Chloramine + Lead Pipes + Fluoride = Contaminated tap water (link is external)

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The lead pollution crisis of the Washington, D.C. water supply - and the culprit that caused it, the water disinfection chemical chloramine - is a powerful example of how things can go terribly wrong when water quality problems are considered and tackled in isolation.

Earlier this year, Virginia Polytechnic Institute and State University (Virginia Tech) scientists reported the shockingly high lead levels in the blood of young Washington, D.C. children tested between 2001 and 2004, when the District of Columbia's drinking water was being contaminated with lead from aging pipes.