TSMC is aiming for a 90% water recycling rate which will help reduce the demand on the water supply. Still, the Phoenix area has been in drought for a decade or more so it’s a valid question. Probably one of the reasons why Phoenix is ranked as one of the least sustainable cities in the country…I don’t understand where that Arizona factory is going to get all the water these fabs require, unless this is long term planning as all the elderly who live there start to die off…