Without actually hearing the sound up close I don't think anyone could give you good advice on this problem. However, if it's the water pump the car should be or very soon will be running hot. This is something you should watch for.
If it is your water (coolant pump) you will need to remove the passenger seat and engine access panel behind the seats to remove it and install a new one. Your coolant pump is behind the lower-left most pulley when looking at your serpentine belt from inside the car. Maybe pull the access hatch off and listen to it while the engine is running?
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