Fresh water isn't meaningfully a closed loop. We are draining fresh water aquifers, causing the land above them to sink downwards eliminating the voids where fresh water was stored, and moving the formerly fresh water into the ocean where it is no longer drinkable, usable for growing crops, or for most industrial purposes.

We do get new fresh water at a reasonable pace thanks to rain - but in many parts of the world we are using it faster than that, and not just depleting the stored volume of fresh water but destroying the storage "containers" themselves.