Water scarcity on an island

Islands have no rivers to spare, and Koh Samui's growth has outrun its water supply. According to 2025 reporting, the underwater pipeline from the mainland supplies only about 21,000 cubic metres of water per day - not enough for the island's residents plus millions of annual visitors - so locals and businesses buy more expensive trucked water from private companies and rely on groundwater wells, which can be depleted or turn brackish in dry periods. Drought years have brought genuine shortages on the island. Tourism multiplies the load: pools, gardens, laundry, and long showers make resort water use per person far higher than local household use. Simple visitor actions genuinely matter here: take short showers, reuse towels and linens (most hotels offer this), report leaking taps, do not leave water running while brushing teeth, and be understanding if water pressure drops in the dry season. Choosing accommodation that treats and reuses its own water is one of the more meaningful environmental choices you can make on Samui.

Dates

Pipeline ~21,000 m³/day as reported 2025; drought-prone

Highlights

• Mainland pipeline supplies ~21,000 m³/day - below demand
• Many businesses buy trucked water; wells risk depletion
• Resort water use per guest far exceeds local household use
• Short showers and towel reuse make a measurable difference

Local tips

• Don't drink tap water - but do conserve it
• Dry season (roughly February-April) is when shortages bite hardest

Frequently asked questions

Does Koh Samui have water shortages?

Yes. The mainland pipeline delivers about 21,000 cubic metres a day, less than demand, and drought years bring real shortages. Many resorts truck in water.

How can tourists save water on Samui?

Short showers, reusing towels, turning taps off, and choosing accommodation with water recycling all help on an island with limited supply.