However, for transboundary river basins, activities in the different riparian countries need to be further coordinated and harmonized in River Basin Management Plan(s), in particular for basins shared by EU and non-EU countries. The Programme is based on the national programmes of measures, which arc to be made operational by December 2012. In the EU, the Urban Wastewater Treatment Directive (Council Directive 91/271/EEC) requires collection and treatment (basically biological) of wastewater from agglomerations and sets the time frame for compliance. Many countries that acceded to the EU in 2004 and 2007 enlargements — in this subregion, Estonia, Hungary, Latvia, Lithuania, Poland, Slovakia and Romania — were granted transitional periods to comply with the Directive’s requirements.