I live in Hittnau. My personal waste water is cleaning The ARA Pfäffikon. The adress from the ARA Pfäffikon is Schanzweg 2, 8330 Pfäffikon (see the map below). They clean the waste water from Hittnau, Bäretswil, Fehraltorf and Pfäffikon.
Expansion size: 17 000 population equivalents
Link:
ARA Pfäffikon [gwpzh.ch]