The copper level in most water systems isn't high enough to cause most people, problems.
The sure way to guarantee it's not present is to use RO water or a copper adsorbing compound such as Poly BioMarine's Poly Filter.
Presuming the color on your photo is accurate, you don't have enough, or any, to worry about. Worry about other issues such as mineralization.
I am sooo happy right now! I just bought a 75 gallon tank brand new for a hundred bucks! And once I test drive one ghost shrimp, and determine the toxicity, gonna buy 20 rcs's for the 30 breeder.
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