Kraków Water supply system has four treatment plants, with water taken in from:

• Sanka Stream (Bielany Water Treatment Plant)
• Dłubnia River (Dłubnia Water Treatment Plant)
• Rudawa River (Rudawa Water Treatment Plant)
• Dobczyce Reservoir on the Raba River (Raba Water Treatment Plant)

Depending on which part of Kraków you live in, your tap is supplied by a different water treatment plant. In some areas water is mixed, meaning it comes from more than one plant.