Why Water Pressure Drops (and When It Signals a Bigger Problem)
March 9, 2026

Quick Answer

Low water pressure may be caused by clogged aerators, partially closed valves, a failing pressure regulator, pipe corrosion, or a hidden leak. If pressure drops suddenly across the whole property, check the main valve and contact a plumber.

First question: whole house or one fixture?

  • One fixture: aerator, cartridge, local shutoff
  • Whole house: PRV, main valve, leak, supply issue, aging pipes

Common causes

  • Mineral buildup in aerators and showerheads
  • Old or failing PRV (pressure reducing valve)
  • Partially closed main valve
  • Galvanized pipe corrosion restricting flow
  • Hidden leaks that reduce pressure and increase bills

When to treat it as urgent

  • Sudden major drop across the property
  • Pressure drop plus wet areas or bill spike
  • Pressure drop plus water heater issues

FAQ

  • Can the city cause low pressure?

    Yes, during repairs or peak demand.

  • Is low pressure a leak sign?

     It can be, especially with bill changes.


  • Should I replace my PRV?

    If it is failing, replacement is often the clean fix.

If pressure issues are recurring, CG Plumbing can diagnose the cause and fix it right the first time.

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