Good plumber in Lausanne

Does anyone know a good plumber in Lausanne? I have a gate valve on the house's water supply that is dripping quite a bit, and trying to tighten it further leads to a threatening spray.

Are you a homeowner or a tenant? Because if the later you should ask your landlord...

Yeah, I understand that if I were the tenant that it would be the landlord's responsibility to fix the problem. Let's say I am the homeowner; in any case I am looking for a plumber.