Hydra's Water Supply
Greek Philospher Aristotle Thought Of It First
Back in the 4th century B.C., Aristotle imagined using successive filters to remove the salt from seawater.
Along with much of the world, water quality and a shortage of drinkable water is a big concern on Hydra especially as the island doesn't have sufficient natual sources of fresh water to meet the needs of its population. Today, the Hydra solution is to supply desalinated water and well as importing approximately 3.5 - 4 million 1ltr bottles of drinking water that are consumed each year.
Desalinated water is safe to drink and on Hydra the water output reaches European standards required. The desalination plant takes sea water and processes it to remove the salt. Chlorine is added during the processing to kill bacteria and lime is added to counteract the effects of the chlorine.
Further Reseach information:
On a personal note: While I am sure that it is safe to drink water from the tap, I prefer to only use it to boil for coffee/tea and to use for cooking. If I want to drink cold water, I still prefer to use bottled water. It's not that I don't trust desalinated water, more that I worry about contaminates from the many pipes used to get water from the plant in Mandraki to Hydra Town.
An Historical Insight
Natural Springs: Historically, circa 300 years ago and more, Hydra had a number of freshwater springs to supply residents with their drinking water. Many people are of the opinion that the island was named for its water. Over time, seismic activty disrupted these springs, contaminated some, dried up others but also created new ones. However, while the newer sources are today incorporated in the mains water supply, the springs are no longer utilized by residents as a water source.
Cisternas: As more homes were constructed, and to make it more convenient for residents, in the 16th & 17th centuries Hydra houses were built incorporating 'Cisternas' (large water tanks to store rainwater). Rainwater would fall on terraces and roofs to drain into the underground cisternas so that householders could use a bucket from a well in their kitchen to access it. During numerous regional wars, and a particularly bad plague during the 18th century, the population of the island was reduced and many left Hydra to seek their fortune elsewhere. The cisternas along with the buildings fell into disrepair. However during the 'renaissance' of Hydra in the late 1700's - mid 1800's the island was repopulated, restoring property, rebuilding and of course repairing cisternas as the primary water supply of homes. A large number of these cisternas are still used today but most frequently as a supplement to the island's mains service used to water gardens or provide water for bathing/cleaning.
Wells: Organised wells were introduced on Hydra around the mid to late 1700's. The then 'ruling classes', the wealthy Hydriot merchants and ship owners, while still under Ottoman rule, had a number of wells dug, not only to provide freshwater for those living in property without cisternas but also to provide local employment. As with the natural springs on Hydra, sciesmic activity, especially in the last 100 years has damaged most of the wells but the most famous one on the island is at Kala Pigadia (literally translated as Good Wells). There are two wells at Kala Pigadia and both function today as they did when they were originally built. Many of the homeowners in the area at the top of Andreas Miaoulia Street, regularly go to the well to collect water. I can speak from experience, having used this water for over a year, that it is 'potable' (drinkable). Down in the town the biggest well sadly has been contaminated with salt water and sealed off. It can still be seen in one of the more picturesque squares and is locally known as the 'Salty Well'.