Low water pressure in one fixture is usually a clogged aerator or cartridge, while low pressure throughout the whole house usually points to a partially closed main valve, a failing pressure-reducing valve (PRV), a hidden leak, or old corroded galvanized pipes. Clean the aerators and confirm the main and meter valves are fully open; if the whole house is still weak, call a plumber to test the PRV and check for leaks.
Common causes
- One fixture: clogged aerator or cartridge
- Partially closed main or meter valve
- Failing pressure-reducing valve (PRV)
- Hidden leak in the line
- Old corroded galvanized pipes
What to check, and when to call us
- Is it one fixture or the whole house?
- Clean the faucet aerators (unscrew and rinse).
- Confirm the main shutoff and meter valve are fully open.
If the whole house is weak, call First Response. We test the PRV, check for leaks, and find the real cause.
Frequently asked questions
Why is only my hot water pressure low?
Often sediment in the water heater or a clogged hot line. We flush the heater and check the lines.
What is a PRV and can it fail?
It's the pressure-reducing valve where water enters the home. When it fails, pressure drops or spikes; we test and replace it.
Could it be a leak?
Yes. A hidden leak lowers pressure and raises your bill. We locate it before it causes damage.