The ARA Wetzikon is a water treatment plant located at the edge of Wetzikon.
it is designed for arround 37k peoples, but is allready used arround 120%!
The ARA Wetzikon also treats water for Hitnau and Pfäffikon.
https://www.wetzikon.ch/verwaltung/bau-planung/tiefbau/stadtentwaesserung