New State Regulations on Cross Connection and Backflow Prevention

(Posted November 18, 2024) What is a “cross-connection” and a “backflow” and why does it matter? A cross-connection is an actual or potential connection between the District’s potable water distribution system and a customer’s property where there is another liquid, gas or an auxiliary water supply (such as a well or unpermitted water source). Backflow is the undesired or unintended reversal of flow of water or other liquids, gas or other substances from a customer’s property into the District’s water distribution system. Controlling and preventing a cross-connection or a backflow is a public health priority that the North Marin Water District is tasked with upholding as part of our delivery of water to your house or business. Regulations that govern these standards of protection date as far back as 1924 and recently the state of California mandated new rules for prevention. For more information on these requirements, including examples of “High Hazard Cross-connections” and what steps the District is taking, see a recent update to our Board: New State Guidelines for Cross-Connection Control

For more information on cross connection and backflow prevention click Here.