I actually work at a water plant, so I can run any test my municipality would. Granted, my lab is far from being Federally certified, but I can still get somewhat accurate numbers. There is a state mandated copper test that is run annually, but the sample is collected after 6 hours of contact with copper piping (homeowners are asked not to use their faucets for 6 hours). This test is given to a certified lab, but only represents the worst case scenario being stale in the copper pipes, I use my sink a lot, so my copper would be considerably lower.
With that being said, the copper in my tap water (When I run the test) is around .05 mg/L usually.
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