Low Water Pressure: What It Can Mean
One fixture or the whole house?
Low pressure at a single faucet is often a clogged aerator, a failing supply stop, or that fixture’s valve. Low pressure everywhere (showers, laundry, and kitchen at once points farther back: a partially closed main, a failing pressure regulator, mineral buildup, or a leak on the supply side.
Clues that it is not “just the showerhead”
- Pressure dropped suddenly rather than over years
- You hear water running when fixtures are off
- The meter moves with nothing in use
- Water is discolored or rusty on galvanized lines
Those clues overlap with leak detection and, in older homes, repiping.
What to check before you call
Confirm the main valve is fully open. If only one fixture is weak, unscrew the aerator and look for debris if you are comfortable doing that. Do not force a frozen or corroded valve. If pressure is down throughout the house, skip DIY pipe work and request service.
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Frequently asked questions
Can a hidden leak cause low pressure?
Yes. A supply leak can steal pressure before water reaches fixtures. It is one possible cause, not the only one. Diagnosis still needs a look at the system.