Uponor PEX- is this normal?

[Embrace the Technology]

Hi everyone. I’m wondering if this is normal for Uponor clear PEX. This is two year old pipe in a two year old house. There’s obvious yellow spots on this cold water line that’s under a sink and doesn’t get any U.V. The lines in the attic are also yellow instead of white after only two years. The water heater is set to 120 and has no recirculating system. It’s in Phoenix AZ so the attic where all the pipes run gets above 140 degrees in the summer. The water pressure is 80psi. Wondering if I should be concerned or if any professional plumbers repair leaks on this often.

 

[HighqualityPlumbing]

I have the same question. On top of what you are describing, my uninstalled pipe that was stored in a dark corner of the garage with window blinds (indirect light of perhaps 5% of normally lit room) got yellow spots and overall yellowed after only a few months.