The DPWE research is divided into four themes: water quality, sources, water infrastructure and treatment. Each theme has its own supervisory group which complements the steering group. These supervisory groups are, among other things, responsible for consulting with and informing their membership. Among the forms this takes are the so-called DPWE workshops: substantive workshops that are held at one of the DPWE companies. Every year four workshops are organised in which the themes are addressed, and in which one DPWE project is focused upon, along with possible related non-DPWE research work. The theme of this workshop is sources and quality.