If you notice a drop in water pressure, start by checking if the issue is isolated to one fixture or affects the entire house. If it’s just one fixture, it could be a clogged aerator or showerhead. For a whole-house issue, inspect the main water valve to ensure it’s fully open. Also, check for visible leaks or damaged pipes. If the problem persists, it could be due to sediment buildup in your pipes or a failing pressure regulator. In this case, it’s best to call a professional plumber for a thorough inspection.