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Water Pressure | 5 min read

Low Water Pressure: 7 Causes and How to Fix Them

Clogged aerators, scale, a partly closed valve, a bad regulator, hidden leaks and old pipes can all lower pressure.

By The Plumbing Co Team | Updated November 1, 2026
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Low Water Pressure: 7 Causes and How to Fix Them
Quick answer: Clogged aerators, scale, a partly closed valve, a bad regulator, hidden leaks and old pipes can all lower pressure.

Weak showers and slow taps are frustrating. Here are seven common causes.

1. Clogged aerator or showerhead Scale blocks tiny holes. Soak parts in vinegar.

2. A partly closed valve Check the main valve and fixture valves.

3. Bad pressure regulator A failing pressure regulator can drop pressure for the whole house.

4. Mineral buildup in pipes Hard water scale narrows pipes over time.

5. A hidden leak Water escapes before it reaches your taps. See leak detection.

6. Old galvanized pipes Rust builds inside the pipe. Repiping can fix it.

7. Water supply problems Sometimes the issue is outside your home. Ask neighbors if they have it too.

How to test A pressure gauge on an outside hose bib shows your PSI. Many homes do well between 50 and 70 PSI.

Get help If only one faucet is weak, it is likely a local clog. If the whole house is weak, call us. We offer low water pressure fixes, and we install valves from Watts and faucets from Moen and Grohe.

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Common Questions: Low Water Pressure: 7 Causes and How to Fix Them

What is good water pressure?

Most homes do well between 50 and 70 PSI.

Why is only one faucet weak?

The aerator or cartridge is likely clogged.

Can hard water cause low pressure?

Yes. Scale narrows pipes and clogs fixtures.

Can too much pressure be a problem?

Yes. High pressure strains pipes and fixtures.

Can a leak lower pressure?

Yes. Water escapes before it reaches your taps.

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