In the last few weeks I have noticed a steady increase in a hissing type noise coming from the pluming in my house.. from the same area where we have a water pressure control. My Neighbors recently experienced a water mains break right where it separates from the city pipes to the ones going to our respective homes. Could this noise be due to an increase in pressure from the water coming into my home . It sounds rather like right after you flush your toilet and you can hear the water filling the tank up again just much softer - you really can't hear it until late at night when your trying to sleep and all is quite.

Your help would be appreciated as I'm trying to decided if I need to call a plumber but as they are so expensive I'd rather avoid unnecessary charges.

Thanks...