The higher the water source is above the ground, the more pressure it creates when you turn on a tap. Water pressure is usually measured in pounds per square inch, or PSI. Most homes have water pressure between forty and sixty PSI. If the pressure is too low, washing dishes or taking a shower becomes a challenge. If the pressure is too high, it can wear out pipes or cause leaks. Some houses have pressure regulators that help control how strong the water flow is.

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