Asked by Andrew Bardsley - Yorkshire Water

What is the largest water treatment works in the world and how much water can it output?

1. Potable Water
There seem to be several candidates and categories here and I have chosen 3 to illustrate the possibilities:

• 1) Coagulation/Filtration - Robert B Diemer Works, Yorba Linda A California rated at 520 Million gallons (US)/day.
  I make this some 1650Ml/day from a 210 acre site.


• 2) Microfiltration - Sandhurst, Australia rated at 126Ml/day


• 3) Ultrafiltration - Clay Lane , Three Valleys rated at 160 Ml/day

To put these figures, especially the US works into context, Northumbrian Water's Broken Scar WTW is given in some press releases as having a capacity of 150Ml/day.