Vsak sistem spremljanja v državi članici se uporabi za tista mesta v interkalibracijski mreži, ki so v ekoregiji in hkrati sodijo k tipu telesa površinske vode, za katerega se bo sistem uporabljal v skladu z zahtevami te direktive.
Each Member State monitoring system shall be applied to those sites in the intercalibration network which are both in the ecoregion and of a surface water body type to which the system will be applied pursuant to the requirements of this Directive.