint over the mold and it's like new."
Fact: Mold keeps growing under paint, which soon bubbles and peels, so the job must be redone.

Myth: "Restock as fast as possible."
Fact: In a damp, smelly shop, new stock picks up the smell and may grow mold. Dry and disinfect first, then restock.

What Chum Saeng's timber shophouses need is washing, genuine drying, then disinfection that reaches both the air and every crevice, which is what ozone does well.

WHD Ozone Disinfection After the Flood in Chum Saeng

World Health Disinfection (WHD) offers a residential and building ozone disinfection service for homes, condos, shops, offices, factories, schools and other buildings. Ozone (O3) is a strongly oxidising gas that breaks down bacterial cell walls, viral envelopes and mold cells and splits odour molecules, then reverts to oxygen (O2), leaving no chemical residue on stock, mattresses or belongings.

According to the test results the company has had certified by Thailand's Department of Medical Sciences and Intertek (UK), WHD's ozone system eliminates viruses, bacteria and mold at up to 99.99%. See also the ozone cleaning service.

Service Steps

1. Initial assessment. Send photos of the shop or home, floor area, number of storeys and spots with odour or mold via 065-556-6294 or LINE @whd268. WHD is based in Bang Khae, Bangkok, with no branch in Nakhon Sawan. Travel to Chum Saeng, dates and fees are confirmed by phone or LINE; same-day arrival is not promised.
2. Preparation. People, pets and plants leave the area. Doors and windows are closed; cupboards, drawers and storage boxes opened.
3. Ozone release. The generator is set up and gas released according to area. A two-storey shophouse is usually split into ground-floor and upper-floor zones.
4. Contact time. Ozone works on germs in the air, on surfaces and in crevices; a typical cycle is about 30 minutes per zone.
5. Rest and ventilation. Wait for the ozone to revert to oxygen, air the space, then re-enter when the team says so.

Safety first: ozone is applied only in an empty, sealed space. No people, pets or plants during treatment; re-entry only after rest and ventilation. Ozone follows mud removal, washing and drying. It does not replace cleaning, repairing rotten timber or medical treatment.

10 Reasons Timber Shophouses and Nan Riverside Homes in Chum Saeng Should Use Ozone

1. Old timber has countless crevices, and gas reaches them all: floorboard joints, behind cabinets, under shelves and ceilings.
2. It covers viruses, bacteria and mold, up to 99.99% per the company's certified tests.
3. It removes mud and drain smells from the shop by destroying odour molecules, so customers stop grimacing at the door.
4. No chemicals left on stock or shelves, because ozone becomes oxygen.
5. It readies rooms for elders to come home by reducing mold and airborne spores upstairs.
6. It reduces smells in wardrobes, curtains and mattresses that are kept after washing and drying.
7. It suits shops and rental rooms that need to reopen quickly. See service details.
8. About 30 minutes per zone, floor by floor, without closing for days.
9. Tested to a standard by the Department of Medical Sciences and Intertek, as certified by the company.
10. Lower long-term costs. Less chance of replacing timber or repainting twice, and jobs from 15,000 baht include a free medical-grade disinfectant spray. Ask about the promotion.

Before and After in a Chum Saeng Timber Shophouse

Rotten timber or sagging ceilings must be repaired first, and leaks fixed, or moisture will bring mold back.

Example Case: Monthly Rental Rooms Near Chum Saeng Railway Station

Example case (a typical illustrative scenario, not a real customer review)

Wilai owns eight single-storey monthly rental rooms in a neighbourhood not far from Chum Saeng railway station. Most tenants work locally or are students from outlying subdistricts. When floodwater entered the lane, every room took in water close to knee height, and tenants moved to relatives' homes for a while.

After the water receded, Wilai hired neighbours to shovel out the mud, threw away swollen mattresses and particleboard wardrobes, washed tiled floors and walls and left every door and window open for more than ten days. Yet several tenants who came back to look said the rooms still smelled musty, and some had mold along the bottom of walls and in bathroom corners. One tenant family with a small child was unsure whether to stay.

Wilai contacted WHD on LINE with the room layout, sizes and photos of the mold. The team advised wiping off visible mold, fixing a leaking bathroom pipe and letting the walls dry further, then agreed the travel date and price. On the day, every room was empty of tenants and pets. The team treated one room at a time, rested and ventilated each for the set period, then handed them back.

Tenants moved back in, the mustiness clearly reduced, and the family with the child decided to stay. Wilai still asks every tenant to open windows daily and tell her at once if new damp appears, because ozone handles germs and odour while keeping a building dry is ongoing work.

Chum Saeng Home and Shop Flood Recovery Checklist

Safety Before You Start

• Enter only when authorities say it is safe. Check floorboards, stairs and ceilings for rot, sagging or trapped water above.
• Switch off at the breaker. Have an electrician check sockets, wiring, display fridges and pumps that were submerged.
• Wear boots, rubber gloves and a mask; cover wounds.
• Watch for snakes, centipedes and other venomous creatures among stock and behind cabinets.

Wash and Dry

• Shovel mud from the shop floor, under shelves and under the house.
• Discard food, medicines and cosmetics that touched floodwater, plus swollen cardboard and particleboard. Photograph them for assistance claims.
• Wash surfaces, shelves and counters with clean water and detergent, then wipe with disinfectant as labelled; never mix chemicals.
• Thoroughly clean chopping boards, containers and kitchen equipment in food shops.
• Open doors and windows, use fans to push damp air outside and a dehumidifier if available, until timber and walls are truly dry.

Ozone Day

• Everyone, pets and plants out; doors and windows sealed.
• Open cupboards, drawers and storage boxes.
• Re-enter after the full rest and ventilation period.

Afterwards

• Restock only once the shop is dry and disinfected.
• Ventilate daily and check former mold spots.
• Watch everyone's health; fever, calf pain, diarrhoea or breathing trouble means a doctor.

FAQ: Ozone Disinfection After the Flood in Chum Saeng, Nakhon Sawan

Q: Does WHD have a branch in Nakhon Sawan or Chum Saeng?
A: No. WHD is in Bang Khae, Bangkok. Contact 065-556-6294 or LINE @whd268 to plan service in Chum Saeng, with travel and dates confirmed in advance.

Q: Can an old timber shophouse be treated?
A: Yes, once the timber is properly dry. Check long-soaked timber first; repair anything rotten or badly swollen.

Q: Do we need to remove shop stock?
A: Food, medicines and goods that touched floodwater must be discarded. For dry stock, discuss arrangements with the team. The space must be free of people, pets and plants.

Q: How long does it take?
A: A typical cycle is about 30 minutes per zone plus rest and ventilation. A two-storey shophouse is usually at least two zones.

Q: Will the smell come back?
A: If moisture sources remain, such as a leaking roof or pipe or damp timber, mold can return. Dry out and fix the cause first, and keep ventilating afterwards.

Q: Can ozone replace seeing a doctor?
A: No. Ozone disinfects spaces; it does not treat illness. Anyone with symptoms must see a doctor.

Q: Any promotion?
A: Ozone jobs from 15,000 baht receive a free medical-grade disinfectant spray.

Plan Ozone Disinfection for Your Home or Shop in Chum Saeng

Send photos, floor area and the spots with odour or mold to the WHD team for an assessment, then book once the space is dry.

See the Ozone Disinfection Service

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

Related Services and Links

• Building disinfection service
• Chemgene disinfectant
• Certificates and test reports

References

• Bangkokbiznews: DDPM flood report (2 Oct 2026)
• Thai PBS: flood situation coverage
• Khaosod English: people affected by floods across Thailand
• CDC: Floods and cleanup
• WHO fact sheets