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I asked neighbors and they don't notice it. I tested my outdoor hose bib which is right after my meter, and it was clear. Toilet tanks I see some black particles but it appears it is the rubber bolt washers that have deteriorated over time.

I have been having the same problems as described above where black spots are noticeable in a bathtub. It started out as tiny smeared specks only noticeable after the water was drained, but now I see slightly larger rubbery pieces. I believe I have read all threads on the internet discussing...