Repair guide
Low water pressure in the house
Updated 30 Sep 2026 · AR Logic LLC · 2 sources
Rarely an emergency
First decide whether it is one fixture or the whole house. One weak tap or shower is almost always a clogged aerator or showerhead; low pressure everywhere points at the main shutoff not fully open, a failing pressure-reducing valve, a leak, or the supply itself. Home water pressure works best between 45 and 60 psi, and a hose-bib gauge tells you where you are.
Is low water pressure an emergency?
Rarely. It can be the first sign of a hidden leak, though: if pressure dropped suddenly and you hear running water with every tap off, or see damp walls or ceilings, shut off the main valve and call a plumber today.
Snap a photo — see what it is, how urgent, who to call.
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Managers: set it up for your buildings →What to check, in order
One fixture: the aerator or showerhead
Unscrew the aerator at the tip of the faucet or the showerhead and clean out the mineral scale and grit. EPA WaterSense advises inspecting aerators for scale build-up that restricts flow [2].
Hot only: the water heater
Low pressure on hot water only points at the heater’s shutoff valve or sediment in the tank or outlet.
Whole house: measure it
Buy a pressure gauge that screws onto an outside hose bib, turn every fixture off, open the bib fully and read it. Fixtures work best at 45–60 psi; much lower may mean a leak in the house [1].
Whole house: the main shutoff
After any plumbing work, the main valve is sometimes left partly closed. Open it fully.
Whole house: the pressure-reducing valve
Many homes have a bell-shaped regulator (PRV) just after the main. When one fails it can drop the pressure; a plumber can test and adjust or replace it [1].
Check for a leak
With every tap and water-using appliance off, watch the water meter. If it moves, water is going somewhere.
Ask the neighbours or the utility
If the street is affected too, it is the supply — call the water utility.
Safety first
- If you find water in walls or ceilings, switch off power to that area before investigating.
When to call a pro
Call a plumber if the meter shows a leak, the PRV needs replacing, or old galvanized pipe is narrowing with corrosion.
What to photograph
For the Triage Profile, photograph the pressure gauge reading at the hose bib, or the regulator and main valve where the water enters the house. One clear photo in good light is enough; the Triage Profile says what it is, how urgent it is (emergency, today, this week or whenever), and which trade to call.
Sources
Not sure what you’re looking at?
Snap a photo of it. The Triage Profile says what it is, how urgent it is, and who to call.