Across the globe, drinking water presents a challenge in terms of both availability – now and in the future – and quality. The same is true of surface water. Water authorities, in particular, must address this challenge. Within the Clean Drinking Water and Sanitation impact area, we are helping the Vechtstromen water authority modify eight of its wastewater treatment plants so that they comply with Europe’s Water Framework Directive. Witteveen+Bos is also working on large-scale sludge digestion projects at various treatment plants. These efforts will produce green gas that can be distributed via the natural gas network.