Why Is My Water Pressure So Low? Causes & Fixes for Every Situation
Low water pressure is one of the most frustrating household issues.
Weak showers. Slow faucets. Washing machines that take forever.
And the worst part? Sometimes it starts randomly — even if nothing changed in your house.
This guide breaks down every common cause of low water pressure and shows you exactly how to fix it.
What Is Considered “Low” Water Pressure?
Most homes should have water pressure between 40–60 PSI.
If you’re experiencing:
- Weak shower flow
- Faucets barely running
- Appliances taking forever to fill
- Toilets taking longer to refill
You’re likely below the normal range.
Step 1: Check If It’s Just One Faucet or the Whole House
This is critical.
If it’s only one faucet:
The problem is usually local (clog, aerator, valve).
If it’s the whole house:
The issue may be with your main supply, regulator, or plumbing system.
Cause #1: Clogged Faucet Aerators
Over time, mineral deposits and debris buildup block your faucet’s aerator.
How to Fix It:
- Unscrew the aerator with pliers or by hand.
- Soak it in white vinegar for 1–2 hours.
- Scrub with an old toothbrush.
- Rinse and reinstall.
This alone fixes many pressure problems.
Cause #2: Partially Closed Valves
Sometimes your main shut-off or supply valves aren’t fully opened.
Check:
- Main water shutoff valve
- Water heater input valve
- Individual fixture shutoffs
Turn them all counterclockwise fully open.
Cause #3: Pressure Regulator Failure
Most homes have a pressure reducing valve (PRV) near where water enters the house.
When it fails, pressure drops.
Signs:
- Sudden permanent pressure drop
- Pressure fluctuates
- Weak flow everywhere
This often requires replacement by a plumber.
Cause #4: Leaks in the Plumbing System
Leaks reduce pressure by diverting water.
Look for:
- Water stains on ceilings/walls
- Unexpected spikes in your water bill
- Damp cabinets or flooring
If you suspect a leak inside walls — call a plumber immediately.
Cause #5: Mineral Build-Up in Pipes
Hard water causes mineral deposits that narrow your pipes.
Solution options:
- Vinegar flushing (temporary)
- Descaling services
- Pipe replacement (extreme cases)
Cause #6: City Water Supply Issues
Sometimes the problem isn’t your house.
This happens due to:
- City maintenance
- Nearby construction
- Main line damage
Check with neighbors or your water utility if pressure suddenly changed.
How To Increase Water Pressure Safely
✅ Clean all aerators
✅ Fully open valves
✅ Replace old showerheads
✅ Install a water pressure booster pump
✅ Add a whole-house filter or softener
FAQ Section
Why is my shower weak but kitchen sink strong?
Likely a clogged showerhead or mineral buildup.
Is low water pressure dangerous?
It’s not dangerous but may indicate hidden leaks.
Can I increase water pressure myself?
Yes — in many cases, with simple fixes or a booster pump.