Well down here I don’t know that there are in fact any reguiations that pertain to water noise excpet those of the local authority that refer to the loudness level of “noise”. The use of a decibel reading meter would give you the effect you are seeking it would clearly show the level of noise that could be used in any case you were likely to put forward.
Selgas Services Ltd
Craftsman Gasfitters, Plumbers, Electrical Service Technicians