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Wahs are almost like single coil pups in that they pick up noise from everything. One common noise wahs pick up is from it being too close to powerstrip full of wall warts on homebuilt pedalboards. You step on the wah to activate it, and an unbearable noise goes through your amp. Once I got rid of the strip, got a better power source and rearranged things so the wah is AS FAR AS POSSIBLE from the power source, the problem was solved.

Best thing you can do is get a board with some kind of quieter built in power supply. Some guys like me use boards with built in power supplies, others are using stuff like the MXR power brick, the Voodoo Labs Pedal Power.