Fixing high water pressure in your house requires adjusting or replacing your pressure reducing valve (PRV). Step 1: Screw a water pressure test gauge onto an outdoor hose bib to confirm your exact high PSI reading. Step 2: Locate the PRV near your main water shut-off valve. Step 3: Loosen the locking nut on top of the PRV adjustment stem using a wrench. Step 4: Turn the adjustment bolt counterclockwise to lower the pressure setting. Verification: Check the outdoor pressure gauge again to ensure the PSI reading has dropped successfully into the safe 50 to 60 range.
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