The answer depends on several factors including the age of your home and the type of fixtures you have installed. Generally speaking, most homes need to be inspected by a professional plumber at least once every year or two in order to identify any potential problems before they become serious issues. This inspection should include checking for leaks, inspecting pipes for corrosion or blockages, and testing water pressure levels as well as other components such as faucets and toilets.
If you live in an older home with outdated fixtures then it may be necessary to inspect more frequently than every two years; this will also depend on how much use these systems get from day-to-day activity within the house itself (e.g., if there are multiple people living under one roof).
