Help! Is my water pump bad?
 

I have a bad coolant leak at what appears to be the surface where the water pump mounts to the block. In looking through fastlane parts there are several o-rings and parts listed. Do I need a new water pump or is there an o-ring that can be changed? If so what do I need? The pump doesn't appear to be leaking from the pulley shaft as I am used to when they have failed on other makes I have owned. Thanks for any help.
Steve