Response to The Uniform Plumbing Code (UPC) calls for water to be delivered to US homes for domestic use at between 35 and 80 pounds per square inch (psi). That varies depending on your water source. Most city water systems produce between 40psi and 70psi of pressure. Houses that have their own well are likely set around 40psi. 50-60 psi is the average household range.The 2009 IRC states "P2903.3 Minimum pressure.

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