Drinking Water on Koh Phangan: Refills and the Dry Season

Water on Koh Phangan: Drinking It, Refilling It, and the Dry Months

Most people arrive on Koh Phangan and buy a plastic bottle at the 7-Eleven in Thong Sala without thinking about it. Two weeks later they have gone through sixty of them. There is a better system, and it takes about ten minutes to set up.

There is also a second question behind the first, which nobody tells you at the ferry pier: the island does not have much fresh water. In a dry year that becomes everyone's problem, including yours, and it changes what a sensible booking question looks like.

Where the water in your tap comes from

Phangan has no large river and no pipeline from the mainland. Water comes from rainfall caught in the interior hills, from reservoirs feeding the municipal supply, and from private wells. Which of these reaches your shower depends entirely on where you are staying.

Properties in and around Thong Sala and the southern villages are usually on the government mains. Places further out, and almost anything on a hill, tend to run on a well and a pump into a storage tank, often with rainwater catchment alongside. Hotels and villas that have neither in sufficient quantity buy from the private water trucks that work the island's roads — a normal, unremarkable part of life here, not a sign that something has gone wrong.

One practical consequence of the pump-and-tank arrangement: no electricity means no pump. If the power goes out on a hill property, the water in the roof tank is what you have until it comes back. That is one of several reasons hillside houses here keep more storage than they look like they need.

Can you drink it?

No. Tap water on Koh Phangan is household water — washing, laundry, showering — and is not treated to drinking standard. Well water in particular can carry a strong mineral taste; residents routinely describe it as high in iron.

In practice, almost everyone showers in it, washes vegetables in it and brushes their teeth with it without any trouble. If you have a sensitive stomach or are travelling with small children, use bottled or filtered water for teeth as well. It costs nothing to be careful in the first few days while you work out how your body is handling the heat, the chillies and the swimming.

Ice is the usual worry and is mostly a misplaced one. The cylindrical tube ice with a hole through the middle, which is what you get in nearly every café and restaurant, is produced in commercial ice factories from treated water. Rougher crushed or block ice, the kind used to keep bottles and fish cold in a cooler, is a different product and not meant for drinking.

The refill system, which is what residents actually use

All over the island there are coin-operated water machines — small freestanding blue-and-white kiosks, usually outside a mini-mart, a laundry or a block of flats. They run tap or well water through reverse osmosis and UV, and they charge about one baht a litre. Some give 1.5 litres for the coin.

You bring your own container. The machines take coins only, generally 1, 2, 5 and 10 baht pieces, and they do not give change, so keep a few coins in the scooter's under-seat compartment. Older coins tend to be accepted more reliably than brand-new ones. A 20-litre bottle, which is the standard household format here and is sold with a returnable deposit at most shops, costs around twenty baht to fill. That is a week of drinking water for two people for the price of one small bottle at the airport.

If you would rather not handle the logistics at all, many shops will deliver the big bottles, and most villas, guesthouses and longer-stay rentals keep a supply going as a matter of course. Ask before you buy anything.

For a few days of travelling, a 1.5-litre bottle from a mini-mart is around 12 to 15 baht and a 600 ml bottle is around 7 to 10 baht. Prices on the island can run slightly above mainland ones, especially at beach shops far from a 7-Eleven. A filter bottle is worth packing if you move around a lot, though on Phangan the refill machines make it close to redundant.

February to May, when the island runs short

The rains here fall mainly from October to December. Everything the island drinks between January and the next monsoon comes out of what fell in those weeks.

After a weak monsoon, the dry months bite. In 2023 a shortage from late March led to rotational rationing of the mains supply, with roughly 3,500 to 4,000 cubic metres a day reaching the pipes — not enough for the island — and some areas going dry on some days while others had flow. Private trucks ran water up to the hotels on higher ground, and the cost of that made its way onto room rates. Shortages of some degree are common in dry years, and 2023 was not unique.

What this means for a visitor in March, April or May:

• Ask your accommodation what its water source is. Mains, well, rainwater catchment, truck delivery — any answer is fine, but a host who cannot tell you is a host who has not thought about it.
• Expect a request to take short showers. Take it seriously. It is not a green gesture; it is the tank.
• Pools are generally maintained rather than refilled, and good properties use saltwater systems that need less turnover.
• If the tap runs slowly or stops briefly in the afternoon, it is usually the pump or the tank refilling, not a fault.

At Villa Ullassa the water is harvested rainfall stored on site, which is why the house is quietly insistent about not leaving taps running in April. The rest of our practical island notes live in the journal.

The short version

Don't drink the tap. Buy a 20-litre bottle on day one, fill it for a baht a litre at the machine nearest you, and keep a refillable bottle in your bag. Tube ice is fine. Come in March or April and treat water as the limited thing it is here — the island's supply is thinner than its greenery suggests, and the people who live here feel it long after the visitors have flown home.