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The majority of wastewater plants in northern and central Europe now apply tertiary treatment although elsewhere in the EU, particularly in the south-east, the proportion of primary and secondary treatment is higher (see Figure 7.1). While considerable progress has been made in implementing the UWWTD, excluding the longer compliance timelines for the newer Member State, full compliance is yet to be achieved, including the lack of more stringent tertiary treatment in some sensitive areas and inadequate treatment levels in wastewater treatment plants in some larger cities (Text box; EC, 2011).