Waste water and sewage sludge can affect the quality of waters and soils. In response to this, the EU has adopted Directives and co-financed the building of collecting systems and waste water treatment plants.
The Court checked the implementation of the Urban Waste Water Treatment Directive in four Member States of the Danube river basin. It also examined a sample of 28 treatment plants, to see how they treated waste water, handled sewage sludge and assured financial sustainability.
The Court makes recommendations on reporting, on ways to improve effectiveness, efficiency and the sustainability of treatment plants, on the relevance of concentration limits, on the use of sewage sludge and on monitoring pollutants in sludge.