Is Ko Samui Tap Water Safe To Drink?
No, it's not advisable to drink the tap water.
Tap water in Ko Samui is treated, but it is generally not recommended to drink directly from the tap. Aging pipes, storage tanks, and local distribution conditions can affect water quality.
Use commercially sealed bottled water or water from a properly maintained filter for drinking and brushing your teeth. Tap water is generally suitable for bathing and washing.
Last checked: 2026-10-06
Thailand is ranked as number 98 globally with a score of 51.3% in the water quality EPI research conducted by Yale University.
Source of Water in Ko Samui, Thailand
Tap water in Ko Samui is supplied mainly by the Provincial Waterworks Authority. Its source water comes from local reservoirs, streams, and groundwater wells on the island.
The water is treated at local waterworks facilities before entering the public distribution network. During dry periods, some hotels and homes supplement the public supply with private wells, rainwater, or delivered water.
Ko Samui Drinking Fountains
Public drinking fountains in Ko Samui are not generally considered reliably safe for direct drinking. Water treatment standards may be adequate, but fountain cleanliness, filters, storage tanks, and maintenance can vary.
Use sealed bottled water or water from a well-maintained, regularly serviced filtration dispenser instead. Avoid fountains with unclear maintenance, damaged equipment, unusual taste or odor, or stagnant water.
Drinking Water Map
Here is a map showing all the locations of drinking water spots in Ko Samui. You can click on each water drop to open the spot directly in Google Maps for directions. For easy access on the go, download our iOS app to find water fountains nearby.
About the Author
Hi, I'm Emily Hartman, a researcher and water quality specialist with a background in public health.
I've spent the last few years studying how everyday water systems impact our health, and I'm passionate about making that information clear and useful for everyone.
Safe, clean tap water isn't just my job, it's something I truly care about.