Why Is My Water Pressure Low? How to Troubleshoot (and When to Call a Plumber)
- Checkered Flag Plumbing
- Apr 9
- 3 min read
Low water pressure can be more than just an inconvenience — it can signal bigger plumbing issues if left unchecked. Whether you’re dealing with a trickling shower, a slow-filling washing machine, or a kitchen faucet that seems to have lost its strength, it’s important to understand why it’s happening and how to address it.
Here’s a quick guide on common causes of low water pressure, simple troubleshooting tips you can try yourself, and when it’s time to call a professional plumber.
Common Causes of Low Water Pressure
1. Clogged Pipes or Fixtures
Mineral buildup from hard water can clog aerators on faucets or even narrow your pipes over time, restricting water flow.
2. Leaks in the Plumbing System
If there’s a hidden leak somewhere in your pipes, less water will make it to your faucets. Leaks also waste water and can cause structural damage to your home.
3. Faulty Pressure Regulator
Some homes are equipped with a pressure regulator to keep water pressure at a safe level. If it fails, it can cause pressure to become either too high or too low.
4. Corroded Pipes
Older homes with galvanized steel piping are particularly prone to corrosion, which can block water flow and reduce pressure.
5. Issues with the Main Water Supply
Sometimes the problem isn’t inside your home. Municipal water supply issues, like a broken main or maintenance work, can temporarily lower your pressure.
6. Valve Problems
If the main shut-off valve or the water meter valve isn’t fully open, it can restrict water flow throughout the house.
How to Troubleshoot Low Water Pressure
Step 1: Check Individual Fixtures
If it’s just one faucet or shower head, the problem is likely localized. Unscrew the aerator and clean out any debris or mineral buildup. For showers, soak the head in vinegar overnight to dissolve blockages.
Step 2: Look for Visible Leaks
Inspect around sinks, toilets, and exposed pipes for any signs of leaking water. Also, check for damp spots on walls, ceilings, or floors.
Step 3: Test the Water Pressure
You can pick up an inexpensive water pressure gauge at a hardware store. Attach it to an outdoor faucet and turn on the water fully. Normal residential water pressure is usually between 40–60 psi. Anything significantly lower could point to a bigger problem.
Step 4: Inspect the Main Shut-Off Valve
Locate your main water valve (often near where the water line enters your house) and make sure it’s fully open. Sometimes it gets partially closed during repairs or maintenance and never fully reopened.
Step 5: Check with Your Neighbors
If your neighbors are also experiencing low pressure, it’s likely a city-wide issue. Contact your local water provider to report the problem.
When to Call a Plumber
While some low water pressure issues are easy fixes, others require the tools, experience, and training of a professional plumber. Here’s when it’s best to call in the experts:
You can’t find the cause of the problem.
You suspect a leak inside your walls, floors, or foundation.
You notice water discoloration (could indicate pipe corrosion).
The pressure regulator needs replacement.
Pipe replacement may be necessary due to corrosion or buildup.
At Checkered Flag Plumbing Co., we specialize in quickly diagnosing and fixing water pressure problems, whether it’s a simple repair or a full system inspection. Don’t let low water pressure slow down your day — contact us today to schedule an appointment!
Need help fast?
📞 Call Checkered Flag Plumbing Co. at 704.942.1930 or Schedule Service Online!
Comments