In what situation would water be considered a non-renewable resource

Me personally I feel as water will always be a renewable resource, Now we have technology to the point where we can reuse the water we have already used indefinitely whither that be through the process of distillation, Or filter bad products out of the water at water plants. The situation I can think of is if the water has contact with nuclear waste or was used at a cooling plant for nuclear waste.

There is a finite amount of water on Earth; pollution sometimes removes that resource as usable.

Explanation:

cancer   is   essentially   uncontrolled   mitosis   of specialized cells