During your periodic checkups, you may begin to notice water forming underneath your pump. While this is not exactly uncommon, it is not normal and should be dealt with. As for the reason why the water is forming there, it probably is a simple pressure side leak. While there are a few different factors that can cause, all you should be concerned with is how to fix it.
What you will want to do is inspect the impeller housing O-ring and shaft seal on your unit. You will probably want to go out and invest in a go kit as it will supply you with all the seals, sealant and O-rings you need to make a repair on the spot.