Lead levels in drinking water spike when copper and lead pipes joined: Levels linked to galvanic corrosion, disinfectants, pH

Lead pipes once used routinely in municipal water distribution systems are a well-recognized source of dangerous lead contamination, but new research suggests that the partial replacement of these pipes can make the problem worse. The research shows that joining old lead pipes with new copper lines using brass fittings spurs galvanic corrosion that can dramatically increase the amount of lead released into drinking water supplies.

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