Two ways to tell. Look outside and locate your fresh water fill. The water pump will be inside the trailer close to that fill line. Or turn on the pump and locate where the sound is coming from. Pump will likely be located behind an access panel that will require you to remove a couple of screws.
Look at the water filter. Is it blue, cylindrical, about a foot long with a male threaded connector on one end and a female connector on the other? If so, then it attaches to the hose you use for fresh water.
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