Yes, a residential water pressure of 90 PSI is definitely bad and violates standard building codes, which mandate that home water pressure must not exceed 80 PSI. Operating at 90 PSI places extreme, continuous mechanical stress on your water heater tank, appliance supply hoses, washing machine inlet valves, toilet fill valves, and faucet cartridge seals. This relentless stress drastically increases the risk of sudden pipe joint leaks, pinhole leaks, and catastrophic indoor flooding. Verification: Use a pressure test gauge and adjust your PRV immediately to lower the pressure to a safer 50 to 60 PSI.
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