Sala Daeng Road and the late-September 2026 rain: what was reported

There is one report about Sala Daeng specifically, and we present it as published:

• According to Naewna, citing the BMA flood prevention center, at 18:30 on 25 September 2026 Sala Daeng Road at Soi Sala Daeng 1/1 was on the list of waterlogged points on main roads.
• The report did not give a water level, and we found no further report on how long water stayed at this point.

For Bangkok overall, Thai PBS and other outlets reported that rain on 25 to 26 September 2026 peaked at 210.0 mm in Chatuchak, with more than 300 mm in roughly 48 hours. All 50 districts were declared disaster areas on 26 September. Waterlogging points rose from 43 on the evening of 25 September (the list that included Sala Daeng) to 135 on 27 September, and DDPM data on 6 October 2026 put affected Bangkok households at about 329,000. These figures can change.

The timing matters. Half past six is when Silom's office workers pour out of towers toward rail stations, bus stops and restaurants. Street water at that hour touches a very large number of people for a short time, unlike village flooding that touches fewer people for days. So our ranking emphasizes germs carried on feet, shoes and splashes, then tracked indoors.

Flood points around Sala Daeng, and the indoor spots to check

Reported point: Sala Daeng Road at Soi Sala Daeng 1/1, Bang Rak (18:30, 25 September 2026, depth not stated).

Spots worth checking (not reported flood points, but places where street and drain water typically end up):

• Office entrances and ground-floor lobbies where people arrive in wet shoes
• Basement car parks and their ramps, which take street runoff first
• Ground-floor restaurants, cafes and convenience stores with doors level with the sidewalk
• Public and staff toilets, where floor drains may push back in heavy rain
• Back lanes used as refuse points by restaurants
• Door mats, corridor carpets and lift floors that soak up wet shoes all evening

If you manage a building here, think back to that evening: did water enter the entrance, how long did carpets stay wet, and have they been washed or replaced?

Example case: an office worker wading to the train after work

Note: a typical scenario based on common situations after heavy rain in business districts; not a customer statement.

Nat works in accounts in a Silom office tower. On 25 September it rained hard from the afternoon. At home time the road near the soi had water up to the curb, and passing cars sprayed it over the sidewalk. Wearing canvas work shoes, Nat had no choice but to wade to the train, and arrived home with soaked shoes and socks.

The next day Nat noticed a small blister on one heel and realized it had sat in street water all the way. At the office, the housekeeper complained that the carpet in front of the ground-floor lifts was wet and musty, the ground-floor toilet smelled of drains, and two colleagues called in sick with diarrhoea. Nobody knew whether it was linked to the water, but everyone was uneasy.

Nat washed the blister with soap and clean water, covered it and watched for symptoms, ready to see a doctor and mention the wading if fever or calf pain appeared. Building management started asking what to do about carpets, toilets and the car park, the same questions many Silom buildings ask after heavy rain.

How we ranked flood germs for Sala Daeng

This is WHD's editorial ranking, not official data, and not based on case statistics for Bang Rak. Our criteria:

1. Type of water: street water in a business district is rain mixed with drain water that receives restaurant and building wastewater, so sewage germs score high.
2. Exposure pattern: many people touch the water briefly through feet, shoes and splashes, then carry germs inside.
3. Restaurant density: the area is packed with eateries, so foodborne germs get extra weight.
4. Flood guidance: how often WHO, CDC and Thailand's Department of Disease Control mention the germ after floods.
5. Severity, at-risk groups and persistence: described qualitatively only.

A lower rank does not mean harmless, and not every building will have every germ. If you feel unwell, see a doctor. This is not medical advice.

The ranking: 9 flood germs for Sala Daeng and Silom, 2026

No. 1: Street drain bacteria such as E. coli (Escherichia coli) and Shigella

Street water on Sala Daeng is not clean rain. When drains cannot keep up, water mixed with restaurant and building wastewater and road grime rises and blends with rainwater. E. coli indicates faecal contamination, and Shigella causes dysentery and can spread even from a small number of germs. Both travel from contaminated hands to mouths. Where they hide: entrance mats, lobby floors, lift floors, wet shoes and socks, trouser hems and ground-floor shop floors. Symptoms: diarrhoea, cramps, sometimes blood or mucus, and fever; small children and older adults risk dehydration. Prevention: wash hands with soap before eating, wash or replace soaked mats, and wash shoes and socks separately. Spraying's role: both are bacteria, within the group the CHEMGENE HLD4H product information says it covers, but WHD's pages show no specific E. coli or Shigella result; ask WHD if you need test data. WHO and CDC advise cleaning contaminated surfaces first, then disinfecting.

No. 2: Norovirus in restaurants and food stalls

Sala Daeng and Silom are dense with restaurants, both indoors and on the street. When street water splashes into a shopfront, or staff wade through water and then start work, gut germs can reach dishes and food. Norovirus spreads very easily and causes sudden vomiting and diarrhoea, so it ranks high. Where it hides: customer tables, uncovered cutlery, payment counters, door handles and restaurant toilets. Symptoms: vomiting, diarrhoea and cramps, usually brief, but watch for dehydration. Prevention: sick staff stay home, keep dishes in closed cabinets, wash hands often. Spraying's role: norovirus is listed among the organisms the CHEMGENE HLD4H product information says it covers. Spray after closing, washing floors and tables, and removing all food.

No. 3: Leptospira, the cause of leptospirosis, from back lanes behind restaurants

Restaurant districts have refuse points and rats in drains. When heavy rain floods the drains, rats flee and their urine can mix into street water. People wading with foot wounds, like Nat's blister, can be infected through broken skin. The Department of Disease Control warns about leptospirosis after floods every year. Symptoms: sudden high fever, headache, muscle pain especially in the calves, and red eyes; if these appear days to weeks after wading, see a doctor and mention it. Prevention: avoid wading with open wounds, use waterproof plasters, wash feet with soap on arrival, keep rubbish sealed. Spraying's role: Leptospira is a bacterium; WHD shows no specific test, but washing refuse points and back lanes and then disinfecting follows clean-then-disinfect advice. Ask WHD for data.

No. 4: Mold in ground-floor shops and basement car parks, such as Aspergillus and Penicillium

Street water may drain quickly, but if it gets into a ground-floor shop or basement car park that is not dried fast, mold starts on carpets, ceilings, gypsum walls and stock boxes. CDC advises drying wet materials quickly, generally within 24 to 48 hours. Office-building shops often switch off air-conditioning overnight, so damp lingers. Symptoms: congestion, sneezing, coughing and eye irritation; asthma and allergies can flare, and people with weak immunity should avoid heavily moldy rooms. Prevention: lift stock off the floor, remove soaked carpet, run fans and dehumidifiers, do not paint over mold. Spraying's role: the service information says CHEMGENE HLD4H covers fungi; spraying after removal and drying treats residual surface mold, but the moisture source must be fixed.

No. 5: Hepatitis A virus through food and food handlers

Hepatitis A spreads through food or water contaminated with faeces and through food handlers' hands. Where thousands of workers rely on nearby eateries, one contaminated kitchen can reach many customers. The virus is fairly hardy in the environment. Symptoms: tiredness, poor appetite, nausea, yellow skin and eyes, dark urine; adults usually show clearer symptoms than young children. See a doctor if you suspect it. Prevention: handwashing after the toilet and before cooking, clean water, and ask a doctor about vaccination. Spraying's role: it belongs to the virus group the product says it covers, but no hepatitis A-specific result is shown online; ask WHD. Spraying kitchens and toilets after cleaning reduces surface contamination.

No. 6: Klebsiella and Pseudomonas aeruginosa in building toilets and drains

Both thrive in damp drains, basins and slime. When heavy rain leaves water in building drains or forces it back up, ground-floor toilets in offices and restaurants become reservoirs. Healthy people rarely become seriously ill, but older adults, people with wounds and those with weak immunity can be infected. Prevention: scrub drains and basins, flush pipes with clean water, replace soggy sponges and cloths, ventilate. Spraying's role: both are bacteria within the covered group, with no specific test shown online; spraying works best after slime is scrubbed away.

No. 7: Respiratory viruses in office towers and crowded spots: influenza, RSV and SARS-CoV-2

On a stormy evening, Silom workers wait in lobbies, squeeze into lifts and pack station platforms. That helps respiratory viruses spread. They do not come with floodwater, but they follow heavy rain in business districts. Symptoms: fever, cough, sore throat, runny nose, aches; see a doctor if breathing is difficult. Prevention: masks when sick, handwashing, staying home with fever, wiping touch points. Spraying's role: per WHD's service and product information, SARS-CoV-2, RSV, H1N1 and H5N1 are on the covered list, so spraying lobbies, lifts and meeting rooms after cleaning helps.

No. 8: Legionella pneumophila in office cooling towers

Many Silom towers use cooling towers. If heavy rain forces a shutdown or debris enters the system, warm still water can favor Legionella, which spreads by inhaling droplets and can cause pneumonia in older adults, smokers and people with lung disease. Prevention: engineers should inspect and clean cooling towers on schedule and flush idle pipes. Spraying's role: surface spraying does not treat water systems; that needs water-system specialists. Spraying only helps surrounding surfaces such as plant rooms and toilets. No Legionella-specific test is shown online.

No. 9: Staphylococcus aureus and germs entering foot wounds

Pedestrians here wear work shoes not made for wading. Wet skin softens and blisters easily, and skin and environmental bacteria such as Staphylococcus aureus can infect the wound. Wounds contaminated with soil or mud also carry a tetanus (Clostridium tetani) risk, so ask a doctor about vaccination. Prevention: change shoes and socks on arrival, wash and dry feet, cover wounds, and see a doctor if a wound is red, swollen or you have a fever. Spraying's role: it is a bacterium in the covered group with no specific test online; spraying reduces surface germs but does not treat wounds.

Sala Daeng flood germs ranked by type of place

• Office towers: shoe-borne bacteria on lobby carpets, respiratory viruses in lifts and meeting rooms, Legionella in water systems.
• Restaurants and stalls: norovirus, hepatitis A, drain bacteria and rats in back lanes.
• Ground-floor shops: mold in carpets and stock, bacteria from water entering at the door.
• Basement car parks: ramp runoff, mud film, mold on walls and ceilings.
• Condos and rooms on the sois: ground-floor drain backflow, corridor carpets and refuse points.

Why mopping or bleach alone falls short

Ordinary floor cleaners lift dirt and add scent; they are not designed for sewage contamination. Bleach works on some hard surfaces at the right dilution, but can corrode metal, fade carpet and fabric, smells strongly indoors, and must never be mixed with ammonia or acid cleaners. Mops miss wall edges, under shelves and lift door tracks, and wet entrance mats are often just dried and put back. WHO and CDC advise removing mud and dirt, cleaning with water and detergent, drying, and then disinfecting surfaces that touched floodwater. Professional spraying completes that sequence; it never replaces washing.

WHD post-flood disinfection spraying for Sala Daeng and Silom

World Health Disinfection (WHD) is based in Bangkok (Bang Khae, 10160) and offers a disinfection spraying service for offices, shops, restaurants, condos and homes. According to the service information, trained technicians spray and/or ULV-fog (Ultra Low Volume fine mist) with CHEMGENE HLD4H, a medical-grade UK disinfectant containing Benzalkonium Chloride and Didecyldimethylammonium Chloride. The service page calls it broad-spectrum against viruses, bacteria and fungi, lists COVID-19, RSV, H1N1, H5N1 and hand-foot-mouth virus, and claims 99.99%. It cites the Department of Medical Sciences, Mahidol University, NHS England and EN 14476:2013+A2:2019, and lists hospitals, schools, malls, airports, offices, airlines, banks and residential buildings as customers.

WHD serves Bang Rak by appointment, with no branch in Silom and no same-day guarantee. Offices can arrange after-hours or weekend slots subject to the schedule. Call 065-556-6294 or add LINE @whd268.

How it works

1. Survey: where water entered, which carpets got wet, which toilets backed up, where it smells musty.
2. Prepare: housekeeping washes off mud and grime, washes or removes soaked carpet, dries the space and stores food and documents.
3. Zone: people and pets leave each zone during spraying.
4. Spray: floors, lower walls, entrances, lifts, toilets and shared touch points.
5. Re-enter: per the service information, wait about 30 minutes, then use the space normally, following the technician's instructions.

We do not claim zero residue; tell the technician about anyone sensitive. For musty air, the ozone disinfection service can complement spraying. Promotion: a free CHEMGENE spray bottle and WELLGIENIC wet tissues with the service; tax invoices available.

10 reasons Sala Daeng buildings should spray after street flooding

1. Entrances take germs from hundreds of wet shoes at once.
2. Carpets and lobby floors hold moisture and germs longer than expected.
3. Restaurants need confidence before reopening, and the spraying service finishes the job after kitchen cleaning.
4. Lift buttons are touched thousands of times a day.
5. Trained technicians follow the right sequence.
6. A medical-grade UK disinfectant, per the product information.
7. ULV fogging reaches corners mops miss.
8. About 30 minutes before reuse, per the service information.
9. Published certifications and tax invoices. See details.
10. Management can tell tenants that common areas were cleaned and disinfected.

Before and after spraying

Example case: a chicken-rice shop on a Sala Daeng soi

Note: an illustrative scenario, not a customer review.

Aunt Daeng sells chicken rice from a ground-floor shophouse on a soi near Sala Daeng. On the stormy evening, street water splashed up to her shopfront and the drain behind the shop smelled strongly. She closed for a day, washed floors, tables, chairs and cabinet legs with detergent, threw out uncovered side dishes and scrubbed the back drain. Then she booked a spraying team for an agreed date. Everyone left during spraying, with dishes in closed cabinets. After the re-entry time she rinsed prep counters with clean water and reopened the next day, able to answer regulars with confidence.

Checklist for Sala Daeng offices and shops

Before spraying

• Log where water entered and which carpets got wet.
• Wash or replace soaked mats and corridor carpets.
• Wash lobby, shop and ground-floor toilet floors with detergent.
• Scrub slime from drains and basins, then dry with fans and dehumidifiers.
• Discard possibly contaminated food; store dishes and documents.
• Tell tenants and staff the spraying date and time.

After spraying

• Re-enter at the time the technician gives.
• Rinse food-prep surfaces as advised.
• See a doctor for fever, calf pain, diarrhoea or an inflamed wound.
• Recheck damp spots for mold over the next few weeks.

FAQ: flood germs on Sala Daeng Road and in Silom

How deep was the water on Sala Daeng Road? The BMA flood prevention center listed Sala Daeng Road at Soi Sala Daeng 1/1 as a waterlogged point at 18:30 on 25 September 2026, without a depth, so we state none.

I waded briefly after work. Should I worry? Risk is higher with foot wounds. Wash with soap, dry and watch for symptoms; if fever, headache or calf pain appears in the following days or weeks, see a doctor and mention the wading.

Water did not enter our office, but carpets got wet from shoes. Do we need spraying? Wash or replace wet carpet and clean lobby and lift floors. For extra assurance, spraying just the entrance and touch points is an option without treating the whole building.

Does the disinfectant cover every germ here? The product and service information lists COVID-19, RSV, H1N1, norovirus, Salmonella, bacteria in general and fungi. For others such as E. coli, Shigella, Leptospira or hepatitis A, no specific test is shown online; ask WHD.

Can you spray after office hours? Dates and times can be agreed subject to the schedule. WHD has no Silom branch and no same-day guarantee.

The water on Sala Daeng is gone. Let WHD finish the job indoors.

After washing and drying, our technicians can spray entrances, lifts, toilets, shops and touch points.

Book disinfection spraying

Call 065-556-6294 · LINE @whd268

Related services and references

• WHD disinfection spraying service
• WHD ozone disinfection
• Naewna, BMA waterlogging points, 18:30, 25 Sep 2026: naewna.com/n/bkk/81721
• Thai PBS, rainfall 25 to 26 Sep 2026: thaipbs.or.th/news/content/558661
• Thai PBS, waterlogging points 27 Sep 2026: thaipbs.or.th/news/content/558668
• Bangkok Biz News, DDPM figures 6 Oct 2026: bangkokbiznews.com/news/news-update/1255155
• CDC floods: cdc.gov/floods
• WHO fact sheets: who.int/news-room/fact-sheets
• Department of Disease Control: ddc.moph.go.th