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Dick, R. J.; Wray, J. A.; Johnston, H. N. (1973), "A Literature and Technology Search on the Bacteriostatic and Sanitizing Properties of Copper and Copper Alloy Surfaces", Phase 1 Final Report, INCRA Project No. 212, June 29, 1973, contracted to Battelle Columbus Laboratories, Columbus, Ohio...

The amount of copper it would take for the ppm to reach a toxic level is staggering. There is no way it would happen with just a piece of pure copper in the water. That would be like believing cooking on cast iron will cause you to have too much iron in your diet...a myth that has been disproven...