This new usage exposes human populations exponentially.
In concrete terms, water reuse involves the irrigation of recreational areas (golf courses, public gardens) but also the irrigation of food crops for human consumption (not to be confused with muck spreading). See below for examples of the Luberon and Vendée Eau water reuse projects.
The most ambitious and innovative projects offer advanced treatment solutions for the replenishment of drinking water resources.
The more stringent requirements involved in water reuse call for new methods of water treatment which eliminate residual elements of microorganisms and contaminants and which are compatible with drinking water standards. Additional rigorous monitoring is necessary to ensure the safety of the reused water. This requirement is more or less strict according to end use.