There was considerable press a few years ago in the Carroll County MD area where home owners were experiencing this same problem in rather new developments. My recolection was that no final determinaton was made but several experts were of the opinion that it resulted from additives in the water supplied by the utility and the quality of copper pipe installed. If I remember correctly, some developments were impacted more severly than others although they were all using the same water. I believe there were comments about the utility removing some additives to the water supply in an effort to reduce the problem. Have not read any recent press on the subject. Bruce Carpenter
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