What size of pipe is typically used to feed a fire hydrant on private property?

Fire hydrants on private property are typically supplied with a 6-inch pipe. This size is common because it balances the need for adequate water flow to the hydrant while remaining manageable in terms of installation and cost. The 6-inch pipe allows for sufficient water pressure and volume necessary to extinguish fires effectively, while also ensuring that the connection to the municipal water supply or any private water system remains efficient.

Using a larger pipe, such as an 8-inch or 10-inch, might provide more flow, but it is usually not necessary for the intended use of a standard hydrant. Furthermore, a 4-inch pipe might not meet the required flow rates needed in a fire emergency situation. Therefore, the 6-inch size is the standard recommendation for feeding fire hydrants, as it provides a good compromise between capacity and practicality.