Yes, you can drink tap water in Santorini. Like all of the rest of the country, the water in Santorini meets EU standards for water quality. Most of the water you will drink in Santorini will come from a desalination plant.
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Instead, the majority of the tap water comes from ocean water that has been run through a desalination plant to make it safe for human consumption. Technically, Santorini's tap water is safe to drink. However, it's also brackish, and the water supply system itself isn't always reliable.
No, in Santorini you cannot flush toilet paper down the toilet bowl. As with most places in Greece, toilet paper cannot be flushed down the toilet. You should place the used toilet paper into a special trash bin located next to it. The hosts or hotel staff empty the bin every day and put a new bag in it.
The warmest water temperature is in August with an average around 77.2°F / 25.1°C. The coldest month is March with an average water temperature of 61.7°F / 16.5°C.
Is it safe to drink the tap water in Greece? In Athens and most places across mainland Greece, the tap water is perfectly safe to drink. In harbor towns and the Greek Islands, however, it is generally better to drink bottled water, which is readily available and very cheap.
Santorini is pretty safe. Travelers report feeling comfortable walking around the streets both day and night. Even pickpocketing is few and far between here.
However, swimming in the clear blue water of Santorini is wonderfully refreshing. Since the beaches have coarse sand, there's little dust to cloud the water. Don't come to Santorini primarily for the beaches – come for the volcano boat tours, incredible views, wine, hikes, nightlife, and great food.
This glorious blue colour is due partly to the reflection of the blue skies and partly to the fact that the sea does not contain large quantities of solid matter such as plankton, mud and dust floating in the water. The way in which the Greek Sea sparkles is like no other the world over.
On the coldest nights (mainly on the first days of the month), the temperature may drop to 10°C/50°F. On the warmest days (mainly on the last days of the month), the temperature may reach 24°C/75.2°F. The day lasts approximately 13 hours.
It is acceptable to wear shorts, whether you are a woman or a man. However, NEVER (and I do mean NEVER) wear shorts if you want to visit a church or monastery. Also, if you plan to do a walking tour of Athens, ditch the shorts and opt for a dress – if you are a woman – or a pair of long pants – if you are a man.
Santorini's main resort town of Kamari has a long stretch of brown sand and clear, calm water that says “jump in!” Food, drink and music are never far as the sands are lined with cafes, bars and clubs. Renting a lounger for the day is easy and you can try a variety of water sports, many of which are geared to families.
Bathing suits are for the beach only.Never leave the beach without covering up. Also, it is considered quite rude to go barefoot on the beach. And while there are some nude beaches in Greece they are few and far between.
Water is safe everywhere in Greece with the possible exceptions mentioned by bob, so no problem in using it for cleaning your teeth, washing food etc. But in a few places it doesn't taste very good - it can be just a bit salty, so you wouldn't want to use it for ice cubes or coffee/tea/drinking.