Problem with PWM for motor control

Hi, I am using PWM to control the speed of a water pump. The problem I have is although it works fine, the noise the pump makes is unacceptable. Is there any way to up the frequency of the PWM or any other suggestions?
Many thanks, Andy

Is there any way to up the frequency of the PWM

Yes. Not all PWM pins use the same frequency, anyway.

or any other suggestions?

Insulation. Ear plugs.