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- New York City water supply system saves billions with protected areas

New York is one of the most densely populated cities on the planet. The nine million residents of the city and its surrounding areas receive most of their drinking water supply from the rural Catskill and Delaware reservoirs. This water is pure thanks to the ecosystems surrounding the lakes, which function as an immense natural purification system. The preservation of these ecosystems, for a total investment of 1.5 billion dollars over 10 years, has made it possible to save the 6 to 8 billion dollars that would have been required for an "industrial" solution: the construction of a specialised water treatment plant.

- "Eau de Paris" (Parisian water supply company) tries to establish protected areas to lower cost of producing drinking water

Paris's water supply is currently provided by a mixed system. Half of the water supplying Paris is purified in treatment works, whilst the other half comes from natural underground sources. These are found within a radius of 100 – 150km of Paris, to the South East and West of the capital.
In this area surface water and subterranean water often come into contact with each other. This makes the underground sources of water vulnerable to any pollution that is produced on the surface. However, many of the basins feeding these resources are in predominantly agricultural areas. To enable these water sources to remain more profitable and environmentally respectful "Eau de Paris", the Parisian water supply company, has been working for several years with the farmers of the region to limit the pollution that is associated with their activities.