Key points at a glance

• Area: Bang Pakok and Rat Burana subdistricts, Rat Burana District, Bangkok.
• 29 Sept 2026: DDPM declared both subdistricts flood assistance zones, hazard starting 25 Sept (Thai PBS).
• No street-level water depths were found, so this article makes no claim of deep flooding.
• The framing is heavy-rain waterlogging, drain backflow and indoor damp.
• The ranking is WHD's editorial view, not an official or statistical ranking.
• Anyone with fever, diarrhoea, a lasting cough or an inflamed wound after water contact should see a doctor.

A typical scenario: the shophouse and the smell from the floor drain

Note: this is an illustrative example based on situations common in urban shophouses during heavy rain. It does not describe any real shop or person in Rat Burana.

Wit runs an appliance repair shop in a three-storey shophouse. The ground floor is the shop and a parts store; the family lives upstairs. On the night the rain would not stop, the road outside drained slowly and water began rising out of the floor drain in the ground-floor bathroom on its own. Wit lifted boxes of parts onto shelves and pushed the water out the back door with a cloth and broom.

By morning the water had mostly dried. But the bathroom floor had a black sediment, the tile grout smelled foul, and the gypsum partition of the store room showed a damp line about a hand-span high. His wife worried about their three-year-old, who loves running around the shop, and his mother, who has asthma, began coughing more whenever she came downstairs.

Wit never had a big flood, but his problem is very common in cities: little water, but very dirty, because it came from the sewer, and moisture left in materials, which invites mold. The family's question was which germs to deal with first, and what spraying could actually do.

Flood points in Rat Burana: what the news report says

We rely on a single fact:

• Bang Pakok and Rat Burana subdistricts, Rat Burana District: Thai PBS reported that DDPM declared them flood assistance zones on 29 September 2026, with the hazard starting 25 September 2026 (source: https://www.thaipbs.or.th/news/content/558867).

The report gives no water levels, no road, soi or village names, and no count of affected homes, so we add none. For conditions in your own street, follow the Rat Burana District Office and the BMA flood control centre, which update continuously.

The wider Bangkok picture

According to Thai PBS and other outlets, rain on 25 and 26 September 2026 exceeded 300 mm in about 48 hours. The BMA declared all 50 districts disaster areas on 26 September. Waterlogged points rose from 43 on the evening of 25 September to 135 on 27 September. On 29 September DDPM listed flood assistance zones in 38 districts and 118 subdistricts, including Bang Pakok and Rat Burana. DDPM data as of 6 October put affected Bangkok households at about 329,000, and Daily News reported DDPM figures at 06:00 on 5 October 2026 showing 26 provinces plus Bangkok affected, 1,270,151 households in total. These are broad figures and say nothing specific about Rat Burana.

So for residents here, the first risk to picture is not thick mud from a mountain flash flood. It is water pooling on roads and in sois during heavy rain, sewer water backing up into bathrooms and drains, and damp lingering in walls, floors and furniture of buildings closed for days.

How we ranked post-flood germs for Rat Burana

This is WHD's editorial ranking. It is not official, not based on case numbers in Rat Burana, and does not imply any outbreak. Our criteria:

1. Link to floods and sewage in WHO, CDC and Department of Disease Control guidance.
2. Fit with urban flooding: shallow but sewage-tainted water, drain backflow and indoor damp, rather than deep, long-lasting water.
3. Ability to live in water systems and damp places such as pipes, tanks and absorbent materials, described qualitatively without unsourced numbers.
4. Severity and risk groups, especially small children, older adults, people with lung disease or asthma, and people with weak immunity.
5. Relevance to workplaces and shops, since city districts mix homes, shophouses, restaurants and businesses.

The order is tuned to urban waterlogging, so it differs from our riverside and mountain rankings, and it is no substitute for a doctor's diagnosis.

Top 10 post-flood germs for Rat Burana homes, shophouses and shops

1. Sewage bacteria from drain backflow (Escherichia coli and Enterococcus)

Why first: when public drains cannot take the rain, sewer water pushes back into homes through bathroom floor drains, kitchen gutters and rear outlets. This is not clean rainwater; it has passed through the wastewater pipes of the whole soi. E. coli and Enterococcus are used as indicators of faecal contamination, and even a few centimetres of backflow can leave them in the residue.

Where they hide: bathroom floors, grout lines, drain rims, chair legs, ground-floor door sills, doormats and shoes.

Symptoms: diarrhoea, cramps and nausea. Crawling toddlers are most exposed. Bloody stools or severe weakness need a doctor.

Prevention: wear rubber gloves when mopping backflow, discard wet doormats, wash floors with detergent working from clean areas toward dirty ones, and wash hands afterwards.

Spraying: after washing, spraying bathroom floors, drain surrounds and ground floors helps reduce what remains. Neither organism is named on the website, but both belong to the bacteria group the product says it covers; ask us for organism-specific test documents.

2. Pseudomonas aeruginosa, the drain dweller

Why: Pseudomonas thrives in wet places such as drains, sinks, shower heads and sponges. Backflow and long-wet floors give it an advantage, and it ties directly to the main feature of urban flooding.

Where it hides: floor drain grates, under-sink pipes, sponges, cloths, buckets and shower heads.

Symptoms: infected wounds, rashes after water contact and outer ear infections; more serious in bedridden or immunocompromised people.

Prevention: replace all sponges and cloths, remove and scrub drain grates, tip out standing water and keep bathrooms dry.

Spraying: bacteria group, no specific result online. Spraying around drains after scrubbing reduces reservoirs.

3. Mold in gypsum, plywood and carpet (Stachybotrys, Penicillium)

Why: shophouses and offices often use gypsum partitions, plywood cabinets and carpet. These wick up water even from shallow flooding and dry poorly in rooms kept shut. Black mold such as Stachybotrys favours cellulose materials that stay wet. WHO and CDC advise drying within 24 to 48 hours.

Where it hides: lower gypsum walls, behind plywood units, under carpet, document boxes and leaking ceiling panels.

Symptoms: cough, sneezing, blocked nose, asthma flare-ups and eye or skin irritation. Older people with lung disease should avoid moldy rooms.

Prevention: cut out wet gypsum as a builder advises, discard soaked carpet and cardboard, ventilate, use a dehumidifier if available, and wear a mask while removing materials.

Spraying: according to the service information, the product covers fungi, but spraying does not replace removing deeply moldy materials. Spray after removal, washing and drying. For musty closed rooms, consider our residential ozone disinfection as an add-on.

4. Legionella in idle water systems

Why: Legionella grows in warm, stagnant water: storage tanks, pipes unused for days, cooling towers and shower heads. People are infected by breathing in contaminated droplets. CDC advises that buildings closed or with low water use check and flush their systems before reopening. We rank it fourth for a city district where shops and businesses may have been shut for several days.

Where it hides: rooftop tanks, pumps, unused pipes, shower heads and large air-conditioning systems.

Symptoms: fever, cough, breathlessness and muscle aches, sometimes pneumonia. Older adults, smokers and people with chronic illness face higher risk and should see a doctor.

Prevention: run taps and showers to flush stale water, clean storage tanks, and have the building's cooling system checked.

Spraying: surface spraying does not disinfect pipework or cooling towers; that is a job for water-system technicians. We include it so it is not overlooked. Legionella sits in the bacteria group with no specific result online.

5. Salmonella and Campylobacter in kitchens and restaurants

Why: made-to-order eateries, chicken rice shops and home kitchens hit by backflow may hold chicken and eggs that were not kept cold during power cuts. Both germs often come with raw poultry and spread to boards and knives.

Where they hide: chopping boards, knives, prep sinks, fridges that lost power and kitchen floors where water came up.

Symptoms: diarrhoea, cramping, fever and nausea, sometimes bloody stools; see a doctor if severe.

Prevention: discard doubtful ingredients, cook thoroughly, separate raw and cooked boards and clean fridges before restocking.

Spraying: according to the product information, Salmonella is listed as covered; Campylobacter belongs to the general bacteria group. Spraying kitchens after washing suits shops about to reopen, with food-contact surfaces rinsed as the technician advises.

6. Norovirus in workplaces and multi-generation homes

Why: after waterlogging, staff and family clean together, share one bathroom and eat together. Norovirus spreads easily through hands and surfaces.

Where it hides: flush handles, taps, door knobs, water coolers and dining tables.

Symptoms: vomiting, diarrhoea and stomach pain; sip rehydration salts and see a doctor if not improving.

Prevention: wash hands with soap, keep sick staff away from food work, and clean vomit wearing gloves.

Spraying: according to the product information, norovirus is listed as covered, so bathrooms and shared touch points in shops and offices are good targets.

7. Leptospira (leptospirosis)

Why: city sewer rats surface when drains fill, and their urine mixes into pooled water. We rank it seventh, lower than in riverside articles, because there is no report of water deep enough here to require long wading, but the risk still matters.

Where it hides: back alleys, storerooms, rubbish points and puddles.

Symptoms: high fever, headache, calf pain and red eyes; tell your doctor if you waded through water.

Prevention: never walk barefoot in floodwater, cover wounds and use lidded bins.

Spraying: bacteria group, no specific result online; spraying washed floors reduces contact.

8. Klebsiella and other wastewater bacteria

Why: Klebsiella lives in the gut and in wastewater and can cause illness in vulnerable people, such as bedridden patients or those with urinary catheters. Homes caring for such patients should be especially careful about backflow.

Where it hides: bathroom floors, the edges of a ground-floor patient bed, bedpans and care equipment.

Symptoms: fever, painful urination and productive cough; at-risk patients with fever need a doctor promptly.

Prevention: move the patient upstairs during cleaning, wash hands before and after care, and clean any equipment that touched water.

Spraying: bacteria group, no specific result online. Tell our team about bedridden patients so we can plan spraying and waiting times.

9. COVID-19 and influenza in reopening shops and offices

Why: when shops and offices reopen together, many customers and staff enter closed, still-damp spaces, and respiratory viruses spread through droplets and surfaces.

Where they hide: counters, card machines, lift buttons, stair rails and meeting tables.

Symptoms: fever, cough, sore throat and fatigue; older people and those with chronic illness should see a doctor.

Prevention: ventilate, mask when sick and let sick staff stay home.

Spraying: according to the service information, the product covers COVID-19, influenza H1N1, H5N1 and RSV, which suits pre-opening spraying after cleaning.

10. Staphylococcus aureus and wounds from clearing out

Why: cutting gypsum, moving cabinets and carrying stock cause frequent scratches, and Staphylococcus on the skin can inflame them. It ranks last because good wound care prevents most problems; deep nail or metal wounds also warrant asking a doctor about tetanus vaccination.

Where it hides: shared towels, damp work gloves and high-touch surfaces.

Symptoms: red, swollen, painful wounds with pus; fever needs a doctor.

Prevention: wear thick gloves, wash wounds with clean water and soap, and keep dressings dry.

Spraying: bacteria group the product covers, no specific result online. Spraying touch points helps, but wound care matters most.

Shallow water does not mean low risk

Many city residents assume ankle-deep water is no big deal. What makes urban waterlogging worrying is its source: water forced up from floor drains has passed through the wastewater systems of many buildings, and when it dries it leaves a thin, barely visible film on floors and lower walls. Moisture inside materials is the other blind spot. A gypsum wall that looks dry outside may still be damp inside and become a mold source within days. That is why our Rat Burana ranking weights drain germs and building mold over the soil germs that dominate rural flash floods.

Why ordinary floor cleaner may not be enough

• Floor cleaners focus on shine and scent, not on killing sewage germs. A pleasant smell can mask drain odour without meaning germs are gone.
• Bleach must be used properly: diluted as the label says, applied to washed surfaces and never mixed with ammonia or some toilet cleaners.
• Grout and drain rims hold built-up grime that must be scrubbed away before any disinfectant can reach the surface.
• Shops in a hurry to reopen often clean the front and skip store rooms and staff bathrooms.

CDC and the Department of Disease Control recommend the same order: remove water, scrub, wash, dry, then disinfect surfaces that touched floodwater. That final step is where spraying helps.

WHD's post-flood disinfection spraying for Rat Burana

World Health Disinfection (WHD) is based in Bang Khae, Bangkok 10160, with no branch in Rat Burana. Book at 065-556-6294 or LINE @whd268 and we will confirm a date according to our schedule; we do not promise same-day visits. Shops and offices can request a time outside opening hours.

According to the service information, trained technicians spray and/or ULV-fog (Ultra Low Volume fine mist) with CHEMGENE HLD4H, a UK medical-grade disinfectant containing Benzalkonium Chloride and Didecyldimethylammonium Chloride. The page lists viruses, bacteria and fungi including COVID-19, RSV, H1N1, H5N1 and hand-foot-mouth virus, claims 99.99%, and lists approvals or endorsements from the Department of Medical Sciences, Mahidol University, NHS England and EN 14476:2013+A2:2019. Customers include hospitals, schools, malls, airports, offices, airlines, banks and residential buildings. The product is described as broad-spectrum; we state no strain count, and test documents for organisms not named on the pages are available on request.

Service steps for homes and shops

1. Survey: tell us where backflow came in and how many bathrooms, kitchens, store rooms or wet gypsum walls are involved; send photos on LINE.
2. Clean and strip first: remove water, scrub residue, cut out moldy materials and dry. Spraying works only on clean surfaces.
3. Zoning: store food, stock, dishes and toys; people, customers and pets leave the zone.
4. Spraying: focus on bathrooms, drain surrounds, kitchens, ground floors, counters and shared touch points.
5. Wait before use: according to the service information, wait about 30 minutes, then use the space normally, following the technician's stated time.

We do not claim there is no residue at all; rinse or wipe food-contact surfaces as advised. According to the service information, customers receive a free CHEMGENE spray bottle and WELLGIENIC wet tissues, and a tax invoice is available, which is handy for shops and companies.

10 reasons Rat Burana homes and shops spray after cleaning

1. Drain backflow is sewage, and even shallow water leaves germs behind.
2. Bathrooms, kitchens and drain rims are hard to clean thoroughly by hand.
3. Our disinfection spraying service uses a product listed for viruses, bacteria and fungi.
4. Restaurants reopen with more confidence after kitchens are washed.
5. Offices and shops treat shared touch points before staff and customers return.
6. Homes with bedridden or elderly members get a tailored plan.
7. Trained technicians zone each space and state a clear waiting time.
8. Bookings outside opening hours are possible, subject to schedule.
9. Tax invoices and certificates are available via our post-flood spraying page.
10. Easy contact on LINE @whd268 with photo assessment.

Before and after

Example case: a small office closed for four days

Note: an illustrative example to explain the process, not a real customer review.

Prae manages a small accounting office in a shophouse. During the heavy rain, staff worked from home for four days. On return they found that water had backed up into the ground-floor bathroom, the carpet outside it smelled, and document boxes on the floor were wet at the base. Prae had the carpet thrown out, documents moved up, the bathroom and floors scrubbed, and every tap run to flush stale water. Then she booked spraying for Friday evening after work, and staff returned on Monday. What impressed her was the technician saying plainly that spraying helps surfaces but does not replace removing moldy carpet, and does not disinfect pipes or water tanks.

Recovery checklist

• Cut power to wet areas and have an electrician check before use.
• Wear gloves, boots and a mask; scrub bathrooms, grout and drain grates.
• Discard wet carpet, sponges, cloths and cardboard; cut out damp gypsum.
• Flush taps and showers, clean water tanks, and clean out fridges.
• Send photos, book spraying once clean and dry, leave the zone and return on time.
• Watch for fever, cough, diarrhoea and inflamed wounds.

FAQ

How deep was the water in Bang Pakok and Rat Burana? The report we cite says DDPM declared both subdistricts assistance zones on 29 Sept 2026, hazard from 25 Sept, but we found no street-level depths, so we state none.

Only a few centimetres of water came in. Is spraying needed? It depends on the source. Backflow into bathrooms or kitchens warrants washing and considering spraying; a little rain on a balcony may only need washing and drying.

Does spraying deal with Legionella in water tanks? No. It is surface disinfection; water systems need a water-system technician.

Is this ranking official? No. It is WHD's editorial ranking.

Do you have a Rat Burana branch? No. We are based in Bang Khae and travel by appointment.

Drain backflow cleaned up? Let us spray it

Book Disinfection Spraying

Call 065-556-6294 | LINE @whd268

References

• Thai PBS, flood assistance zones, 29 Sept 2026: https://www.thaipbs.or.th/news/content/558867
• Daily News, DDPM 5 Oct 2026: https://www.dailynews.co.th/news/6249374/
• CDC Floods: https://www.cdc.gov/floods/ ; WHO: https://www.who.int/news-room/fact-sheets ; DDC: https://ddc.moph.go.th/