A noticeable drop in water pressure throughout your house or at nearby fixtures when you flush a toilet is typically caused by undersized supply piping (such as old 1/2-inch lines feeding multiple branch fixtures), mineral-scaled pipes restricting flow capacity, or a failing pressure reducing valve (PRV). When the toilet tank refills, it draws a large volume of water instantly; if your supply pipes lack adequate diameter or flow capacity to handle simultaneous demand, pressure at nearby faucets plummets. Verification: Monitor if pressure drops occur only when specific high-demand fixtures run concurrently.
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