Brussels-Capital Region: Monitoring network of the nitrate content in surface waters and groundwater. It was designated in accordance with the prescriptions of the European Directive 91/676/EEC concerning the protection of waters against pollution caused by nitrates from agricultural sources, by the Ministerial Order of 25 May 1999.

Brussels-Capital Region: The nitrate-vulnerable zone is a protected area against the pollution of groundwaters caused by nitrates from agricultural sources. It was designated in accordance with the prescriptions of the European Directive 91/676/EEC, by the Ministerial Order of 25 May 1999.