The water pressure of household plumbing fixtures will generally vary between 20 pounds per square inch (PSI) and 125 PSI. The pressure of a plumbing fixture will depend on the type of fixture, such as a faucet or shower head, and the product specifications.
Some plumbing fixtures will have specific water pressure settings indicated by the manufacturer, and some will not. Most fixtures will operate below 80 PSI, but faucets can operate at a wider range of pressure, up to a maximum of 125 PSI. The minimum and maximum pressure level of plumbing fixtures is determined by the American Society of Mechanical Engineers (ASME).