Is there any active leak, water near electrical panels/outlets, or signs of a burst pipe?

Where is the low pressure showing up?

Have neighbors reported low pressure, or has the utility done recent main work?

A utility-side problem is not a DIY fix.

Do you have a pressure-reducing valve (PRV) where the main enters the house, and can you read a gauge at a hose bibb?

Normal residential static pressure is 45-75 psi. Below 40 psi = low.

How old is the main service line, and do you know the material?

Galvanized steel corrodes shut from the inside over decades.

plumbing troubleshooting

Fix low water pressure

Common symptoms: low water pressure; weak flow whole house; slow shower; low pressure all fixtures; trickle from tap

Stop and call a pro if:

well-pump troubleshooting requires electrical safety
do not adjust gas water heater controls

Step-by-step diagnostic flow

Step 1
Is there any active leak, water near electrical panels/outlets, or signs of a burst pipe?
Step 2
Where is the low pressure showing up?
Step 3
Have neighbors reported low pressure, or has the utility done recent main work?
A utility-side problem is not a DIY fix.
Step 4
Do you have a pressure-reducing valve (PRV) where the main enters the house, and can you read a gauge at a hose bibb?
Normal residential static pressure is 45-75 psi. Below 40 psi = low.
Step 5
How old is the main service line, and do you know the material?
Galvanized steel corrodes shut from the inside over decades.

Possible outcomes

Stop and address the hazard first

high confidence

Active leak or water near electrical must be resolved before troubleshooting pressure.

Safe next steps

Shut off water at the main
Kill power to affected circuits at the breaker
Call a plumber if leak is not obvious

Active leak or electrical hazard

Single-fixture issue — use the fixture pressure workflow

high confidence

Whole-house diagnostics do not apply when only one fixture is affected.

Safe next steps

Open the 'Fix water pressure at a fixture' workflow
Check the aerator and angle stop at that fixture

Likely a utility-side problem

high confidence

Neighbor reports or known main work points to the service side, not your plumbing.

Safe next steps

Call your water utility and report low pressure
Ask whether crews are flushing or repairing nearby mains

Problem is upstream of your meter

Pressure at the bibb is fine — restriction is inside the house

medium confidence

Adequate static pressure at the outdoor bibb means a partially closed valve, clogged whole-house filter, or scaled section is restricting flow inside.

Safe next steps

Verify the main shutoff and any branch valves are fully open
Replace any whole-house sediment filter cartridge
Note which fixtures are worst

What to document for a pro

Static pressure reading at hose bibb
List of affected fixtures
Age and type of any whole-house filter

Likely galvanized service line corrosion

medium confidence

Old galvanized pipe restricts internal diameter over time and is not a DIY repair.

Safe next steps

Get quotes for a service-line replacement (copper or PEX)
Confirm material with a plumber before scheduling

What to document for a pro

Approximate age of service line
Static pressure reading
Whether issue is worse at upper floors

Service-line replacement is not DIY

Likely failing PRV or upstream restriction — call a pro

low confidence

Low static pressure without a clear utility cause typically means a failed PRV, a partially closed curb stop, or a service-line restriction.

Safe next steps

Photograph the area where the main enters the house including any PRV
Note the lowest pressure reading you measured

What to document for a pro

Static pressure reading
Whether a PRV is present
Service-line material and age if known

Diagnostic guidance only. If unsure, stop and call a licensed professional — gas, electrical, and refrigerant work is hazardous to untrained users.

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