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The noise you hear can be any of the pulleys that the belt rides on.This can be an idler pulley or water pump or issues with something like the power steering pump bearings failing or alternator bearings failing.
The best way to locate which is the cause here is using either an automotive stethescope to listen to the noises at the belt driven components while the engine is running or a long rubber hose about 3/4 in diameter to use one end to probe around the engine with the other end up to your ear.Where the noise is the loudest is the component that is failing.
It is very possible this is the water pump failing even though it was replaced as I have seen these fail prematurely as well.But it can also be any of these other components at fault needing replaced.
I would listen with a hose or stethescope to see if you can pinpoint which component is causing the noise.This should be done soon as the bearing may seize up at some point and break the belt leaving you stranded.
The pump bearings can fail with no leaks present.
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