1998 Toyota 4Runner Slow drop in coolant level

I have seen alot of theose V-6's leak a tiny amount out of thewater pump area, but not enough to leave any puddles or signs of leakage. The timing belt and engine heat dissipate it before it can leak out. If it is just a smallamount every 6 months, Im not too sure Iwould worry about it until it becomes more of an issue, then it will be worth taking it apart to see. You should be due for your second timing belt/water pump real soon anyway at that mileage