Tap water, wells and rain tanks, 18.9L delivery bottles, refill machines, RO filters and ice - how drinking water actually works on the Andaman coast, what it costs in baht, and the habits every long-stay resident picks up in week one.
Drinking water is one of the first small systems you set up in a Krabi home, and one of the cheapest. The rule is simple: nobody drinks the tap water - not because it is dramatically dangerous, but because long pipe runs, storage tanks, private wells, rain jars and dry-season strain mean quality at the faucet is never guaranteed, and Krabi's limestone geology makes untreated groundwater hard and mineral-heavy on top. Instead the province runs on sealed bottles, delivered 18.9L jugs, coin-operated refill machines and home RO filters, all of which cost remarkably little. Here is exactly how each option works and what it costs.
Nobody in Krabi - Thai or foreign - drinks straight from the tap, and you should not either. Even where the supply is treated municipal water from the Provincial Waterworks Authority (PWA), it travels through long pipe runs and sits in rooftop or ground-level storage tanks at your building or villa before it reaches the faucet, so quality at the tap is never guaranteed. Treat tap water as for showering, washing and cleaning only - drinking water always comes from a sealed bottle, a delivered jug or a proper filter.
Krabi homes run on a patchwork of sources. Krabi Town, Ao Nang and the main tourist strips are largely on treated PWA municipal water; villa estates in Klong Muang, Ao Nammao and inland toward Nong Thale often draw from private wells and boreholes; and plenty of rural houses still keep big ceramic or concrete rain jars as backup. Krabi's limestone karst geology makes well water noticeably hard and mineral-heavy, and untreated well or rain water can carry sediment and bacteria - ask which system your home uses before you sign a lease.
Railay is boat-access only and Koh Lanta's groundwater is limited, so island and peninsula homes lean on wells, storage tanks and water brought in by truck or boat. Supply is more fragile and drinking water costs a little more the further you are from the mainland road network - stock a few extra 6L bottles in the wet season when boats can be disrupted, and never assume island tank water is potable.
Krabi's dry season runs roughly January to April, and in drought years reservoirs and wells run low - estates truck in water to refill tanks, pressure dips, and stored water sits longer in the heat. It is one more reason the drinking supply is always a bottle or a filter, never the pipe, and why villa tenants should ask how their tank is topped up in March.
Most residents brush their teeth with tap water without problems, though newcomers with sensitive stomachs often use bottled water for the first few weeks. For cooking, water that reaches a full rolling boil (rice, soups, pasta) is fine; for anything unboiled - rinsing salads, ice cubes, baby formula - use bottled or filtered water.
Sealed bottled water is cheap and everywhere: a 600ml bottle is around 7-10 THB and a 1.5L bottle roughly 10-17 THB at 7-Eleven, Lotus's, Big C or Makro in Krabi Town, with trusted national brands like Singha, Nestle Pure Life, Crystal and Aura on every shelf. Supermarket 6L bottles run about 25-40 THB and are the practical kitchen size; expect a few baht more at island minimarts.
The cheapest household set-up is the classic 18.9L (5-gallon) bottle. Local Krabi water depots deliver across Krabi Town, Ao Nang and the villa zones, typically 30-70 THB per bottle delivered, with a refundable deposit of roughly 100-200 THB per bottle the first time. Many sois have a regular weekly delivery round - ask your landlord, building office or neighbours which supplier already serves your street, or collect bottles yourself from Makro and the big supermarkets.
A simple hand pump or rechargeable electric pump for the big bottles costs 100-400 THB at Lotus's, HomePro or Lazada; a hot/cold dispenser runs about 1,500-5,000 THB. Many long-stay rentals already have one - worth asking for in lease negotiations.
Coin-operated reverse-osmosis vending machines sit outside minimarts and apartment buildings in Krabi Town and Ao Nang and dispense water for roughly 1-2 THB per litre - bring your own bottle. Quality depends entirely on how well the owner maintains the filters, so use machines that look clean and busy and prefer branded, serviced units. They are ideal for cooking and kettle water even if you keep sealed bottles for drinking.
A proper under-sink reverse-osmosis system is the long-term answer for families and heavy users: expect roughly 4,000-15,000 THB installed depending on brand and stages, plus 1,500-3,000 THB a year in replacement filters. On PWA water an RO tap effectively ends your bottle habit; on Krabi's hard, mineral-heavy well water it needs the right pre-filtration to cope with sediment and limescale, so have a local supplier test the source first.
Pitcher filters and simple counter-top units (600-3,000 THB) improve taste and remove chlorine from municipal water, but they are not designed to make questionable well or rain-tank water safe on their own. They suit apartment dwellers on town supply; villa tenants on boreholes should step up to RO or stick with delivered bottles.
A full rolling boil for one minute kills bacteria, viruses and parasites, which makes boiled tap water biologically safe - but boiling does not remove sediment, hardness or metals, and it is tedious at household scale in a hot climate. Treat it as a backup, not a system.
Villas on well water often run a whole-house sediment-and-carbon setup (10,000-40,000 THB) so showers, laundry and appliances get clean, softer water, with a separate RO tap in the kitchen for drinking - especially worthwhile in Krabi where karst groundwater scales up kettles and heating elements fast. If you are renting, treatment is the owner's responsibility: ask what is installed and when the filters were last changed.
The cylindrical ice with a hole through the middle that you see in drinks all over Thailand is factory-made from treated water under food-safety standards and is safe - restaurants and beach bars buy it in sacks from licensed ice plants. Be more cautious with crushed or hand-cut block ice at very informal stalls, which may come from ice not intended for direct consumption.
Established restaurants and cafes in Krabi Town, Ao Nang and on the islands serve purified water and factory ice as standard - complimentary table water normally comes from an 18.9L purified bottle. A sealed bottle is the zero-doubt default at street-food stalls and longtail-boat picnics.
Krabi heat and humidity pull two to three litres a day out of an active adult, and more on climbing, kayaking or island-hopping days. Keep water within reach, and for heavy-sweat days grab oral rehydration salts (ORS) - pharmacies sell electrolyte sachets for a few baht - rather than relying on sugary sports drinks. Persistent stomach trouble in your first weeks is more often food- or heat-related than from bottled water, but see a clinic if it lasts.
No. Even treated municipal PWA water passes through long pipes and building storage tanks before your faucet, and many villas and island homes run on wells or rain tanks that are firmly non-potable. Everyone drinks bottled, delivered or properly filtered water - tap water is for washing and cleaning.
Most residents do so without any issue. If you have a sensitive stomach or are newly arrived, use bottled water for the first couple of weeks until your system settles, and always use bottled or RO water for baby formula.
Very little. A couple using delivered 18.9L bottles typically spends 150-400 THB a month; refill vending machines at 1-2 THB per litre cost even less. An under-sink RO system costs 4,000-15,000 THB up front plus about 1,500-3,000 THB a year in filters, and usually pays for itself within a couple of years for a family.
Local water depots run delivery rounds across Krabi Town, Ao Nang and the villa zones - ask your landlord, building office or neighbours which supplier already serves your soi. Expect roughly 30-70 THB per bottle delivered plus a refundable 100-200 THB deposit per bottle the first time. Makro and the big supermarkets also sell the large bottles if you prefer to collect.
Generally yes - they are small reverse-osmosis units - but quality depends on maintenance. Choose machines that look clean and are visibly busy, prefer branded serviced units, and wash your refill bottles regularly. Many long-stayers use them for cooking water and keep sealed bottles for drinking.
Boat-access Railay and the islands rely on wells, storage tanks and water brought in by truck or boat, so supply is more fragile and bottled water costs a little more than on the mainland. Stick to sealed bottles or well-maintained refill machines, and keep a reserve of 6L bottles in the house.
No - clear is not clean. Krabi's limestone groundwater is hard and mineral-heavy and can carry bacteria and sediment regardless of how it looks. Well water needs proper treatment (sediment, carbon and an RO stage for drinking) before it is potable; otherwise use it for washing only.
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Browse Krabi areas and homes, and get set up for long-stay life on the Andaman coast.
Water arrangements, suppliers and prices vary by area and property and change often - confirm current details locally.
Hero photo by Andrea Román on Pexels. General information only; costs in Thai baht (THB) and are indicative.