At what distribution pressure (psi) must special precautions be instituted?

Special precautions must be instituted at a distribution pressure of 20 psi due to the potential risks associated with lower pressure levels in a water distribution system. At this threshold, the integrity of the system becomes more critical as below this pressure, there can be a higher risk of contamination entering the water supply. Additionally, lower pressures might not effectively ensure adequate service to all users, especially in areas that are at the fringes of the distribution network. Precautionary measures might include increased monitoring for leakage and cross-connection control, as these conditions create vulnerabilities that could impact water quality and distribution reliability.

In contrast, pressures below this level do not trigger the same level of concern regarding contamination and service reliability, making 20 psi a significant point for implementing additional safety measures.