Turn off all water-using fixtures and appliances in the house
Attach a water pressure gauge to an outdoor hose bib or laundry faucet
Make sure the faucet is fully closed before attaching the gauge
Open the faucet fully to let water flow into the gauge
Read the pressure on the gauge in pounds per square inch
Check the reading against the typical home water pressure range of 40 to 80 psi
Test more than one faucet if you want to compare pressure in different areas
Repeat the test at different times of day if pressure seems inconsistent
Contact a plumber if the pressure is too high, too low, or fluctuates a lot