What is the minimum size for a potable water service pipe in single-family dwellings as per the UPC?

The minimum size for a potable water service pipe in single-family dwellings according to the Uniform Plumbing Code (UPC) is 3/4 inch. This size is specified to ensure adequate water flow and pressure for typical household needs. A 3/4-inch pipe can efficiently deliver sufficient water supply for various fixtures in a single-family home, accommodating simultaneous use of multiple fixtures without significant pressure loss.

Using a smaller diameter, such as 1/2 inch, might restrict water flow, particularly during peak usage times when multiple appliances or faucets are in use, leading to inadequate service. Similarly, larger sizes, while they would provide adequate flow, could be unnecessary and more costly, as they might cause extra expenses related to material and installation without corresponding benefits for typical household consumption patterns. Hence, the 3/4-inch pipe stands as the most balanced choice for ensuring reliability in the water service for single-family homes as outlined by the UPC.