The Short Answer
No. Don't drink tap water anywhere in Indonesia, including in five-star hotels in Bali or serviced apartments in Jakarta. This isn't a matter of getting an upset stomach for a day — Indonesia's municipal water systems aren't treated to a standard that's safe for a foreign digestive system, and in a lot of neighborhoods the pipes themselves are old enough to reintroduce contamination after treatment. Locals don't drink it straight from the tap either. Most Indonesian households boil their water or run it through a filter before they'll touch it, and that's after growing up with the local bacteria already in their systems.
The good news is that staying safe is easy once you know the routine. It just takes a few habits that aren't obvious until someone tells you.
Why the Tap Isn't Safe
Indonesia's water infrastructure varies wildly by city and neighborhood, but the underlying problem is consistent: treatment plants don't reliably remove all pathogens, and the distribution network is old enough in most cities that water can pick up contamination between the plant and your tap. In Jakarta specifically, large parts of the city sit below sea level and are still sinking, which lets seawater and sewage intrude into groundwater and pipe networks during heavy rain — and heavy rain is most of the year.
It's not just bacteria. Runoff carries heavy metals and industrial waste into rivers that feed municipal systems in some regions, and testing and enforcement aren't consistent enough for a traveler to gamble on any one tap being the exception. Even where the water leaves the treatment plant clean, it often travels through pipes that were laid decades ago, in buildings with rooftop tanks that don't get cleaned on any schedule.
None of this means Indonesia is uniquely dangerous. It means the tap water here sits in the same category as most of Southeast Asia: fine for washing and bathing, not for drinking.
Bottled Water: What to Buy and the Refill Scam to Watch For
Bottled water (air mineral) is sold everywhere — minimarkets, warungs, hotel lobbies, street stalls — and it's cheap. A large bottle from a minimarket costs a fraction of what you'd pay at a hotel restaurant, so stock up at an Indomaret or Alfamart rather than relying on the minibar.
The one thing worth knowing: refilled bottle scams are real, though not common at legitimate stores. Someone occasionally refills a used name-brand bottle with tap water and reseals it for resale, usually at roadside stalls or from vendors who approach tourists directly rather than at a fixed shop. Before you drink, check that the plastic tamper ring at the neck is still intact and that the cap doesn't twist off too easily. A slightly crooked label, a seal that looks re-glued, or water that tastes faintly of chlorine or plastic are all reasons to just buy a different bottle. Buying from a shelf inside a real store, rather than a bucket of loose bottles on a curb, avoids the problem almost entirely.
Ice, Teeth-Brushing, and the Gray Areas
Ice in drinks: Ice at any established restaurant, cafe, or hotel bar in Indonesia's tourist areas is almost always made from filtered or boiled water — commercial ice production here uses treated water because restaurants can't risk sickening customers any more than you can risk drinking it. The ice to be cautious about is at very small, informal roadside stalls where you can't tell where it came from. If the ice looks cloudy, has visible sediment, or comes in irregular chunks rather than the uniform cylinders or cubes that commercial ice makers produce, skip the cold drink and ask for something warm instead.
Brushing your teeth: This is genuinely fine with tap water for the vast majority of travelers — you're not swallowing meaningful quantities, and rinsing your toothbrush under the tap won't make you sick. If you have a sensitive stomach or you're traveling with young kids, keep a bottle by the sink and use that instead. It costs nothing extra and removes one more thing to think about.
Washing fruit and vegetables: Safe to wash tap water off produce as long as you're going to peel it or cook it afterward. Don't eat anything rinsed in tap water that you're going to eat with the skin on, like whole cherry tomatoes or unpeeled cucumber, unless a restaurant you trust is doing the washing with filtered water — which most tourist-facing restaurants do.
Showering: Completely fine. Skin contact isn't the risk; swallowing is.
Refill Stations: The Alternative to Buying Plastic
If you're staying more than a few days, especially in Bali, you'll notice refill stations (depot air minum isi ulang) on almost every street corner. These are small shops that sell filtered, treated water by the liter into your own container, usually far cheaper than buying individual bottles and with a fraction of the plastic waste. Many villas and guesthouses in Canggu, Ubud, and Seminyak now provide a large reusable water dispenser refilled from these depots rather than stacking up single-use bottles, and a growing number of cafes will refill a bottle you bring in for free or a token fee. If your accommodation doesn't already do this, ask — it's increasingly the norm rather than the exception, and it's both cheaper and more responsible than buying a new plastic bottle every day of a two-week trip.
City-by-City Notes
Bali (Denpasar, Badung, Gianyar): Tourist-area accommodation almost universally provides free bottled or filtered water, and refill depots are everywhere in Canggu, Ubud, and Seminyak. Villas with their own water tanks sometimes install under-sink filters — ask your host directly whether the tap is filtered before you assume it isn't.
Jakarta: Stick to bottled water strictly here. The combination of land subsidence and an aging pipe network makes Jakarta's tap water among the least reliable in the country, and even long-term expat residents in Jakarta Selatan and other areas typically install their own filtration or use delivered gallon water rather than trusting the municipal supply.
Yogyakarta: Similar rules apply — bottled or filtered water only. Yogyakarta's groundwater is generally cleaner than Jakarta's coastal supply, but the city still doesn't treat tap water to a standard safe for unfiltered drinking.
Remote islands and rural areas: Bottled water supply can be less consistent the further you get from a major town, so buy extra when you see it rather than assuming the next stop will have stock. Boiling water for at least one minute is a reliable backup if bottled water genuinely isn't available.
Cooking in a Villa or Airbnb Kitchen
A lot of Bali villas and long-stay apartments come with a full kitchen, and it's tempting to cook rather than eat out every meal. The same rule applies here as everywhere else: don't cook with tap water directly. Use bottled or refill-station water for anything you're going to drink as-is, including ice cubes you make yourself, coffee, tea, and soup stock. Tap water is fine for boiling pasta or rice, since the boiling process itself sterilizes it — just don't drink the leftover starchy water afterward. If the villa has a gallon dispenser (the big blue or clear jugs seen in most Indonesian kitchens), that's treated refill-station water and it's the safest source in the house.
Should You Bring a Filter Bottle or Purification Tablets?
Most travelers don't need to. Bottled water and refill depots are so widely available in the places tourists actually go — Bali, Java's main cities, Lombok's tourist areas — that carrying a filtration system is solving a problem that doesn't really exist there. Where it does make sense is multi-day trekking (Rinjani, Ijen sunrise hikes that start before dawn, remote parts of Flores or Sumba) where you might be hours from the next shop. A simple filter straw or a bottle with a built-in filter is inexpensive insurance for exactly those trips, and it also cuts down on how much single-use plastic you end up carrying out of a national park.
Traveling With Kids or a Sensitive Stomach
Children and anyone with an already-sensitive gut should be more conservative than the general advice above, not less. Skip ice entirely for the first few days rather than judging it stall by stall, ask specifically whether a restaurant's ice is factory-made (es kristal or es batu pabrik, as opposed to hand-cut es balok), and bring a stash of oral rehydration salts before you need them rather than searching for a pharmacy while someone is already unwell. It's also worth packing a bottle with a built-in straw filter for kids who might drink from an unfamiliar tap out of habit at a sink.
If You Do Get Sick
Even careful travelers occasionally get traveler's diarrhea, and it's rarely from the water directly — it's more often from ice, produce, or food handling. Mild symptoms (loose stools, mild cramping) usually resolve within a day or two with rest, oral rehydration salts (sold at any pharmacy as oralit), and bland food. Stop drinking anything except water and electrolyte solutions, and avoid dairy, alcohol, and greasy food until you're back to normal.
See a doctor or clinic if you have a high fever, blood in your stool, symptoms lasting more than 48 hours, or signs of serious dehydration like dizziness and very dark urine. Indonesia's private hospitals and clinics in tourist hubs are well equipped for exactly this, and travel insurance that covers medical visits is worth having for precisely this kind of situation.
The Bottom Line
Drinking water safety in Indonesia comes down to one habit: always know where your water came from. Bottled from a real store, filtered at your accommodation, or refilled at a depot — all fine. Straight from any tap, anywhere in the country — don't. Everything else, from ice to teeth-brushing to washing fruit, falls somewhere in between and mostly depends on context you can check in a few seconds. Build the habit in your first day and you won't think about it again for the rest of the trip.