Low water pressure can come from something simple — a clogged faucet aerator or showerhead full of mineral buildup — or from bigger issues like a partially closed valve, corroded or leaking pipes, or a problem with the building’s supply. Start by checking whether it affects one fixture or the whole home: one fixture usually means a clogged aerator (easy to clean), while low pressure everywhere points to a supply or pipe problem that may need a plumber.
The first diagnostic question for low water pressure is simple: is it one fixture or the whole place? That single distinction narrows the cause dramatically and tells you whether it is a quick DIY fix or a bigger job.
If only one faucet or shower is weak, the usual culprit is mineral buildup in the aerator (the screen at the tip of the faucet) or the showerhead. These unscrew and can be soaked in vinegar to dissolve the deposits — an easy, free fix that restores pressure surprisingly often, especially in areas with hard water.
If pressure is low throughout the home, the cause is more likely upstream: a main shutoff or pressure-reducing valve that is partially closed, corroded or narrowed old pipes (common in older NYC buildings), a hidden leak, or an issue with the building’s or municipal supply. Some of these you can check — make sure your main valve is fully open — but most need a plumber to diagnose.
In apartments and multi-unit buildings, low pressure can also be a building-wide issue rather than something in your unit, in which case building management may need to be involved. If cleaning the aerators does not help and the problem is widespread, a plumber can locate whether it is your pipes or the building’s system.
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Why is water pressure low in just one faucet?
Usually mineral buildup in the aerator or showerhead. Unscrew it and soak it in vinegar to dissolve the deposits — an easy fix that often restores pressure.
What causes low pressure throughout the house?
A partially closed main or pressure-reducing valve, corroded or narrowed old pipes, a hidden leak, or a building/municipal supply issue. Most of these need a plumber to diagnose.
Could low pressure be a building problem in my apartment?
Yes. In multi-unit buildings, low pressure can be building-wide rather than in your unit, in which case building management may need to address it.