On April 6th, the European Commission decided to refer Spain to the Court of Justice of the European Union for failure to comply with the Urban Waste Water Directive.
The Directive aims at protecting the environment from the adverse effects of urban wastewater coming from domestic and certain industrial sectors. Under the Directive, towns and cities are required to put in place the necessary infrastructure in order to collect and treat their urban waste waters, thus eliminating or reducing all their undesirable effects when they are discharged into water bodies.
If you want to find more info, read the official press release.