# Can you drink the tap water in South Korea? > Yes, South Korea's tap water is potable. Seoul's Arisu is tested for 350 substances, but locals use filters. What visitors should do in Seoul, Busan and Jeju. - Source: https://clevertourists.com/resources/can-you-drink-tap-water-in-south-korea - Authors: Evan & Clara, Clever Tourists (first-hand, from years of travel across 20 countries) - Published: 2026-07-09 **Yes. Tap water in South Korea is potable.** World Travel Guide says it is safe to drink, though tourists often avoid it because of the taste, and Seoul's city government says its tap water, branded *Arisu*, is tested for 350 substances. The catch is habit: many Koreans filter or buy bottled water anyway, so the choice is yours. We were in South Korea from June to July 2023, in Seoul, Jeonju, Suncheon, Busan, Jeju, Gyeongju and Sokcho, and this page covers the practical details. ## What the city and the guides say The Seoul Metropolitan Government says Arisu is tested for 350 substances, more than national and WHO requirements. An annual city survey of 1,000 adults found 75 percent of Seoul residents drink it, a record high and up 5.4 percentage points on the previous year, reported by the Korea Times in November 2025. The city also acknowledges remaining concern about old residential pipes, and says pipe replacement work is 94 percent complete. Those are the city's own figures. Other sources give lower testing counts, so treat the numbers as the city's claims. World Travel Guide says tap water is potable, but tourists often avoid it because of the taste. The CDC's South Korea page does not give a tap-water verdict and refers to its general advice. ## In restaurants and cafes In almost every Korean restaurant, water is free and self-serve: a cooler or dispenser stands near the door or the kitchen, with metal or plastic cups. You usually fetch your own, and staff will not charge for it. Cafes often provide water or refill stations. This habit is useful because you rarely need to pay for water at meals. Tipping is not expected; see our [Japan and South Korea tipping guide](https://clevertourists.com/resources/tipping-in-japan-and-south-korea-guide). ## Filters, taste and older buildings Most Korean homes and many offices use water purifiers, and tourist apartments often have a filter or a water dispenser. Buildings with older pipes or rooftop tanks may give a metallic or stale taste. Run the tap for a few seconds before filling a bottle. Guides also suggest running the tap for around 30 seconds in older buildings before drinking, which is common sense. If you dislike the taste, buy a bottle or filter. Convenience stores such as GS25, CU and 7-Eleven sell water cheaply, and our [Korea grocery guide](https://clevertourists.com/resources/what-to-buy-at-a-grocery-store-in-south-korea) lists what to buy. ## Seoul, Busan and Jeju Seoul has the most documented guarantee, with the city government's testing and survey results. In Busan and Jeju, tap water is municipal and potable by the same national standard, but we found no city-specific visitor statement, so we rely on the national guidance. In hostels and guesthouses, a water purifier in the kitchen is common. Our [Korea route](https://clevertourists.com/resources/south-korea-itinerary-our-32-day-route-seoul-busan-jeju) follows the order we went. ## Hiking, springs and mountain water Many Korean hiking trails have mountain spring points, often with a sign saying whether the water has been tested. Look for signs that say it is drinkable and avoid streams. If a spring's sign says the water is not suitable for drinking or has failed testing, believe it. Carry your own water on summer hikes, as it is humid and hot. ## Practical kit A refillable bottle is enough. Bring one that fits a standard purifier dispenser. Pair it with the right plug adapter; see our [South Korea plug guide](https://clevertourists.com/resources/south-korea-power-plug-adapter-guide), and our [Korea packing list](https://clevertourists.com/resources/what-to-pack-for-south-korea-packing-list) for other items. For data and connectivity, our [South Korea eSIM guide](https://clevertourists.com/resources/south-korea-esim-for-tourists) covers options. ## Quick checklist before you go Bring a refillable bottle and use restaurant dispensers, hotel filters and convenience-store bottles when you need them. In the summer humidity of July, you will drink more than you expect, and Korea's heat and rain make hiking water especially important. If you are in a hostel or guesthouse, check whether there is a water purifier before buying bottles. If you are staying in an old building, run the tap a few seconds first. Water is rarely a problem for visitors in South Korea, and it is one of the simpler things to get right. ## Water on the road: trains, buses and day trips On long-distance trains and buses, bring a bottle; convenience stores at stations stock water, and vending machines are common. Water coolers in stations, parks and some tourist sites are found, although the taste and temperature vary. On Jeju and in rural areas, shops can be far apart. Carry water for coastal walks and volcanic crater hikes, and use the guesthouse purifier before you leave. Rural bus stops rarely have a shop, so fill up before you leave town. Our [Korea packing list](https://clevertourists.com/resources/what-to-pack-for-south-korea-packing-list) lists other day-trip basics, and our [Korea things to know](https://clevertourists.com/resources/things-to-know-before-visiting-south-korea) page covers the wider practicalities, from transit cards to etiquette. Most visitors find that water is the easiest part of a Korean trip to get right, because a dispenser, a convenience store or a vending machine is almost always within sight. ## Frequently asked questions ### Is Seoul tap water safe to drink? Yes. Seoul's city government says Arisu is tested for 350 substances and a 2025 survey found 75 percent of residents drink it. ### Why do Koreans not drink tap water? Many do, but many prefer filtered or bottled water because of taste and concerns about old pipes. ### Is water free in Korean restaurants? Yes, usually. Restaurants provide free self-serve water, and you fetch it from a cooler or dispenser. ### Can I drink tap water in Busan or Jeju? Tap water is potable nationwide under national standards, but check for filters in guesthouses and run the tap briefly in older buildings. ### Is mountain spring water safe? Only if a sign says it has been tested and is drinkable. Otherwise carry your own water.