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I’m sorry if this is inappropriate to ask so specifically for San Francisco dwellers, but I couldn’t find the answer this online. Does anyone know if PEX plumbing is allowed for water piping solutions?

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Looks like San Francisco uses an amended version of the 2015 Uniform Plumbing Code (UPC). So as long as the PEX conforms to NSF 61 and has the marking "NSF-61" or "NSF pw", it should be allowed. A quick call to the San Francisco building department, should provide a definitive answer.

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