Sensitive zone

According to the urban wastewater treatment Directive 91/271/EC, it means a river basin, whose water bodies, significant on the basin scale, are particularly sensitive to pollution. They especially include those which are subject to eutrophication and in which discharges of phosphorus, nitrogen, or both substances, must be reduced. Maps of sensitive zones were issued by the Minister responsible for the environment and are updated at least every 4 years under the conditions planned for their development.