Why Is My Faucet Water Pressure Low?

Understand the job

Low flow at one faucet is often caused by a clogged aerator, supply restriction or valve issue. Whole-house pressure problems require a different diagnosis.

What to inspect first

Compare hot and cold flow and test other fixtures. Check whether the issue started suddenly or gradually and whether recent plumbing work occurred.

Step-by-step approach

Clean the aerator, verify accessible shutoff valves are fully open and inspect exposed supply lines for kinks.

Common warning signs

Sudden whole-house pressure loss, banging pipes, a leaking pressure regulator or buried service-line concerns need professional evaluation.

Final checks

After cleaning or repair, compare flow again and check disturbed connections for leaks.

Tools and materials to plan for

The exact list depends on the product and site. Plan for accurate measuring tools, suitable personal protection, manufacturer-approved fasteners or fittings, cleanup supplies and a reliable way to verify the finished work.

Common mistakes to avoid

• Replacing parts before identifying the cause
• Skipping measurements or manufacturer instructions
• Using fasteners, sealants or materials not rated for the application
• Closing the repair before checking for hidden damage
• Failing to test the completed work before calling it finished

Should you DIY or hire help?

Straightforward inspection and maintenance may be reasonable for a careful homeowner. Hire qualified help when access is difficult, the repair crosses multiple trades, permits or licensing may apply, structural or electrical conditions are involved, or the problem keeps returning after a basic repair.