Amsterdam’s journey toward cleaner water in the Amstel River has been marked by key moments. Initiatives such as Sarphaat’s early efforts in 1847 to combat cholera outbreaks laid the groundwork for future improvements. Notably, the improved of the sewage system to reduce CSO’s (combined sewer overflows) to max 3 a year significantly improved water quality. the relocation of the RWZI in 2006 also helped, eliminating direct sewage lines into the river and enhancing its purity. 

Another crucial factor has been the shift in public perception. Once deemed unhealthy for swimming, the inauguration of the Amsterdam City Swim in 2011 marked a turning point for the Amstel River. The participation of Her Royal Highness Queen Maxima underscored the growing confidence in the river’s cleanliness, helping the reputation of swimability. 

Today, the advocacy of individuals like ex-alderman Eric van den Burg and Maarten Ouboter further promotes the vision of swimmable rivers, highlighting the collective commitment to sustaining the Amstel’s water quality.