I have designed and am working to get a gray water system permitted in Petaluma, CA.
I have been informed by the City that, even though there are no proposed connections with city potable water, the property must have a reduced pressure backflow prevention device installed (about $1,000 for the client) because of the potential for cross-connection with gray water.
There is no mention of this in the California Plumbing Code that I can see. There is a city code that justifies this requirement, and it seems to be a fairly common city code. This seems to apply to rain water systems as well as gray water.
- Has anyone else run into this?
- Has anyone found a way of getting around this if they have?
- Does anyone with public health expertise think this code should be changed to only require backflow prevention with actual connections to potable water?
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