I like the sink location too.
Not a good idea, too close to 'food, etc. contamination' and the bacteria, etc. then enter the tankage by 'retrograde' movement from the 'sink' area TO the tank.
If you had a portable drinking water container, would you leave the lid off or keep it in/near your 'sink'? Dont think so once you saw or realized the quickly growing bacteria colonies (slime) that form on the inside walls of the container.