Use of water by citizens increases as water quality improves
Water quality in Amsterdam (www.waternet.nl) and in other cities in Europe (EEA, 2016) is improving as a result of a decrease of industrial activities and water management measures such as improved wastewater treatment.
Currently in Amsterdam the water quality is better than it has ever been before. An important reason for this is that all houses are now connected to the central sewage system. Although the building of a centralized sewage system began in the nineteenth century, wastewater from the houses along the canals was flushed through these canals until 1987. Another improvement of the water quality came with the relocation of the wastewater treatment plants outside of the city. The canals no longer contain wastewater OR treated wastewater. As a result, the water quality is good enough for swimming on most days. It is only shortly after extreme rain events (about five days a year) that there is an overflow of the sewage system. After such events it takes about three days for the water system to recover.