Before revision: California allowed the use of PEX for domestic water systems on a case-by-case basis only in 2007.2007 CPC Table 6-4 Footnote 1; previously: 2001 CPC 604.1 #2 This was mostly due to concerns about corrosion of the manifolds (rather than the tubing itself) and was allowed to be used in California for hydronic radiant heating systems but not potable water.
After revision: California allowed the use of PEX for domestic water systems on a case-by-case basis only in 2007.2007 CPC Table 6-4 Footnote 1; previously: 2001 CPC 604.1 #2 This was due mostly to concerns about corrosion of the manifolds (rather than the tubing itself) and California allowed PEX to be used for hydronic radiant heating systems but not potable water.