Plumbing Questions? Ask a Plumber and Get Answers ASAP.
Hi, my name is ***** ***** I am a master plumber. This sounds like it could be water hammer. This is usually a knocking sound but could make high pitch noise. This is not something that is easily diagnosable over the internet.
A few questions:
1) What city and state is the complex located in?
2) What is the piping material and size?
3) How old is the property?
4) Does the problem happen all the time or only in certain situations? Are you even sure it is plumbing related?