Close the water chain

People use clean water and produce wastewater, that needs purification before it returns in the water cycle to produce clean water again. In 2008 municipality of Texel and the water board agreed on wastewater policies. To  optimise the water chain they started to improve waste water collection and treatment. However, (drinking) water production and water use are hardly addressed. In theory there is sufficient freshwater at the island to abstract sufficient m3 for drinking; the main problem however is that both rain and consumption of fresh water are not equally distributed over the year. Moreover, a lot of m3 are pumped out every year. What innovations can optimize the water chain, and how can the water chain be managed to become 100% self-sufficient?