- (1) Unless otherwise specifically approved by the director, a water supplier may not allow any connection to the water system where the dynamic water pressure at the point of connection will fall below 20 psi during the normal operation of the water system. Each water system approved before January 1, 2007 is required to maintain the above minimum dynamic water pressure at each location within that water supplier's distribution system. An existing public drinking water system approved before January 1, 2007 which expands service into new areas or supplies new subdivisions shall meet the minimum dynamic water pressure requirements in Subsection R309-105-9(2) at any point of connection in the new service areas or new subdivisions.
(2) Unless otherwise specifically approved by the director, new public drinking water systems constructed after January 1, 2007 shall be designed and shall meet the following minimum water pressures at points of connection:
- (a) 20 psi during conditions of fire flow and fire demand experienced during peak day demand;
- (b) 30 psi during peak instantaneous demand; and
- (c) 40 psi during peak day demand.
KEY: drinking water, watershed management
Date of Last Change: March 2, 2026
Notice of Continuation: February 10, 2025
Authorizing, and Implemented or Interpreted Law: 19-4-104