A typical scenario (an illustrative example based on common situations, not a review from any specific customer)

A townhouse in Mueang Phitsanulok and a daughter's cough that would not go away

Wanna is a nurse who works rotating shifts. She lives in a two-storey townhouse in a housing estate in Mueang Phitsanulok district with her husband and their nine-year-old daughter, who has allergies. During several days of heavy rain the estate's drains could not cope. Water backed up from the road and came into the house to about a hand-span deep, staying for two full days. The family managed to carry most things upstairs, but the fabric sofa, the floor rug, a plywood shoe cabinet and storage boxes under the stairs all sat in the water.

Once it drained away, everyone swept out the mud, mopped the floor with floor cleaner, threw away the rug and opened every door and window for a breeze. A week later the house looked normal. But Wanna noticed that her daughter had started a dry cough at night, was sneezing every morning and kept rubbing her eyes. A damp smell, like laundry that never quite dried, hung in the living room whenever the air conditioner was turned off. When they pulled the shoe cabinet away from the wall, the back wall and skirting board were covered in grey-green mold.

Working in a hospital, Wanna knew this was not just dirt. It was a source of mold spores that trigger allergies, and there might still be bacteria in the tile grout and under the skirting. The real question was how to make the house genuinely safe again, not just make it look clean.

Phitsanulok Flood 2026: What You Should Know About the Situation

According to DDPM's report dated 1 October 2026, Phitsanulok is on the list of flood-affected provinces. The sources available to us at the time of writing do not give district-level figures for Phitsanulok, so we do not state numbers of households or name specific affected districts, to avoid publishing inaccurate information. Please follow the latest figures from DDPM and the provincial disaster prevention office, as the situation changes every day.

Nationally, DDPM reported on 2 October 2026 that floods had hit 31 provinces plus Bangkok, affecting 1,245,581 households and 3,535,206 people. The cause was heavy to very heavy rain, combined with water from the north flowing down to lower areas. Phitsanulok, in the lower north and on the path of important rivers, therefore needs continued monitoring.

Phitsanulok is often called the "city of two rivers". The Nan River flows straight through the city centre, while to the west the Yom River passes through low-lying areas such as Bang Rakam district, well known for rice fields used to hold water during the flood season. The city itself has detached houses, townhouses in housing estates, student dormitories, condominiums near the universities, shophouses in the commercial districts and the floating raft houses along the Nan River that are a symbol of the city. Further out are farming communities with raised wooden houses and rice barns.

Situation sources: Bangkokbiznews and Thai PBS.

Every Kind of Germ Floodwater Brings to Phitsanulok, and the Symptoms to Watch

Think about the path the water took before it reached your home. Rain fell on roofs and ran onto roads, through drains full of sediment and rubbish, past septic tanks, chicken coops, pig pens and paddy fields, and then seeped under your door. That water brings several groups of microorganisms with it at the same time. To keep things simple, here are five groups.

Group one: bacteria from sewage and faeces

Bacteria such as E. coli, Salmonella and Shigella usually come from toilets and septic tanks that the flood reached. They cause diarrhoea, cramps, watery stools, vomiting and fever. The highest-risk areas are the kitchen, food preparation counters, water storage tanks whose lids went under water and dishes washed in unsafe water. If there are elderly people or young children at home, diarrhoea can lead to dehydration very quickly, so give oral rehydration salts and see a doctor if symptoms do not improve.

Group two: Leptospira, the cause of leptospirosis

In a province like Phitsanulok, where rice fields, grain stores and urban neighbourhoods sit side by side, rats are common. During a flood, rat urine containing Leptospira spreads through water and mud. The bacteria enter the body through cuts, scratches, eyes, nose, mouth or skin softened by long soaking. Early symptoms look like flu, with high fever, chills and headache, but the distinctive sign is severe pain in the calf muscles, sometimes with red eyes. Anyone who waded in floodwater and develops these symptoms within about two weeks must see a doctor immediately and mention the wading, because the disease is treatable when medicine is started early. Ozone treatment of a home cannot treat or prevent infection in the body.

Group three: viruses such as norovirus, rotavirus and hepatitis A

Gut viruses spread through contaminated food and drink and through hands that touch contaminated surfaces. Norovirus stands out because it is highly contagious and tough in the environment; if one person in the house starts vomiting, others often follow within days. Hepatitis A is another infection linked to contaminated water and food, causing fever, fatigue and yellowing of the skin and eyes. In student dormitories and condominiums with shared common areas, viruses spread even more easily.

Group four: mold that thrives on lingering moisture

Molds such as Aspergillus, Penicillium and some black molds grow well on damp plaster, plywood, wallpaper, gypsum ceilings, curtains, mattresses and cardboard boxes. WHO and the CDC recommend cleaning and drying within 24 to 48 hours after a flood to limit mold. But at the end of the rainy season in the lower north, when the air is still humid, getting a house completely dry takes longer than that. Airborne spores trigger allergies, asthma and sinusitis and make people with weak immunity more vulnerable to infection.

Group five: musty and stagnant-water odours

What many households call "flood smell" is a mixture of gases from organic matter decomposing in the mud, odours from drains and volatile compounds released by mold. If the smell remains after cleaning, it is a sign that a source of moisture or microbes is still hiding somewhere in the house.

People who need extra care

Older people who are at home all day, small children who play on the floor, pregnant women, people with chronic conditions such as diabetes, high blood pressure, kidney, heart or lung disease, and bedridden patients. Ideally they should move back in only after cleaning and disinfection are complete, and see a doctor promptly if anything seems wrong.

The Hidden Damage After the Water Recedes in Phitsanulok

Many people measure flood damage by the things they had to throw away. The real cost often arrives in forms you cannot see on day one.

• Health that declines slowly. Allergies, lingering coughs, skin rashes and repeated diarrhoea that mean time off work or school.
• Costs that keep growing. Mold left alone spreads into wooden door frames, built-in cabinets and ceiling frames until whole sets have to be replaced.
• Lost time. Rooms washed again and again because the smell returns, and more trips to the doctor.
• Income for dorms and shops. Tenants near the universities move out because their rooms smell; restaurants and cafés lose customers. Visitors who come to pay respects to the Phra Phuttha Chinnarat image and stroll along the Nan choose places that look cleaner.
• Family strain. Fatigue and worry build up about money, the children's health and whether the water will come again.

Different Buildings in Phitsanulok, Different Weak Spots

Townhouses and housing estates. Water usually enters at floor level, so the trouble concentrates in the bottom metre: skirting boards, the lower part of plaster walls, built-in shoe cabinets, kitchen base units and the space under the stairs. These areas are dark and poorly ventilated, which is why mold often appears there first.

Dormitories and condominiums. Rooms are small and closed for long periods while tenants are out, so humidity builds up quickly. Shared corridors, laundry rooms and ground-floor parking areas can spread smell and spores to several units at once.

Shophouses and restaurants. Stockrooms behind the shop, cold-storage corners and grease traps can hold dirty water and sludge for longer than the shop floor, so check them carefully before treatment.

Raised wooden houses in rural districts. Wood absorbs water and releases it slowly. The open space under the house may stay muddy for days, and rice sacks or tools stored there can attract rats. Dry the wood thoroughly and remove contaminated items before considering any ozone work.

Five Misconceptions That Bring Mold and Odour Back

Misconception one: "I washed it with bleach, so the germs are definitely gone." Bleach only works where it touches directly. It cannot reach into the pores of plaster, wood and fabric, does nothing for germs in the air, and produces dangerous gases if used in a closed room or mixed with other cleaners.

Misconception two: "Leave the air conditioner on and the house will dry." Air conditioning removes some moisture, but if the coil and ducts were exposed to very high humidity, they can collect mold and blow spores around the room.

Misconception three: "Spraying perfume over the smell is enough." Perfumes and air fresheners do not destroy the cause. Once the fragrance fades, the musty smell returns.

Misconception four: "Repainting over mold solves the problem." If the wall is still damp inside, mold keeps growing beneath the paint, causing bubbling, peeling and new stains.

Misconception five: "With ozone, you do not need to wash." This is the most important one. Ozone treatment comes after mud removal, washing and drying. It cannot lift mud or dirt from surfaces.

WHD Ozone Disinfection in Phitsanulok: The Final Step of Home Recovery

Ozone (O3) is a form of oxygen made of three oxygen atoms, with strong oxidising properties. Released into a closed room, it travels wherever air can go: under sofas, behind cabinets, inside drawers, over curtains and into gaps between materials. It breaks down the cell structures of viruses, bacteria and mold and destroys the molecules responsible for odours. Then it decomposes back into oxygen (O2), leaving no chemical residue. According to test results certified for the company by Thailand's Department of Medical Sciences and Intertek (UK), the system eliminates viruses, bacteria and mold by 99.99%.

World Health Disinfection (WHD) is based in Bang Khae district, Bangkok, and has no branch in Phitsanulok. Customers in Mueang Phitsanulok, Bang Rakam, Phrom Phiram, Wang Thong and other districts can contact the team to plan a service. Travel and coverage are confirmed by phone on 065-556-6294 or LINE @whd268. The team schedules a date based on distance and road conditions and does not guarantee same-day arrival.

How the work is done

1. Discuss details and send photos. Tell us the type of building, such as a house, townhouse, dormitory or shop, its floor area and how high the water rose, and send photos via LINE.
2. Check readiness. The building must already be washed and dried. Water-logged materials such as soggy gypsum ceilings should be removed first.
3. Prepare the rooms. Open cupboards, drawers and internal doors; close windows; switch off air conditioners and fans.
4. Everyone and everything living leaves. People, pets and plants must all leave. The room must be empty and closed.
5. Treat zone by zone. Each cycle takes around 30 minutes per zone, adjusted to room size and severity.
6. Rest and ventilate. Wait for the ozone to break down, then air the room before re-entering at the time the team specifies.
7. Aftercare advice. How to control humidity, spot new damp patches and clean the air conditioner.

Safety, once more: Ozone treatment is done only in a closed space with no people, pets or plants inside, and you re-enter only after the rest and ventilation period.

10 Reasons Phitsanulok Residents Choose Ozone After a Flood

1. Whole-room coverage in one go. The gas reaches corners that cloths and sprays miss.
2. Several germ types handled. Viruses, bacteria and mold at 99.99% according to the company's certified test results. Read more on the residential ozone disinfection page.
3. Odour reduced at the source rather than covered up for a few hours.
4. No residue. Suitable for an allergic child's bedroom and for elderly relatives' rooms.
5. Ideal for dorms and condos near the universities. Rooms can be treated one by one and returned to tenants quickly.
6. Ideal for restaurants and cafés in town. It helps owners reopen with confidence.
7. Works for wooden houses. Once the wood is properly dry, ozone helps reduce musty smells soaked into it.
8. Short time per zone. About 30 minutes, so the house does not need to stay closed for days.
9. Verifiable certification. Test documents are published on the company's certificate page.
10. A bonus. Ozone jobs from 15,000 baht come with a free medical-grade disinfectant spray. See conditions on the service page.

Before and After Ozone Compared

Note: results depend on how well the home is prepared before treatment and how humidity is controlled afterwards. Permanently damaged materials should be replaced.

Example Case: A Three-Storey Dormitory in Phitsanulok With Musty Ground-Floor Rooms

Example case (a hypothetical scenario used to explain the process, not a real customer review)

Prasert owns a three-storey dormitory in Mueang Phitsanulok. Most tenants are students and people working in town. Eight ground-floor rooms flooded to about ankle height for two days. Afterwards he hired cleaners to wash the rooms and replaced the mattresses, but two weeks later three tenants reported a musty smell and mold on their plywood wardrobes, and one asked to move out.

Prasert followed a three-stage plan. First, he removed the swollen plywood wardrobes and wiped the walls with cleaning solution. Second, he closed the empty rooms and ran dehumidifiers and fans for several days until the walls were dry. Third, he contacted WHD and sent room photos via LINE to plan ozone treatment for all eight rooms. The team confirmed a travel date and asked the ground-floor tenants to stay out of their rooms during treatment.

The team treated the rooms one at a time, roughly 30 minutes each, then let them rest and ventilate before telling tenants they could return. Tenants who had complained said the smell was much reduced. Prasert also decided to add extra ventilation openings on the ground floor to limit moisture build-up in future.

The takeaway: ozone works best once the source of moisture has been removed, and long-term moisture prevention should be planned alongside it.

A Phitsanulok Home Recovery Plan, Step by Step Over Time

First 72 hours after the water recedes

• Check structural and electrical safety; have an electrician inspect before turning power on.
• Wear boots, rubber gloves and a mask, and cover any wounds before going in.
• Photograph damage for records, then start shovelling mud and removing wet items.
• Discard food, medicine and drinking water that touched floodwater, and clean water tanks before use.

Week one

• Wash floors, walls, furniture and dishes with clean water and detergent.
• Open windows and use fans and dehumidifiers to dry everything as fast as possible.
• Remove ceilings, gypsum walls, insulation and carpets that stay waterlogged.
• Clean air-conditioner filters, or call a technician if units were exposed to water or high humidity.

Weeks two to three

• Confirm that walls and floors are dry and no new damp patches have appeared.
• Contact WHD on 065-556-6294 or LINE @whd268 to plan ozone treatment.
• On treatment day, make sure people, pets and plants are all out of the area.

After ozone

• Re-enter after the rest and ventilation time the team gives.
• Control humidity by opening windows when the sun is out and using dehumidifiers in enclosed rooms.
• Monitor everyone's health. See a doctor for fever, calf pain, diarrhoea or breathing difficulty.

Questions and Answers on Ozone Disinfection in Phitsanulok

Q: Does WHD have a branch in Phitsanulok?
A: No. The company is based in Bang Khae, Bangkok. Customers in Phitsanulok can contact us to plan a service, with travel confirmed by phone on 065-556-6294 or LINE @whd268.

Q: The water was only a hand-span deep. Do I need ozone?
A: It depends on whether there is a musty smell, visible mold or someone with allergies at home. Even shallow water brings germs and dampens the lower walls. Assess after washing and drying.

Q: Will I need to repaint after ozone?
A: Not always. If walls are dry and undamaged, treatment reduces germs and odour. If paint has stained or bubbled, the wall may need repairs once it is fully dry.

Q: How long must we stay out?
A: For the entire treatment and rest period. A cycle is typically about 30 minutes per zone, and the team gives a clear re-entry time.

Q: Is there any smell or chemical left?
A: Ozone decomposes into oxygen, so there is no chemical residue.

Q: Does ozone prevent leptospirosis?
A: It reduces germs in the home but does not prevent or treat disease in the body. If you get a fever or calf pain after wading, see a doctor immediately.

Plan Ozone Disinfection in Phitsanulok With WHD

Whether it is a house, townhouse, dormitory, condominium or shop in Phitsanulok, send us photos of the rooms for assessment, then confirm the travel date by phone or LINE.

Get Ozone Disinfection Advice

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

Related Links and References

• Reducing chemical residue with ozone
• Disinfection service
• Certificates

References

• Bangkokbiznews: flood situation per DDPM reports
• Thai PBS: flood situation report
• CDC: Floods and cleanup
• Thailand Department of Health
• Thailand Department of Disease Control