A potable well will not be allowed to be cross-connected with the water supply from MUD under which condition?

A potable well cannot be cross-connected with the water supply from a Municipal Utility District (MUD) if it is used as an emergency backup because this scenario introduces potential contamination risks. Emergency backup systems are typically designed for situations when regular supply is disrupted. If a cross-connection exists, the risk of backflow increases during fluctuations in pressure, potentially allowing contaminants from the well into the MUD water supply.

Under existing regulations, potable wells must meet strict standards to maintain water quality and protect public health. While health department approval and backflow prevention can help mitigate risks in other circumstances, the nature of an emergency backup system inherently complicates the oversight and assurance required to ensure safety, thereby precluding the possibility of cross-connection.