Sea Quality

โครงการ ดาวน์โหลด คุณภาพน้ำทะเล ทะเลและชายฝั่ง ชมรม

Sea water quality maps of Koh Samui, Koh Phangan and now also Phuket are available below. Additional test data will be added to the maps with future updates.

Water samples are taken from sites around the islands of Koh Samui and Koh Phangan and analysed according to the Thai government Marine Water Testing procedures for a wide range of possible chemical and biological contaminants (see Marine Water Testing Document below for full details).

If the water sample passes all tests, and are within the prescribed limits, it is given a green pin.

If the water sample fails one or more tests, but by no more than 50% of the limit, it is given a yellow pin.

If the water sample fails one or more of the tests, and is more than 50% over the specific limit, it is given a red pin.

To date, all samples that have failed to be within government limits have failed primarily on the basis of coliform bacterial count. All test data for Phangan , Phuket, 2016-2017, Samui updated with additional sites 2017 and 2018.

Should you require more detailed analytical data on the specific sites and tests, or if you are interested in testing at a specific site, at your own resort or business , please contact us via the email address to discuss further.

If unnatural events or Marine animal deaths are observed on the beaches of Koh Samui, Koh Phangan or Koh Tao, or indeed any other region, they can be reported to the Marine and Coastal Department using the appropriate phone number from the map HERE

Air quality data for Thailand is available from the site Air4Thai

Water Quality Koh Samui Map (2018 updated additional testing sites designated with red *)

Water Quality Koh Phangan Map

Water Quality Phuket Map

Although using slightly different testing and presentation systems this data is broadly comparable with the Samui and Phangan data.

Thai government water quality testing standards and procedures


Department of Marine and Coastal Resources (DMCR) has extensive literature and downloadable books and information available HERE

If you find our water quality maps useful, we would appreciate a donation via PayPal to support us in our eco projects within the Gulf of Thailand.

With thanks from the EcoThailand Team

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